CVE-2013-3386: The IronPort Spam Quarantine (ISQ) component in the web framework in IronPort AsyncOS on Cisco Email Securi...

Security readout for executives and security teams

This is an old Cisco IronPort appliance denial-of-service issue. A remote attacker could make the spam quarantine service crash or hang by generating a high rate of TCP connection attempts. The business impact is availability: email security or quarantine workflows may become unreliable on affected legacy systems. Exposure is most likely in organizations still running legacy Cisco ESA or SMA AsyncOS versions from the affected ranges, especially where the ISQ or web interface is reachable from untrusted networks. Modern or upgraded deployments are less likely affected, but the bundle does not provide current product lifecycle status. Treat this as a legacy availability risk. Prioritize if affected Cisco email security appliances remain internet-facing or support business-critical mail quarantine workflows. If inventory confirms only fixed or retired systems, urgency is lower. Mitigation focus: Identify Cisco ESA and SMA appliances and record exact AsyncOS versions.; Upgrade affected systems to the fixed Cisco AsyncOS versions or later.; Restrict ISQ and web interface access to trusted administrative networks..

Prepared

Jun 14, 2026, 22:07 UTC (UTC+00:00)

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