The Autonomic Networking Infrastructure (ANI) implementation in Cisco IOS 15.4S and 15.4(3)S allows remote attackers to modify configuration settings or cause a denial of service (partial service outage) by sending crafted Autonomic Networking (AN) messages on an intranet network, aka Bug ID CSCup62167.
http://www.securitytracker.com/id/1031967
http://tools.cisco.com/security/center/viewAlert.x?alertId=37935