CVE-2011-3297: Cisco Firewall Services Module (aka FWSM) 3.1 before 3.1(21), 3.2 before 3.2(22), 4.0 before 4.0(16), and 4...

Security readout for executives and security teams

This issue affects legacy Cisco Firewall Services Module deployments. Under certain authentication configurations, repeated network-access authentication requests can crash the module, causing a denial of service. Business impact is service disruption, not data theft or code execution based on the supplied sources. Exposure is likely limited to organizations still running Cisco FWSM versions before 3.1(21), 3.2(22), 4.0(16), or 4.1(7), and using the affected authentication configurations. The source bundle does not prove all FWSM deployments are vulnerable. Prioritize remediation where FWSM still protects critical network paths. The vulnerability can disrupt firewall availability, but available evidence does not indicate active exploitation or data compromise. Mitigation focus: Upgrade affected FWSM trains to Cisco’s fixed releases or later.; Check Cisco’s advisory for exact upgrade guidance and affected configurations.; Identify and review FWSM authentication configurations used for network access..

Prepared

Jun 27, 2026, 17:48 UTC (UTC+00:00)

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