Buffer overflow in Firewall Authentication Proxy for FTP and/or Telnet Sessions for Cisco IOS 12.2ZH and 12.2ZL, 12.3 and 12.3T, and 12.4 and 12.4T allows remote attackers to cause a denial of service and possibly execute arbitrary code via crafted user authentication credentials.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5317
http://www.vupen.com/english/advisories/2005/1669
http://www.kb.cert.org/vuls/id/236045
http://www.cisco.com/warp/public/707/cisco-sa-20050907-auth_proxy.shtml