CVE-2011-3296: 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 vulnerability affects Cisco Firewall Services Module deployments running specific older software releases with IPv6 in use. A remote attacker could cause the firewall module to crash or hang, disrupting traffic inspection or availability. The source bundle does not show active exploitation. Exposure is likely limited to legacy Cisco FWSM installations still in service, especially environments where IPv6 is enabled or processed. Organizations without FWSM, without these software trains, or without IPv6 use are less likely to be exposed based on the provided sources. Prioritize if Cisco FWSM still protects important network paths or handles IPv6 traffic. The business risk is service disruption at a security control. If the technology is retired or not using IPv6, urgency is lower but inventory validation is still warranted. Mitigation focus: Inventory Cisco FWSM modules and identify software train and version.; Review Cisco advisory guidance for the affected release train.; Upgrade to 3.1(21), 3.2(22), 4.0(16), 4.1(7), or later as applicable..

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.