Summary

• Cisco IOS Software and Cisco IOS XE Software contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. An attacker could exploit this vulnerability by sending a crafted request to an affected device that has the DHCP version 6 (DHCPv6) server feature enabled, causing a reload.
  
  Cisco has released software updates that address this vulnerability.  This advisory is available at the following link:
  https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120926-dhcpv6
  
  

  Note: The September 26, 2012, Cisco IOS Software Security Advisory bundled publication includes nine Cisco Security Advisories. Eight of the advisories address vulnerabilities in Cisco IOS Software, and one advisory addresses a vulnerability in Cisco Unified Communications Manager. Each Cisco IOS Software Security 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 Cisco IOS Software vulnerabilities in the September 2012 bundled publication. 

  Individual publication links are in "Cisco Event Response: Semi-Annual Cisco IOS Software Security Advisory Bundled Publication" at the following link:

  http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep12.html

  
  

Affected Products

• 
  

  Vulnerable Products

  Cisco devices that are running affected Cisco IOS Software or Cisco IOS XE Software with the DHCPv6 server feature enabled are vulnerable. The DHCPv6 server feature is not enabled by default.  Cisco devices that are configured as DHCPv6 clients or relay agents are not affected by this vulnerability.    
  
  To determine whether a Cisco IOS device or Cisco IOS XE device is configured as a DHCPv6 server, issue the show ipv6 dhcp interface command.  
  
  The following example shows a Cisco IOS device that is not vulnerable because it is not configured as a DHCPv6 server:

  Router#show ipv6 dhcp interface 
  Router#

  The following example shows a Cisco IOS device that is affected by this vulnerability. The device is vulnerable because the DHCPv6 server feature is applied to the FastEthernet0/0 interface:

  Router#show ipv6 dhcp interface
  FastEthernet0/0 is in server mode
    Using pool: DHCPv6-stateful
    Preference value: 0
    Hint from client: ignored
    Rapid-Commit: disabled
  Router#
  
  

  The following example shows a Cisco IOS device that is affected by this vulnerability. The device is vulnerable because the DHCPv6 server feature is applied to the FastEthernet0/0 and FastEthernet0/1 interfaces:

  Router#show ipv6 dhcp interface | include server
  FastEthernet0/0 is in server mode
  FastEthernet0/1 is in server mode
  Router#

  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 "White Paper: Cisco IOS and NX-OS Software Reference Guide" at http://www.cisco.com/web/about/security/intelligence/ios-ref.html.

  
  
  

  
  

  Products Confirmed Not Vulnerable

  Cisco IOS XR Software is not affected by this vulnerability.
  
   No other Cisco products are currently known to be affected by this vulnerability.

Details

• The DHCPv6 Server feature in Cisco IOS Software and Cisco IOS XE Software is a DHCPv6 server implementation that assigns and manages IPv6 addresses, prefixes and other information from specified address pools to DHCPv6 clients.
  
  Cisco IOS Software and Cisco IOS XE Software contain a vulnerability that could allow an unauthenticated, remote attacker to cause a DoS condition. An attacker could exploit this vulnerability by sending a crafted request to an affected device that has the DHCPv6 server feature enabled, causing a reload.
  
  The vulnerability is triggered when the affected Cisco IOS device attempts to process a malformed DHCPv6 packet. Valid DHCPv6 packets will not trigger this vulnerability. DHCPv6 packets that the Cisco IOS device forwards (for example, transit DHCPv6 traffic) will not trigger this vulnerability.  
  
  Cisco IOS devices that are configured as a DHCP server for IPv4 are not affected by this vulnerability.
  
  This vulnerability has been documented in Cisco bug ID CSCto57723 (registered customers only).  This vulnerability has been assigned the Common Vulnerabilities and Exposures (CVE) ID CVE-2012-4623.

  
  

  
  

Workarounds

• There are no workarounds for this vulnerability
  

Fixed Software

• When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.

  In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
  
  

  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 column. The First Fixed Release for All Advisories in the September 2012 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.

