[apops] Cisco Security Advisory: Cisco IOS Software IPv6 Denial of Servi

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  • Subject: [apops] Cisco Security Advisory: Cisco IOS Software IPv6 Denial of Service Vulnerability
  • From: Cisco Systems Product Security Incident Response Team <psirt at cisco dot com>
  • Date: Wed, 28 Sep 2011 12:00:00 -0400
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      Cisco Security Advisory: Cisco IOS Software IPv6 Denial of Service
      Vulnerability
      
      Advisory ID: cisco-sa-20110928-ipv6
      
      Revision 1.0
      
      For Public Release 2011 September 28 1600 UTC (GMT)
      
      +--------------------------------------------------------------------
      
      Summary
      =======
      
      Cisco IOS Software contains a vulnerability in the IP version 6
      (IPv6) protocol stack implementation that could allow an
      unauthenticated, remote attacker to cause a reload of an affected
      device that has IPv6 enabled. The vulnerability may be triggered when
      the device processes a malformed IPv6 packet.
      
      Cisco has released free software updates that address this
      vulnerability. There are no workarounds to mitigate this
      vulnerability.
      
      This advisory is posted at
      http://www.cisco.com/warp/public/707/cisco-sa-20110928-ipv6.shtml.
      
      Note: The September 28, 2011, Cisco IOS Software Security Advisory
      bundled publication includes ten Cisco Security Advisories. Nine of the
      advisories address vulnerabilities in Cisco IOS Software, and one
      advisory addresses a vulnerability in Cisco Unified Communications
      Manager. Each advisory lists the Cisco IOS Software releases that
      correct the vulnerability or vulnerabilities detailed in the advisory as
      well as the Cisco IOS Software releases that correct all vulnerabilities
      in the September 2011 Bundled Publication.
      
      Individual publication links are in "Cisco Event Response: Semiannual
      Cisco IOS Software Security Advisory Bundled Publication" at the
      following link:
      
      http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep11.html
      
      Affected Products
      =================
      
      This vulnerability affects devices that are running Cisco IOS
      Software and configured for IPv6 operation. IPv6 is not enabled by
      default in Cisco IOS Software.
      
      Vulnerable Products
      +------------------
      
      Cisco devices that are running an affected version of Cisco IOS
      Software and configured for IPv6 operation are vulnerable. A device
      that is running Cisco IOS Software and that has IPv6 enabled will
      show some interfaces with assigned IPv6 addresses when the "show ipv6
      interface brief" command is executed.
      
      The "show ipv6 interface brief" command will produce an error message
      if the version of Cisco IOS Software in use does not support IPv6, or
      will not show any interfaces with IPv6 address if IPv6 is disabled.
      The system is not vulnerable in these scenarios.
      
      Sample output of the "show ipv6 interface brief" command on a system
      that is configured for IPv6 operation follows:
      
          router>show ipv6 interface brief
          FastEthernet0/0            [up/up]
              FE80::222:90FF:FEB0:1098
              2001:DB8:2:93::3
              200A:1::1
          FastEthernet0/1            [up/up]
              FE80::222:90FF:FEB0:1099
              2001:DB8:2:94::1
          Serial0/0/0                [down/down]
              unassigned
          Serial0/0/0.4              [down/down]
              unassigned
          Serial0/0/0.5              [down/down]
              unassigned
          Serial0/0/0.6              [down/down]
              unassigned
      
      Alternatively, the IPv6 protocol is enabled if the interface
      configuration command "ipv6 address <IPv6 address>" or "ipv6 enable"
      is present in the configuration. Both may be present, as shown in the
      vulnerable configuration in the following example shows:
      
          interface FastEthernet0/1
           ipv6 address 2001:0DB8:C18:1::/64 eui-64
          !
          interface FastEthernet0/2
           ipv6 enable
      
      A device that is running Cisco IOS Software and that has IPv6 enabled
      on a physical or logical interface is vulnerable even if ipv6
      unicast-routing is globally disabled (that is, the device is not
      routing IPv6 packets).
      
      To determine the Cisco IOS Software release that is running on a Cisco
      product, administrators can log in to the device and issue the "show
      version" command to display the system banner. The system banner
      confirms that the device is running Cisco IOS Software by displaying
      text similar to "Cisco Internetwork Operating System Software" or "Cisco
      IOS Software." The image name displays in parentheses, followed by
      "Version" and the Cisco IOS Software release name. Other Cisco devices
      do not have the "show version" command or may provide different output.
      
