Cisco IOS 12.0S, 12.2, and 12.3, with Open Shortest Path First (OSPF) enabled, allows remote attackers to cause a denial of service (device reload) via a malformed OSPF packet.
https://exchange.xforce.ibmcloud.com/vulnerabilities/17033
http://www.securityfocus.com/bid/10971
http://www.kb.cert.org/vuls/id/989406
http://www.cisco.com/warp/public/707/cisco-sa-20040818-ospf.shtml