CVE-2016-6465: A vulnerability in the content filtering functionality of Cisco AsyncOS Software for Cisco Email Security A...

Security readout for executives and security teams

Cisco email and web security appliances could fail to enforce configured content filters. An unauthenticated remote attacker could get content past filters that should inspect incoming email attachments or accessed web content. This weakens a security control rather than directly compromising the appliance. Organizations running older Cisco ESA or WSA AsyncOS releases are exposed only if the relevant content scanning features are configured. Known affected releases listed include 10.0.0-125, 8.5.7-042, and 9.7.2-047. Prioritize remediation for internet-facing mail and web gateways that enforce malware, phishing, or data-control policies. The main risk is reduced filtering reliability, so urgency depends on whether these appliances are a primary security control. Mitigation focus: Check Cisco advisory guidance for the first fixed AsyncOS release.; Upgrade affected ESA and WSA appliances to a fixed AsyncOS release.; Confirm email attachment and web content scanning policies still match business requirements..

Prepared

Jun 13, 2026, 13:16 UTC (UTC+00:00)

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