CVE-2011-3304: Cisco Adaptive Security Appliances (ASA) 5500 series devices, and the ASA Services module in Cisco Catalyst...

Security readout for executives and security teams

This issue affects older Cisco ASA firewall platforms and can make the device reload when it processes crafted MSN Instant Messenger traffic. The business risk is service interruption: firewall reloads can briefly disrupt network access, VPNs, or protected services. The source bundle does not provide CVSS scoring or current exploitation evidence. Exposure is most likely where legacy Cisco ASA 5500 or Catalyst 6500 ASA Services Module deployments still run the listed vulnerable software and process relevant IM traffic. Modern or upgraded deployments are not shown as affected by the provided sources. Treat this as a legacy network availability risk. It is not presented as active exploitation, but affected firewalls sit on critical traffic paths, so remediation should be scheduled where vulnerable versions remain in production. Mitigation focus: Inventory Cisco ASA and ASA Services Module deployments.; Upgrade affected releases to Cisco’s listed fixed versions or later.; Prioritize unsupported or internet-edge legacy firewalls for replacement review..

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.