      The following example identifies a Cisco product that is running
      Cisco IOS Software Release 15.0(1)M1 with an installed image name of
      C3900-UNIVERSALK9-M:
      
          Router> show version
          Cisco IOS Software, C3900 Software (C3900-UNIVERSALK9-M), Version 15.0(1)M1, RELEASE SOFTWARE (fc1)
          Technical Support: http://www.cisco.com/techsupport
          Copyright (c) 1986-2009 by Cisco Systems, Inc.
          Compiled Wed 02-Dec-09 17:17 by prod_rel_team
      
          !--- output truncated
      
      Additional information about Cisco IOS Software release
      naming conventions is available in the white paper Cisco
      IOS and NX-OS Software Reference Guide available at
      http://www.cisco.com/web/about/security/intelligence/ios-ref.html.
      
      Products Confirmed Not Vulnerable
      +--------------------------------
      
      Cisco IOS XR Software and Cisco IOS XE Software are not affected by
      this vulnerability.
      
      No other Cisco products are currently known to be affected by this
      vulnerability.
      
      Details
      =======
      
      IPv6, which was designed by the Internet Engineering Task Force
      (IETF), is intended to replace the current version, IP Version 4
      (IPv4).
      
      A vulnerability exists when Cisco IOS Software processes IPv6
      packets. An attacker could exploit this vulnerability by sending
      malformed IPv6 packets to physical or logical interfaces that are
      configured to process IPv6 traffic. Transit traffic cannot trigger
      this vulnerability. Exploitation could cause an affected system to
      reload.
      
      This vulnerability is documented in Cisco bug ID CSCtj41194, and
      has been assigned Common Vulnerabilities and Exposures (CVE) ID
      CVE-2011-0944.
      
      Vulnerability Scoring Details
      =============================
      
      Cisco has provided scores for the vulnerability in this advisory
      based on the Common Vulnerability Scoring System (CVSS). The CVSS
      scoring in this Security Advisory is done in accordance with CVSS
      version 2.0.
      
      CVSS is a standards-based scoring method that conveys vulnerability
      severity and helps determine urgency and priority of response.
      
      Cisco has provided a base and temporal score. Customers can then
      compute environmental scores to assist in determining the impact of
      the vulnerability in individual networks.
      
      Cisco has provided an FAQ to answer additional questions regarding
      CVSS at:
      
      http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html
      
      Cisco has also provided a CVSS calculator to help compute the
      environmental impact for individual networks at:
      
      http://intellishield.cisco.com/security/alertmanager/cvss
      
      
      * CSCtj41194 ("Crafted IPv6 packet causes device reload")
      
      CVSS Base Score - 7.8
          Access Vector -            Network
          Access Complexity -        Low
          Authentication -           None
          Confidentiality Impact -   None
          Integrity Impact -         None
          Availability Impact -      Complete
      
      CVSS Temporal Score - 6.4
          Exploitability -           Functional
          Remediation Level -        Official-Fix
          Report Confidence -        Confirmed
      
      
      Impact
      ======
      
      Successful exploitation of the vulnerability that is described in
      this advisory may cause a reload of an affected device. Repeated
      exploitation could result in a sustained denial of service condition.
      
      Software Versions and Fixes
      ===========================
      
      When considering software upgrades, also consult
      http://www.cisco.com/go/psirt and any subsequent advisories to determine
      exposure and a complete upgrade solution.
      
      In all cases, customers should exercise caution to be certain the
      devices to be upgraded contain sufficient memory and that current
      hardware and software configurations will continue to be supported
      properly by the new release. If the information is not clear, contact
      the Cisco Technical Assistance Center (TAC) or your contracted
      maintenance provider for assistance.
      
      Additionally, the Cisco IOS Software Checker is available on
      the Cisco Security Intelligence Operations (SIO) portal at
      http://tools.cisco.com/security/center/selectIOSVersion.x. It provides
      several features for checking which Security Advisories affect specified
      versions of Cisco IOS Software.
      
      Cisco IOS Software
      +-----------------
      
      Each row of the following Cisco IOS Software table corresponds to a
      Cisco IOS Software train. If a particular train is vulnerable, the
      earliest releases that contain the fix are listed in the First Fixed
      Release For This Advisory column. The First Fixed Release for All
      Advisories in the September 2011 Bundled Publication column lists the
      earliest possible releases that correct all the published
      vulnerabilities in the Cisco IOS Software Security Advisory bundled
      publication. Cisco recommends upgrading to the latest available
      release, where possible.
      
