The (1) Cisco Unified Communications Manager Express; (2) SIP Gateway Signaling Support Over Transport Layer Security (TLS) Transport; (3) Secure Signaling and Media Encryption; (4) Blocks Extensible Exchange Protocol (BEEP); (5) Network Admission Control HTTP Authentication Proxy; (6) Per-user URL Redirect for EAPoUDP, Dot1x, and MAC Authentication Bypass; (7) Distributed Director with HTTP Redirects; and (8) TCP DNS features in Cisco IOS 12.0 through 12.4 do not properly handle IP sockets, which allows remote attackers to cause a denial of service (outage or resource consumption) via a series of crafted TCP packets.
https://exchange.xforce.ibmcloud.com/vulnerabilities/49418
http://www.vupen.com/english/advisories/2009/0851
http://www.securityfocus.com/bid/34242
http://www.cisco.com/en/US/products/products_security_advisory09186a0080a904c6.shtml
http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90469.shtml