Cisco IOS 12.4, when IOS firewall Application Inspection Control (AIC) with HTTP Deep Packet Inspection is enabled, allows remote attackers to cause a denial of service (device reload) via a malformed HTTP transit packet.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5302
http://www.vupen.com/english/advisories/2008/2670
http://www.securityfocus.com/bid/31354
http://www.cisco.com/en/US/products/products_security_advisory09186a0080a01545.shtml
http://tools.cisco.com/security/center/viewAlert.x?alertId=16661