      +------------------------------------------------------------+
      |   Major    |         Availability of Repaired Releases     |
      |  Release   |                                               |
      |------------+-----------------------------------------------|
      |  Affected  |                    | First Fixed Release for  |
      | 12.0-Based |    First Fixed     |  All Advisories in the   |
      |  Releases  |      Release       |  September 2011 Bundled  |
      |            |                    |       Publication        |
      |------------------------------------------------------------|
      | There are no affected 12.0 based releases                  |
      |------------------------------------------------------------|
      |  Affected  |                    | First Fixed Release for  |
      | 12.1-Based |    First Fixed     |  All Advisories in the   |
      |  Releases  |      Release       |  September 2011 Bundled  |
      |            |                    |       Publication        |
      |------------+--------------------+--------------------------|
      | 12.1E      | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SXF       |
      |------------+--------------------+--------------------------|
      |  Affected  |                    | First Fixed Release for  |
      | 12.2-Based |    First Fixed     |  All Advisories in the   |
      |  Releases  |      Release       |  September 2011 Bundled  |
      |            |                    |       Publication        |
      |------------+--------------------+--------------------------|
      | 12.2       | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4          |
      |------------+--------------------+--------------------------|
      | 12.2B      | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4          |
      |------------+--------------------+--------------------------|
      | 12.2BC     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4          |
      |------------+--------------------+--------------------------|
      | 12.2BW     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2BX     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SB        |
      |------------+--------------------+--------------------------|
      | 12.2BY     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2BZ     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2CX     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4          |
      |------------+--------------------+--------------------------|
      | 12.2CY     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2CZ     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SB        |
      |------------+--------------------+--------------------------|
      | 12.2DA     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2DD     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2DX     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2EU     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      |            |                    | Releases up to and       |
      | 12.2EW     | Not vulnerable     | including 12.2(20)EW4    |
      |            |                    | are not vulnerable.      |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2EWA    | Not vulnerable     | the instructions in      |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      | 12.2EX     | Not vulnerable     | 12.2(55)EX3              |
      |------------+--------------------+--------------------------|
      | 12.2EY     | Not vulnerable     | 12.2(58)EY               |
      |------------+--------------------+--------------------------|
      | 12.2EZ     | Not vulnerable     | Vulnerable; migrate to   |
      |            |                    | any release in 15.0SE    |
      |------------+--------------------+--------------------------|
      | 12.2FX     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SE        |
      |------------+--------------------+--------------------------|
      | 12.2FY     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2EX        |
      |------------+--------------------+--------------------------|
      | 12.2FZ     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SE        |
      |------------+--------------------+--------------------------|
      | 12.2IRA    | Not vulnerable     | Vulnerable; migrate to   |
      |            |                    | any release in 12.2IRG   |
      |------------+--------------------+--------------------------|
      | 12.2IRB    | Not vulnerable     | Vulnerable; migrate to   |
      |            |                    | any release in 12.2IRG   |
      |------------+--------------------+--------------------------|
      | 12.2IRC    | Not vulnerable     | Vulnerable; migrate to   |
      |            |                    | any release in 12.2IRG   |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2IRD    | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2IRE    | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      | 12.2IRF    | Not vulnerable     | Vulnerable; migrate to   |
      |            |                    | any release in 12.2IRG   |
      |------------+--------------------+--------------------------|
      | 12.2IRG    | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2IXA    | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2IXB    | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2IXC    | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2IXD    | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2IXE    | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2IXF    | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2IXG    | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2IXH    | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      | 12.2JA     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2JK     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2MB     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2MC     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4          |
      |------------+--------------------+--------------------------|
      | 12.2MRA    | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SRD       |
      |------------+--------------------+--------------------------|
      | 12.2MRB    | Not vulnerable     | 12.2(33)MRB5             |
      |------------+--------------------+--------------------------|
      |            |                    | Releases prior to 12.2   |
      |            |                    | (30)S are vulnerable;    |
      | 12.2S      | Not vulnerable     | Releases 12.2(30)S and   |
      |            |                    | later are not            |
      |            |                    | vulnerable. First fixed  |
      |            |                    | in Release 12.2SB        |
      |------------+--------------------+--------------------------|
      | 12.2SB     | Not vulnerable     | 12.2(31)SB2012.2(33)SB10 |
      |------------+--------------------+--------------------------|
      | 12.2SBC    | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SB        |
      |------------+--------------------+--------------------------|
      | 12.2SCA    | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SCC       |
      |------------+--------------------+--------------------------|
      | 12.2SCB    | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SCC       |
      |------------+--------------------+--------------------------|
      | 12.2SCC    | Not vulnerable     | 12.2(33)SCC7             |
      |------------+--------------------+--------------------------|
      | 12.2SCD    | Not vulnerable     | 12.2(33)SCD6             |
      |------------+--------------------+--------------------------|
      | 12.2SCE    | Not vulnerable     | 12.2(33)SCE112.2(33)SCE2 |
      |------------+--------------------+--------------------------|
      | 12.2SCF    | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2SE     | Not vulnerable     | 12.2(55)SE312.2(58)SE    |
      |------------+--------------------+--------------------------|