  The Cisco IOS Software Checker allows customers to search for Cisco Security Advisories that address specific Cisco IOS Software releases. This tool is available on the Cisco Security (SIO) portal at https://sec.cloudapps.cisco.com/security/center/selectIOSVersion.x

  Major Release	Availability of Repaired Releases
  Affected 12.0-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2012 Cisco IOS Software Security Advisory Bundled Publication
  There are no affected 12.0 based releases
  Affected 12.2-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2012 Cisco IOS Software Security Advisory Bundled Publication
  12.2	Not vulnerable	Not vulnerable
  12.2B	Not vulnerable	Vulnerable; First fixed in Release 12.4 Releases up to and including 12.2(4)B8 are not vulnerable.
  12.2BC	Not vulnerable	Not vulnerable
  12.2BW	Not vulnerable	Not vulnerable
  12.2BX	Not vulnerable	12.2(15)BX Releases up to and including 12.2(2)BX1 are not vulnerable.
  12.2BY	Not vulnerable	Not vulnerable
  12.2BZ	Not vulnerable	Not vulnerable
  12.2CX	Not vulnerable	Not vulnerable
  12.2CY	Not vulnerable	Not vulnerable
  12.2CZ	Not vulnerable	Vulnerable; migrate to any release in 12.2S
  12.2DA	Not vulnerable	Not vulnerable
  12.2DD	Not vulnerable	Not vulnerable
  12.2DX	Not vulnerable	Not vulnerable
  12.2EU	Not vulnerable	Not vulnerable
  12.2EW	Not vulnerable	Not vulnerable
  12.2EWA	Not vulnerable	Not vulnerable
  12.2EX	Vulnerable; First fixed in Release 15.0SE Releases up to and including 12.2(37)EX are not vulnerable.	Vulnerable; First fixed in Release 15.0SE Releases up to and including 12.2(37)EX are not vulnerable.
  12.2EY	Vulnerable; First fixed in Release 15.1EY Releases up to and including 12.2(46)EY are not vulnerable.	Vulnerable; First fixed in Release 15.1EY Releases up to and including 12.2(46)EY are not vulnerable.
  12.2EZ	Not vulnerable	Not vulnerable
  12.2FX	Not vulnerable	Not vulnerable
  12.2FY	Not vulnerable	Not vulnerable
  12.2FZ	Not vulnerable	Not vulnerable
  12.2IRA	Vulnerable; First fixed in Release 12.2SRE	Vulnerable; First fixed in Release 12.2SRE
  12.2IRB	Vulnerable; First fixed in Release 12.2SRE	Vulnerable; First fixed in Release 12.2SRE
  12.2IRC	Vulnerable; First fixed in Release 12.2SRE	Vulnerable; First fixed in Release 12.2SRE
  12.2IRD	Vulnerable; First fixed in Release 12.2SRE	Vulnerable; First fixed in Release 12.2SRE
  12.2IRE	Vulnerable; First fixed in Release 12.2SRE	Vulnerable; First fixed in Release 12.2SRE
  12.2IRF	Vulnerable; First fixed in Release 12.2SRE	Vulnerable; First fixed in Release 12.2SRE
  12.2IRG	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2IRH	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2IRI	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2IXA	Not vulnerable	Not vulnerable
  12.2IXB	Not vulnerable	Not vulnerable
  12.2IXC	Not vulnerable	Not vulnerable
  12.2IXD	Not vulnerable	Not vulnerable
  12.2IXE	Not vulnerable	Not vulnerable
  12.2IXF	Not vulnerable	Not vulnerable
  12.2IXG	Not vulnerable	Not vulnerable
  12.2IXH	Not vulnerable	Not vulnerable
  12.2JA	Not vulnerable	Not vulnerable
  12.2JK	Not vulnerable	Not vulnerable
  12.2MB	Not vulnerable	Not vulnerable
  12.2MC	Not vulnerable	Releases up to and including 12.2(15)MC1 are not vulnerable. Releases 12.2(15)MC2b and later are not vulnerable. First fixed in Release 12.4
  12.2MRA	Vulnerable; First fixed in Release 12.2SRE	Vulnerable; First fixed in Release 12.2SRE
  12.2MRB	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2S	Not vulnerable	Not vulnerable
  12.2SB	12.2(33)SB13	12.2(33)SB13
  12.2SBC	Vulnerable; First fixed in Release 12.2SB	Vulnerable; First fixed in Release 12.2SB
  12.2SCA	Vulnerable; First fixed in Release 12.2SCF	Vulnerable; First fixed in Release 12.2SCF
  12.2SCB	Vulnerable; First fixed in Release 12.2SCF	Vulnerable; First fixed in Release 12.2SCF
  12.2SCC	Vulnerable; First fixed in Release 12.2SCF	Vulnerable; First fixed in Release 12.2SCF
  12.2SCD	Vulnerable; First fixed in Release 12.2SCF	Vulnerable; First fixed in Release 12.2SCF
  12.2SCE	Vulnerable; First fixed in Release 12.2SCF	Vulnerable; First fixed in Release 12.2SCF
  12.2SCF	12.2(33)SCF4	12.2(33)SCF4
  12.2SCG	Not vulnerable	Not vulnerable
  12.2SE	12.2(46)SE1 12.2(55)SE6	12.2(46)SE1 12.2(55)SE6
  12.2SEA	Not vulnerable	Not vulnerable
  12.2SEB	Not vulnerable	Not vulnerable
  12.2SEC	Not vulnerable	Not vulnerable
