Buffer overflow in the Cisco Firewall Services Module (FWSM) in Cisco Catalyst 6500 and 7600 series devices allows remote attackers to cause a denial of service (crash and reload) via HTTP auth requests for (1) TACACS+ or (2) RADIUS authentication.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2003-0991
http://www.cisco.com/warp/public/707/cisco-sa-20031215-fwsm.shtml