      | 12.2SEA    | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SE        |
      |------------+--------------------+--------------------------|
      | 12.2SEB    | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SE        |
      |------------+--------------------+--------------------------|
      | 12.2SEC    | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SE        |
      |------------+--------------------+--------------------------|
      | 12.2SED    | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SE        |
      |------------+--------------------+--------------------------|
      | 12.2SEE    | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SE        |
      |------------+--------------------+--------------------------|
      | 12.2SEF    | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SE        |
      |------------+--------------------+--------------------------|
      |            |                    | Releases prior to 12.2   |
      |            |                    | (25)SEG4 are vulnerable; |
      | 12.2SEG    | Not vulnerable     | Releases 12.2(25)SEG4    |
      |            |                    | and later are not        |
      |            |                    | vulnerable. First fixed  |
      |            |                    | in Release 12.2EX        |
      |------------+--------------------+--------------------------|
      |            |                    | Releases prior to 12.2   |
      |            |                    | (53)SG4 are vulnerable;  |
      | 12.2SG     | Not vulnerable     | Releases 12.2(53)SG4 and |
      |            |                    | later are not            |
      |            |                    | vulnerable.              |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2SGA    | Not vulnerable     | the instructions in      |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      | 12.2SL     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2SM     | Not vulnerable     | the instructions in      |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      | 12.2SO     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2SQ     | Not vulnerable     | 12.2(50)SQ3              |
      |------------+--------------------+--------------------------|
      | 12.2SRA    | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SRD       |
      |------------+--------------------+--------------------------|
      | 12.2SRB    | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SRD       |
      |------------+--------------------+--------------------------|
      | 12.2SRC    | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SRD       |
      |------------+--------------------+--------------------------|
      | 12.2SRD    | Not vulnerable     | 12.2(33)SRD6             |
      |------------+--------------------+--------------------------|
      | 12.2SRE    | Not vulnerable     | 12.2(33)SRE4             |
      |------------+--------------------+--------------------------|
      | 12.2STE    | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2SU     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4          |
      |------------+--------------------+--------------------------|
      |            |                    | Releases prior to 12.2   |
      |            |                    | (29a)SV are vulnerable;  |
      | 12.2SV     | Not vulnerable     | Releases 12.2(29a)SV and |
      |            |                    | later are not            |
      |            |                    | vulnerable. Migrate to   |
      |            |                    | any release in 12.2SVD   |
      |------------+--------------------+--------------------------|
      | 12.2SVA    | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2SVC    | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2SVD    | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2SVE    | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2SW     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      | 12.2SX     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SXF       |
      |------------+--------------------+--------------------------|
      | 12.2SXA    | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SXF       |
      |------------+--------------------+--------------------------|
      | 12.2SXB    | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SXF       |
      |------------+--------------------+--------------------------|
      | 12.2SXD    | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SXF       |
      |------------+--------------------+--------------------------|
      | 12.2SXE    | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SXF       |
      |------------+--------------------+--------------------------|
      | 12.2SXF    | Not vulnerable     | 12.2(18)SXF17b           |
      |------------+--------------------+--------------------------|
      | 12.2SXH    | Not vulnerable     | 12.2(33)SXH8a            |
      |------------+--------------------+--------------------------|
      | 12.2SXI    | Not vulnerable     | 12.2(33)SXI6             |
      |------------+--------------------+--------------------------|
      | 12.2SXJ    | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2SY     | Not vulnerable     | 12.2(50)SY               |
      |------------+--------------------+--------------------------|
      | 12.2SZ     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SB        |
      |------------+--------------------+--------------------------|
      | 12.2T      | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4          |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2TPC    | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      | 12.2XA     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2XB     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4          |
      |------------+--------------------+--------------------------|
      | 12.2XC     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2XD     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2XE     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2XF     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2XG     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2XH     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2XI     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2XJ     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2XK     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2XL     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2XM     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2XN     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      |            | See Cisco IOS-XE   | See Cisco IOS-XE         |
      | 12.2XNA    | Software           | Software Availability    |
      |            | Availability       |                          |
      |------------+--------------------+--------------------------|
      |            | See Cisco IOS-XE   | See Cisco IOS-XE         |
      | 12.2XNB    | Software           | Software Availability    |
      |            | Availability       |                          |
      |------------+--------------------+--------------------------|
      |            | See Cisco IOS-XE   | See Cisco IOS-XE         |
      | 12.2XNC    | Software           | Software Availability    |
      |            | Availability       |                          |
      |------------+--------------------+--------------------------|
      |            | See Cisco IOS-XE   | See Cisco IOS-XE         |
      | 12.2XND    | Software           | Software Availability    |
      |            | Availability       |                          |
      |------------+--------------------+--------------------------|
      |            | See Cisco IOS-XE   | See Cisco IOS-XE         |
      | 12.2XNE    | Software           | Software Availability    |
      |            | Availability       |                          |
      |------------+--------------------+--------------------------|
