Cisco IOS 15.1 through 15.3 and IOS XE 3.3 and 3.5 before 3.5.2E; 3.7 before 3.7.5S; and 3.8, 3.9, and 3.10 before 3.10.2S allow remote attackers to cause a denial of service (I/O memory consumption and device reload) via a malformed IPv6 packet, aka Bug ID CSCui59540.
http://www.securityfocus.com/bid/66467
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140326-ipv6