Cisco 12000 Series Internet Router Denial Of Service Vulnerability
Cisco 12000 Series Internet Routers are prone to a denial of service condition. If circumstances require an affected router to send out a large of number of ICMP Unreachable packets, this may starve CPU resources and cause services to be denied. Successful exploitation may cause the router to stop forwarding packets.
This condition may occur when the router is "Black Hole" filtering.
It should be noted that this vulnerability only affects certain Cisco 12000 Series Internet Routers, and other Cisco router products should not be considered vulnerable.
Cisco classifies this issue under Vulnerability CSCdr46528, Vulnerability CSCds36541 and Vulnerability CSCdt66560.