      |            | See Cisco IOS-XE   | See Cisco IOS-XE         |
      | 12.2XNF    | Software           | Software Availability    |
      |            | Availability       |                          |
      |------------+--------------------+--------------------------|
      |            |                    | Releases prior to 12.2   |
      |            |                    | (54)XO are vulnerable;   |
      | 12.2XO     | Not vulnerable     | Releases 12.2(54)XO and  |
      |            |                    | later are not            |
      |            |                    | vulnerable.              |
      |------------+--------------------+--------------------------|
      | 12.2XQ     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2XR     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2XS     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2XT     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2XU     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2XV     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2XW     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2YA     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4          |
      |------------+--------------------+--------------------------|
      | 12.2YB     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2YC     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2YD     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2YE     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2YF     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2YG     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2YH     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2YJ     | Not vulnerable     | the instructions in      |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      | 12.2YK     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2YL     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      | 12.2YM     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4          |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2YN     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      | 12.2YO     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2YP     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2YQ     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2YR     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2YS     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2YT     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2YU     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2YV     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2YW     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2YX     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2YY     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2YZ     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      | 12.2ZA     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SXF       |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2ZB     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      | 12.2ZC     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2ZD     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2ZE     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4          |
      |------------+--------------------+--------------------------|
      | 12.2ZF     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4          |
      |------------+--------------------+--------------------------|
      | 12.2ZG     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2ZH     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4          |
      |------------+--------------------+--------------------------|
      | 12.2ZJ     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2ZL     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      | 12.2ZP     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.2ZU     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.2SXH       |
      |------------+--------------------+--------------------------|
      | 12.2ZX     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2ZY     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.2ZYA    | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |  Affected  |                    | First Fixed Release for  |
      | 12.3-Based |    First Fixed     |  All Advisories in the   |
      |  Releases  |      Release       |  September 2011 Bundled  |
      |            |                    |       Publication        |
      |------------------------------------------------------------|
      | There are no affected 12.3 based releases                  |
      |------------------------------------------------------------|
      |  Affected  |                    | First Fixed Release for  |
      | 12.4-Based |    First Fixed     |  All Advisories in the   |
      |  Releases  |      Release       |  September 2011 Bundled  |
      |            |                    |       Publication        |
      |------------+--------------------+--------------------------|
      | 12.4       | Not vulnerable     | 12.4(25f)                |
      |------------+--------------------+--------------------------|
      | 12.4GC     | 12.4(24)GC4        | 12.4(24)GC4              |
      |------------+--------------------+--------------------------|
      | 12.4JA     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.4JAX    | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.4JDA    | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.4JDC    | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.4JHA    | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.4JHB    | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.4JHC    | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.4JK     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.4JL     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.4JMA    | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.4JMB    | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; migrate to   |
      |            |                    | any release in 12.4JA    |
      | 12.4JX     | Not vulnerable     |                          |
      |            |                    | Releases up to and       |
      |            |                    | including 12.4(21a)JX    |
      |            |                    | are not vulnerable.      |
      |------------+--------------------+--------------------------|
      | 12.4JY     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.4MD     | Not vulnerable     | 12.4(24)MD6 on           |
      |            |                    | 28-Oct-2011              |
      |------------+--------------------+--------------------------|
      | 12.4MDA    | Not vulnerable     | 12.4(24)MDA7             |
      |------------+--------------------+--------------------------|
      | 12.4MDB    | Not vulnerable     | 12.4(24)MDB3             |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.4MR     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.4MRA    | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      | 12.4MRB    | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4T         |
      |------------+--------------------+--------------------------|
      | 12.4SW     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      |            | Only 12.4(24)T     |                          |
      |            | through 12.4(24)T4 | 12.4(24)T6               |
      | 12.4T      | are affected;      |                          |
      |            | first fixed in     | 12.4(15)T16              |
      |            | 12.4(24)T3c and    |                          |
      |            | 12.4(24)T5         |                          |
      |------------+--------------------+--------------------------|
      | 12.4XA     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4T         |
      |------------+--------------------+--------------------------|
      | 12.4XB     | Not vulnerable     | 12.4(2)XB12              |
      |------------+--------------------+--------------------------|