  12.2SED	Not vulnerable	Not vulnerable
  12.2SEE	Not vulnerable	Not vulnerable
  12.2SEF	Not vulnerable	Not vulnerable
  12.2SEG	Not vulnerable	Not vulnerable
  12.2SG	12.2(53)SG8	12.2(53)SG8 Vulnerable; releases up to and including 12.2(46)SG1 are not vulnerable.
  12.2SGA	Not vulnerable	Not vulnerable
  12.2SM	Not vulnerable	Not vulnerable
  12.2SO	Not vulnerable	Not vulnerable
  12.2SQ	Releases up to and including 12.2(44)SQ2 are not vulnerable.	Releases up to and including 12.2(44)SQ2 are not vulnerable.
  12.2SRA	Not vulnerable	Not vulnerable
  12.2SRB	Not vulnerable	Not vulnerable
  12.2SRC	Vulnerable; First fixed in Release 12.2SRE	Vulnerable; First fixed in Release 12.2SRE
  12.2SRD	Vulnerable; First fixed in Release 12.2SRE	Vulnerable; First fixed in Release 12.2SRE
  12.2SRE	12.2(33)SRE7	12.2(33)SRE7
  12.2STE	Not vulnerable	Not vulnerable
  12.2SU	Not vulnerable	Not vulnerable
  12.2SV	Not vulnerable	Not vulnerable
  12.2SVA	Not vulnerable	Not vulnerable
  12.2SVC	Not vulnerable	Not vulnerable
  12.2SVD	Not vulnerable	Not vulnerable
  12.2SVE	Not vulnerable	Not vulnerable
  12.2SW	Not vulnerable	Not vulnerable
  12.2SX	Not vulnerable	Not vulnerable
  12.2SXA	Not vulnerable	Not vulnerable
  12.2SXB	Not vulnerable	Not vulnerable
  12.2SXD	Not vulnerable	Not vulnerable
  12.2SXE	Not vulnerable	Not vulnerable
  12.2SXF	Not vulnerable	Not vulnerable
  12.2SXH	Not vulnerable	Vulnerable; releases up to and including 12.2(33)SXH7 are not vulnerable
  12.2SXI	12.2(33)SXI10	12.2(33)SXI10
  12.2SXJ	12.2(33)SXJ4	12.2(33)SXJ4
  12.2SY	12.2(50)SY3 Only releases 12.2(50)SY through 12.2(50)SY2 are vulnerable.	12.2(50)SY3
  12.2SZ	Not vulnerable	Not vulnerable
  12.2T	Not vulnerable	Vulnerable; First fixed in Release 12.4 Releases up to and including 12.2(8)T10 are not vulnerable.
  12.2TPC	Not vulnerable	Not vulnerable
  12.2WO	Vulnerable; First fixed in Release 15.0SG	Vulnerable; First fixed in Release 15.0SG
  12.2XA	Not vulnerable	Not vulnerable
  12.2XB	Not vulnerable	Not vulnerable
  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
  12.2XNA	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
  12.2XNB	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
  12.2XNC	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
  12.2XND	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
  12.2XNE	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
  12.2XNF	Please see Cisco IOS-XE Software Availability	Please see Cisco IOS-XE Software Availability
  12.2XO	Vulnerable; First fixed in Release 12.2SG Releases up to and including 12.2(40)XO are not vulnerable.	Vulnerable; First fixed in Release 12.2SG Releases up to and including 12.2(40)XO 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	Not vulnerable
  12.2YC	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2YD	Not vulnerable	Not vulnerable
  12.2YE	Not vulnerable	Not vulnerable
  12.2YK	Not vulnerable	Not vulnerable
  12.2YO	Not vulnerable	Not vulnerable
  12.2YP	Not vulnerable	Not vulnerable
  12.2YT	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2YW	Not vulnerable	Not vulnerable
  12.2YX	Not vulnerable	Not vulnerable
  12.2YY	Not vulnerable	Not vulnerable
  12.2YZ	Not vulnerable	Not vulnerable
  12.2ZA	Not vulnerable	Not vulnerable
  12.2ZB	Not vulnerable	Not vulnerable
  12.2ZC	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2ZD	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2ZE	Not vulnerable	Vulnerable; First fixed in Release 12.4
  12.2ZH	Not vulnerable	Vulnerable; First fixed in Release 12.4
  12.2ZJ	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2ZP	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.2ZU	Not vulnerable	Not vulnerable
  12.2ZX	Vulnerable; First fixed in Release 12.2SB	Vulnerable; First fixed in Release 12.2SB
  12.2ZY	Not vulnerable	Not vulnerable
  12.2ZYA	Not vulnerable	Not vulnerable
  Affected 12.3-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2012 Cisco IOS Software Security Advisory Bundled Publication
  12.3	Not vulnerable	Vulnerable; First fixed in Release 12.4
  12.3B	Not vulnerable	Vulnerable; First fixed in Release 12.4
  12.3BC	Not vulnerable	Not vulnerable
  12.3BW	Not vulnerable	Not vulnerable
  12.3JA	Not vulnerable	Not vulnerable
  12.3JEA	Not vulnerable	Not vulnerable
  12.3JEB	Not vulnerable	Not vulnerable
  12.3JEC	Not vulnerable	Not vulnerable
