Cisco IOS 12.0 through 12.4 and IOS XR before 3.2, with IPv6 enabled, allows remote attackers on a local network segment to cause a denial of service (device reload) and possibly execute arbitrary code via a crafted IPv6 packet.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5445
https://exchange.xforce.ibmcloud.com/vulnerabilities/21591
http://www.us-cert.gov/cas/techalerts/TA05-210A.html
http://www.securityfocus.com/bid/14414
http://www.kb.cert.org/vuls/id/930892
http://www.cisco.com/warp/public/707/cisco-sa-20050729-ipv6.shtml
http://securitytracker.com/id?1014598
http://secunia.com/advisories/16272
http://archives.neohapsis.com/archives/fulldisclosure/2005-07/0663.html