      | 12.4XC     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.4XD     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4T         |
      |------------+--------------------+--------------------------|
      | 12.4XE     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.4XF     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4T         |
      |------------+--------------------+--------------------------|
      | 12.4XG     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4T         |
      |------------+--------------------+--------------------------|
      | 12.4XJ     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.4XK     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.4XL     | Not vulnerable     | the instructions in      |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      | 12.4XM     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4T         |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.4XN     | Not vulnerable     | the instructions in      |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.4XP     | Not vulnerable     | the instructions in      |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      | 12.4XQ     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4T         |
      |------------+--------------------+--------------------------|
      | 12.4XR     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4T         |
      |------------+--------------------+--------------------------|
      | 12.4XT     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4T         |
      |------------+--------------------+--------------------------|
      | 12.4XV     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      | 12.4XW     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4T         |
      |------------+--------------------+--------------------------|
      | 12.4XY     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4T         |
      |------------+--------------------+--------------------------|
      | 12.4XZ     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4T         |
      |------------+--------------------+--------------------------|
      | 12.4YA     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 12.4T         |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.4YB     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.4YD     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; fixed in     |
      |            |                    | 12.4(22)YE6 on           |
      | 12.4YE     | Not vulnerable     | 30-Sept-2011; 12.4(24)   |
      |            |                    | YE7 available on         |
      |            |                    | 17-Oct-2011              |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 12.4YG     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |  Affected  |                    | First Fixed Release for  |
      | 15.0-Based |    First Fixed     |  All Advisories in the   |
      |  Releases  |      Release       |  September 2011 Bundled  |
      |            |                    |       Publication        |
      |------------+--------------------+--------------------------|
      | 15.0M      | 15.0(1)M5          | 15.0(1)M7                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 15.0MR     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 15.0MRA    | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            | Not vulnerable     | 15.0(1)S4                |
      |            |                    |                          |
      | 15.0S      | Cisco IOS XE       | Cisco IOS XE devices:    |
      |            | devices: see Cisco | see Cisco IOS-XE         |
      |            | IOS-XE Software    | Software Availability    |
      |            | Availability       |                          |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 15.0SA     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      | 15.0SE     | Not vulnerable     | Not vulnerable           |
      |------------+--------------------+--------------------------|
      |            | Cisco IOS XE       | Cisco IOS XE devices:    |
      | 15.0SG     | devices: see Cisco | see Cisco IOS-XE         |
      |            | IOS-XE Software    | Software Availability    |
      |            | Availability       |                          |
      |------------+--------------------+--------------------------|
      |            | Vulnerable; First  | Vulnerable; First fixed  |
      | 15.0XA     | fixed in Release   | in Release 15.1T         |
      |            | 15.1T              |                          |
      |------------+--------------------+--------------------------|
      |            | Cisco IOS XE       |                          |
      |            | devices: Please    | Cisco IOS XE devices:    |
      | 15.0XO     | see Cisco IOS-XE   | Please see Cisco IOS-XE  |
      |            | Software           | Software Availability    |
      |            | Availability       |                          |
      |------------+--------------------+--------------------------|
      |  Affected  |                    | First Fixed Release for  |
      | 15.1-Based |    First Fixed     |  All Advisories in the   |
      |  Releases  |      Release       |  September 2011 Bundled  |
      |            |                    |       Publication        |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 15.1EY     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      | 15.1GC     | Not vulnerable     | Vulnerable; First fixed  |
      |            |                    | in Release 15.1T         |
      |------------+--------------------+--------------------------|
      | 15.1M      | Not vulnerable     | 15.1(4)M2; Available on  |
      |            |                    | 30-SEP-11                |
      |------------+--------------------+--------------------------|
      |            |                    | Vulnerable; contact your |
      |            |                    | support organization per |
      | 15.1MR     | Not vulnerable     | the instructions in the  |
      |            |                    | Obtaining Fixed Software |
      |            |                    | section of this          |
      |            |                    | advisory.                |
      |------------+--------------------+--------------------------|
      |            | Not vulnerable     | 15.1(2)S2                |
      |            |                    |                          |
      |            | Cisco IOS XE       | 15.1(3)S                 |
      | 15.1S      | devices: See Cisco |                          |
      |            | IOS-XE Software    | Cisco IOS XE devices:    |
      |            | Availability       | See Cisco IOS-XE         |
      |            |                    | Software Availability    |
      |------------+--------------------+--------------------------|
      |            | 15.1(1)T3          |                          |
      |            |                    | 15.1(2)T4 15.1(1)T4 on   |
      | 15.1T      | 15.1(2)T3          | 8-Dec-2011               |
      |            |                    |                          |
      |            | 15.1(3)T1          |                          |
      |------------+--------------------+--------------------------|
      |            | Vulnerable; First  | Vulnerable; First fixed  |
      | 15.1XB     | fixed in Release   | in Release 15.1T         |
      |            | 15.1T              |                          |
      |------------+--------------------+--------------------------|
      |  Affected  |                    | First Fixed Release for  |
      | 15.2-Based |    First Fixed     |  All Advisories in the   |
      |  Releases  |      Release       |  September 2011 Bundled  |
      |            |                    |       Publication        |
      |------------------------------------------------------------|
      | There are no affected 15.2 based releases                  |
      +------------------------------------------------------------+
      