  12.3JED	Not vulnerable	Not vulnerable
  12.3JEE	Not vulnerable	Not vulnerable
  12.3JK	Releases up to and including 12.3(2)JK3 are not vulnerable. Releases 12.3(8)JK1 and later are not vulnerable. First fixed in Release 12.4	Releases up to and including 12.3(2)JK3 are not vulnerable. Releases 12.3(8)JK1 and later are not vulnerable. First fixed in Release 12.4
  12.3JL	Not vulnerable	Not vulnerable
  12.3JX	Not vulnerable	Not vulnerable
  12.3T	Vulnerable; First fixed in Release 12.4 Releases up to and including 12.3(8)T11 are not vulnerable.	Vulnerable; First fixed in Release 12.4
  12.3TPC	Not vulnerable	Releases up to and including 12.3(4)TPC11a are not vulnerable.
  12.3VA	Not vulnerable	Not vulnerable
  12.3XA	Not vulnerable	Releases prior to 12.3(2)XA7 are vulnerable; Releases 12.3(2)XA7 and later are not vulnerable. First fixed in Release 12.4
  12.3XB	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.3XC	Not vulnerable	Vulnerable; First fixed in Release 12.4
  12.3XD	Not vulnerable	Vulnerable; First fixed in Release 12.4
  12.3XE	Not vulnerable	Vulnerable; First fixed in Release 12.4
  12.3XF	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.3XG	Not vulnerable	Vulnerable; First fixed in Release 12.4
  12.3XI	Not vulnerable	12.3(7)XI1b
  12.3XJ	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.3XK	Not vulnerable	Vulnerable; First fixed in Release 12.4
  12.3XL	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.3XQ	Not vulnerable	Vulnerable; First fixed in Release 12.4
  12.3XR	Not vulnerable	Vulnerable; First fixed in Release 12.4
  12.3XU	Not vulnerable	Vulnerable; First fixed in Release 12.4T Releases up to and including 12.3(8)XU1 are not vulnerable.
  12.3XW	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  12.3XX	Not vulnerable	Vulnerable; First fixed in Release 12.4
  12.3XY	Not vulnerable	Vulnerable; First fixed in Release 12.4
  12.3XZ	Not vulnerable	Vulnerable; First fixed in Release 12.4
  12.3YD	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.3YF	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.3YG	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.3YI	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.3YJ	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.3YK	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.3YM	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.3YQ	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.3YS	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.3YT	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.3YU	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.3YX	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.3YZ	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.3ZA	Not vulnerable	Vulnerable; First fixed in Release 12.4T
  Affected 12.4-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2012 Cisco IOS Software Security Advisory Bundled Publication
  12.4	12.4(25g)	12.4(25g)
  12.4GC	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4JA	Not vulnerable	Not vulnerable
  12.4JAL	Not vulnerable	Not vulnerable
  12.4JAX	Not vulnerable	Not vulnerable
  12.4JAY	Not vulnerable	Not vulnerable
  12.4JDA	Not vulnerable	Not vulnerable
  12.4JDC	Not vulnerable	Not vulnerable
  12.4JDD	Not vulnerable	Not vulnerable
  12.4JDE	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
  12.4JX	Not vulnerable	Not vulnerable
  12.4JY	Not vulnerable	Not vulnerable
  12.4JZ	Not vulnerable	Not vulnerable
  12.4MD	Not vulnerable	12.4(24)MD7
  12.4MDA	Vulnerable; migrate to any release in 12.4MD Releases up to and including 12.4(22)MDA6 are not vulnerable.	Releases up to and including 12.4(22)MDA6 are not vulnerable
  12.4MDB	12.4(24)MDB10	12.4(24)MDB10
  12.4MR	Releases up to and including 12.4(16)MR are not vulnerable.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4MRA	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4MRB	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.4SW	Not vulnerable	Not vulnerable
  12.4T	12.4(24)T8	12.4(24)T8
