Unspecified vulnerability in Cisco Intrusion Prevention System (IPS) 5.x before 5.1(8)E2 and 6.x before 6.0(5)E2, when inline mode and jumbo Ethernet support are enabled, allows remote attackers to cause a denial of service (panic), and possibly bypass intended restrictions on network traffic, via a "specific series of jumbo Ethernet frames."
https://exchange.xforce.ibmcloud.com/vulnerabilities/43166
http://www.vupen.com/english/advisories/2008/1872/references
http://www.securitytracker.com/id?1020326
http://www.securityfocus.com/bid/29791
http://www.cisco.com/en/US/products/products_security_advisory09186a00809b3842.shtml