      Cisco IOS XE Software
      +--------------------
      
      +------------------------------------------------------------+
      |  Cisco   |   First    |    First Fixed Release for All     |
      |  IOS XE  |   Fixed    |  Advisories in the September 2011  |
      | Release  |  Release   |        Bundled Publication         |
      |----------+------------+------------------------------------|
      | 2.1.x    | Not        | Vulnerable; migrate to 3.3.2S or   |
      |          | vulnerable | later                              |
      |----------+------------+------------------------------------|
      | 2.2.x    | Not        | Vulnerable; migrate to 3.3.2S or   |
      |          | vulnerable | later                              |
      |----------+------------+------------------------------------|
      | 2.3.x    | Not        | Vulnerable; migrate to 3.3.2S or   |
      |          | vulnerable | later                              |
      |----------+------------+------------------------------------|
      | 2.4.x    | Not        | Vulnerable; migrate to 3.3.2S or   |
      |          | vulnerable | later                              |
      |----------+------------+------------------------------------|
      | 2.5.x    | Not        | Vulnerable; migrate to 3.3.2S or   |
      |          | vulnerable | later                              |
      |----------+------------+------------------------------------|
      | 2.6.x    | Not        | Vulnerable; migrate to 3.3.2S or   |
      |          | vulnerable | later                              |
      |----------+------------+------------------------------------|
      | 3.1.xS   | Not        | Vulnerable; migrate to 3.3.2S or   |
      |          | vulnerable | later                              |
      |----------+------------+------------------------------------|
      | 3.1.xSG  | Not        | Vulnerable; migrate to 3.2.0SG or  |
      |          | vulnerable | later                              |
      |----------+------------+------------------------------------|
      | 3.2.xS   | Not        | Vulnerable; migrate to 3.3.2S or   |
      |          | vulnerable | later                              |
      |----------+------------+------------------------------------|
      | 3.2.xSG  | Not        | Not vulnerable                     |
      |          | vulnerable |                                    |
      |----------+------------+------------------------------------|
      | 3.3.xS   | Not        | 3.3.2S                             |
      |          | vulnerable |                                    |
      |----------+------------+------------------------------------|
      | 3.4.xS   | Not        | Not vulnerable                     |
      |          | vulnerable |                                    |
      +------------------------------------------------------------+
      
      For mapping of Cisco IOS XE to Cisco IOS releases, please refer to
      the Cisco IOS XE 2 Release Notes, Cisco IOS XE 3S Release Notes, and
      Cisco IOS XE 3SG Release Notes.
      
      Cisco IOS XR Software
      +--------------------
      
      Cisco IOS XR Software is not affected by any of the vulnerabilities
      in the September 2011 bundled publication.
      
      Workarounds
      ===========
      
      There are no workarounds for this vulnerability if IPv6 configuration
      is required.
      
      Obtaining Fixed Software
      ========================
      
      Cisco has released free software updates that address this
      vulnerability. Prior to deploying software, customers should consult
      their maintenance provider or check the software for feature set
      compatibility and known issues specific to their environment.
      