  12.4XA	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.4XB	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.4XC	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.4XD	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.4XE	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.4XF	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.4XG	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.4XJ	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.4XK	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.4XL	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4XM	Releases up to and including 12.4(15)XM are not vulnerable. Releases 12.4(15)XM3 and later are not vulnerable. First fixed in Release 12.4T	Releases up to and including 12.4(15)XM are not vulnerable. Releases 12.4(15)XM3 and later are not vulnerable. First fixed in Release 12.4T
  12.4XN	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4XP	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4XQ	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.4XR	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.4XT	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.4XV	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4XW	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.4XY	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.4XZ	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.4YA	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.4YB	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4YD	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  12.4YE	Vulnerable; First fixed in Release 12.4T	Vulnerable; First fixed in Release 12.4T
  12.4YG	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  Affected 15.0-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2012 Cisco IOS Software Security Advisory Bundled Publication
  15.0EX	Not vulnerable	Not vulnerable
  15.0EY	Not vulnerable	Not vulnerable
  15.0M	15.0(1)M9	15.0(1)M9
  15.0MR	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  15.0MRA	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  15.0S	15.0(1)S6 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability	15.0(1)S6 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.0SE	15.0(2)SE	15.0(2)SE
  15.0SG	15.0(2)SG5 15.0(2)SG6; Available on 11-OCT-12 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability	15.0(2)SG5 15.0(2)SG6 ; Available on 11-OCT-12 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.0SY	15.0(1)SY2	15.0(1)SY2
  15.0XA	Vulnerable; First fixed in Release 15.1M	Vulnerable; First fixed in Release 15.1M
  15.0XO	Cisco IOS XE devices: Please see Cisco IOS-XE Software Availability	Cisco IOS XE devices: Please see Cisco IOS-XE Software Availability
  Affected 15.1-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2012 Cisco IOS Software Security Advisory Bundled Publication
  15.1EY	15.1(2)EY4	15.1(2)EY4
  15.1GC	Vulnerable; First fixed in Release 15.1M	Vulnerable; First fixed in Release 15.1M
  15.1M	15.1(4)M5	15.1(4)M5
  15.1MR	15.1(3)MR; Available on 01-OCT-12	15.1(3)MR; Available on 01-OCT-12
  15.1S	Cisco IOS XE devices: Please see Cisco IOS XE Software Availability	15.1(3)S Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.1SG	15.1(1)SG1 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability	15.1(1)SG1 15.1(2)SG 12-NOV-12 Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.1SNG	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  15.1SNH	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  15.1SNI	Vulnerable; migrate to any release in 15.2SNG	Vulnerable; migrate to any release in 15.2SNG
  15.1SV	Not vulnerable	Vulnerable; contact your support organization per the instructions in Obtaining Fixed Software section of this advisory.
  15.1T	Vulnerable; First fixed in Release 15.1M	Vulnerable; First fixed in Release 15.1M
  15.1XB	Vulnerable; First fixed in Release 15.1M	Vulnerable; First fixed in Release 15.1M
  Affected 15.2-Based Releases	First Fixed Release	First Fixed Release for All Advisories in the September 2012 Cisco IOS Software Security Advisory Bundled Publication
  15.2GC	Releases prior to 15.2(3)GC are vulnerable; Releases 15.2(3)GC and later are not vulnerable. First fixed in Release 15.2T	Releases prior to 15.2(3)GC are vulnerable; Releases 15.2(3)GC and later are not vulnerable. First fixed in Release 15.2T
  15.2JA	Not vulnerable	Not Vulnerable
  15.2M	15.2(4)M	Not vulnerable
  15.2S	Not vulnerable Cisco IOS XE devices: Please see Cisco IOS XE Software Availability	15.2(1)S2 15.2(2)S1 15.2(4)S Cisco IOS XE devices: Please see Cisco IOS XE Software Availability
  15.2SNG	Not vulnerable	Not vulnerable
  15.2T	15.2(1)T3 15.2(2)T2 15.2(3)T2; Available on 12-OCT-12	15.2(1)T3 15.2(2)T2 15.2(3)T2; Available on 12-OCT-12

