CVE-2003-1001: Buffer overflow in the Cisco Firewall Services Module (FWSM) in Cisco Catalyst 6500 and 7600 series devices...

Security readout for executives and security teams

CVE-2003-1001 is a remote denial-of-service issue in Cisco Firewall Services Module deployments on Catalyst 6500 and 7600 series devices. Successful triggering can crash and reload the firewall module, disrupting traffic inspection or segmentation. The provided sources do not include CVSS scoring, affected software versions, or confirmed exploitation. Exposure is most likely in legacy Cisco Catalyst 6500 or 7600 environments using Cisco FWSM with HTTP authentication tied to TACACS+ or RADIUS. Organizations without FWSM, without those platforms, or without reachable HTTP authentication are less likely exposed. Treat this as a targeted legacy-infrastructure risk. It deserves prompt attention if these Cisco firewall modules still protect critical network paths, because outage of the module can disrupt security controls and traffic flow. If the hardware is retired, priority is low after confirming absence. Mitigation focus: Inventory Catalyst 6500 and 7600 devices for installed Cisco FWSM modules.; Check Cisco advisory guidance for affected and fixed FWSM software versions.; Restrict HTTP authentication access to trusted management networks where feasible..

Prepared

Jun 30, 2026, 07:43 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.