      Customers may only install and expect support for the feature
      sets they have purchased. By installing, downloading, accessing
      or otherwise using such software upgrades, customers agree to be
      bound by the terms of Cisco's software license terms found at
      http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html,
      or as otherwise set forth at Cisco.com Downloads at
      http://www.cisco.com/public/sw-center/sw-usingswc.shtml.
      
      Do not contact psirt at cisco dot com or security-alert at cisco dot com for
      software upgrades.
      
      Customers with Service Contracts
      +-------------------------------
      
      Customers with contracts should obtain upgraded software through
      their regular update channels. For most customers, this means that
      upgrades should be obtained through the Software Center on Cisco's
      worldwide website at http://www.cisco.com.
      
      Customers using Third Party Support Organizations
      +------------------------------------------------
      
      Customers whose Cisco products are provided or maintained through
      prior or existing agreements with third-party support organizations,
      such as Cisco Partners, authorized resellers, or service providers
      should contact that support organization for guidance and assistance
      with the appropriate course of action in regards to this advisory.
      
      The effectiveness of any workaround or fix is dependent on specific
      customer situations, such as product mix, network topology, traffic
      behavior, and organizational mission. Due to the variety of affected
      products and releases, customers should consult with their service
      provider or support organization to ensure any applied workaround or
      fix is the most appropriate for use in the intended network before it
      is deployed.
      
      Customers without Service Contracts
      +----------------------------------
      
      Customers who purchase direct from Cisco but do not hold a Cisco
      service contract, and customers who purchase through third-party
      vendors but are unsuccessful in obtaining fixed software through
      their point of sale should acquire upgrades by contacting the Cisco
      Technical Assistance Center (TAC). TAC contacts are as follows.
      
        * +1 800 553 2447 (toll free from within North America)
        * +1 408 526 7209 (toll call from anywhere in the world)
        * e-mail: tac at cisco dot com
      
      Customers should have their product serial number available and be
      prepared to give the URL of this notice as evidence of entitlement to
      a free upgrade. Free upgrades for non-contract customers must be
      requested through the TAC.
      
      Refer to
      http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html
      for additional TAC contact information, including localized telephone
      numbers, and instructions and e-mail addresses for use in various
      languages.
      
      Exploitation and Public Announcements
      =====================================
      
      The Cisco PSIRT is not aware of any public announcements or malicious
      use of the vulnerability that is described in this advisory.
      
      This vulnerability was discovered by Cisco during internal testing.
      
      Status of this Notice: FINAL
      ============================
      
      THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY
      KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF
      MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE
      INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS
      AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS
      DOCUMENT AT ANY TIME.
      
      A stand-alone copy or Paraphrase of the text of this document that
      omits the distribution URL in the following section is an
      uncontrolled copy, and may lack important information or contain
      factual errors.
      
      Distribution
      ============
      
      This advisory is posted on Cisco's worldwide website at:
      
      http://www.cisco.com/warp/public/707/cisco-sa-20110928-ipv6.shtml
      
      In addition to worldwide web posting, a text version of this notice
      is clear-signed with the Cisco PSIRT PGP key and is posted to the
      following e-mail and Usenet news recipients.
      
        * cust-security-announce at cisco dot com
        * first-bulletins at lists dot first dot org
        * bugtraq at securityfocus dot com
        * vulnwatch at vulnwatch dot org
        * cisco at spot dot colorado dot edu
        * cisco-nsp at puck dot nether dot net
        * full-disclosure at lists.grok dot org dot uk
        * comp.dcom.sys.cisco at newsgate dot cisco dot com
      
      Future updates of this advisory, if any, will be placed on Cisco's
      worldwide website, but may or may not be actively announced on
      mailing lists or newsgroups. Users concerned about this problem are
      encouraged to check the above URL for any updates.
      
      Revision History
      ================
      
      +------------------------------------------------------------+
      | Revision 1.0 | 2011-September-28 | Initial public release. |
      +------------------------------------------------------------+
      
      Cisco Security Procedures
      =========================
      
      Complete information on reporting security vulnerabilities
      in Cisco products, obtaining assistance with security
      incidents, and registering to receive security information
      from Cisco, is available on Cisco's worldwide website at
      http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html.
      This includes instructions for press inquiries regarding
      Cisco security notices. All Cisco security advisories are available at
      http://www.cisco.com/go/psirt.
      
      +--------------------------------------------------------------------
      Copyright 2010-2011 Cisco Systems, Inc. All rights reserved.
      +--------------------------------------------------------------------
      
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