  
  

  Cisco IOS XE Software

  Cisco IOS XE Software is affected by this vulnerability.
  
  

  Cisco IOS XE Software Release	First Fixed Release	First Fixed Release for All Advisories in the September 2012 Cisco IOS Software Security Advisory Bundled Publication
  2.1.x	Vulnerable; migrate to 3.4.0S or later.	Vulnerable; migrate to 3.6.0S or later.
  2.2.x	Vulnerable; migrate to 3.4.0S or later.	Vulnerable; migrate to 3.6.0S or later.
  2.3.x	Vulnerable; migrate to 3.4.0S or later.	Vulnerable; migrate to 3.6.0S or later.
  2.4.x	Vulnerable; migrate to 3.4.0S or later.	Vulnerable; migrate to 3.6.0S or later.
  2.5.x	Vulnerable; migrate to 3.4.0S or later.	Vulnerable; migrate to 3.6.0S or later.
  2.6.x	Vulnerable; migrate to 3.4.0S or later.	Vulnerable; migrate to 3.6.0S or later.
  3.1.xS	3.1.4S	3.1.4S
  3.1.xSG	Vulnerable; migrate to 3.2.5SG or later.	Vulnerable; migrate to 3.2.5SG or later.
  3.2.xS	Vulnerable; migrate to 3.4.0S or later.	Vulnerable; migrate to 3.6.0S or later.
  3.2.xSG	3.2.5SG	3.2.5SG
  3.2.xXO	Vulnerable; migrate to 3.3.1SG or later	Vulnerable; migrate to 3.3.1SG or later.
  3.3.xS	Vulnerable; migrate to 3.4.0S or later.	Vulnerable; migrate to 3.6.0S or later.
  3.3.x.SG	3.3.1SG	3.3.1SG
  3.4.xS	Not vulnerable	Vulnerable; migrate to 3.6.0S or later.
  3.5.xS	Not vulnerable	Vulnerable; migrate to 3.6.0S or later.
  3.6.xS	Not vulnerable	Not vulnerable
  3.7.xS	Not vulnerable	Not vulnerable

  Cisco IOS XR Software

  Cisco IOS XR Software is not affected by this vulnerability.
  

Exploitation and Public Announcements

• The Cisco Product Security Incident Response Team (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.

  
  

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120926-dhcpv6

Revision History

• Revision 1.1	2012-October-18	Added Cisco IOS 12.2(46)SE1 as an additional First Fixed Release.
  Revision 1.0	2012-September-26	Initial public release.

  Show Less