The IKE implementation in Cisco IOS 12.2 through 12.4 on Cisco 7200 and 7301 routers with VAM2+ allows remote attackers to cause a denial of service (device reload) via a malformed IKE packet, aka Bug ID CSCtb13491.
https://exchange.xforce.ibmcloud.com/vulnerabilities/57148
http://www.vupen.com/english/advisories/2010/0709
http://www.securitytracker.com/id?1023741
http://www.securityfocus.com/bid/38932
http://www.cisco.com/en/US/products/products_security_advisory09186a0080b20ee5.shtml