CVE-2013-5557: The Proxy Bypass Content Rewriter feature in the WebVPN subsystem in Cisco Adaptive Security Appliance (ASA...

Security readout for executives and security teams

This flaw can let an authenticated remote WebVPN user crash or trigger recovery on affected Cisco ASA devices. The business risk is service disruption: VPN access or security appliance availability may be interrupted. The bundle does not provide CVSS scoring, public exploit evidence, or fixed-version details. Exposure is most likely where Cisco ASA 9.1(2) or earlier is still deployed and WebVPN with Proxy Bypass Content Rewriter is enabled. The source bundle does not identify other affected products or versions. Treat this as a legacy perimeter availability risk. It is not proven actively exploited in the provided sources, but affected ASA devices may protect remote access and business connectivity, so remediation should be scheduled promptly where exposure exists. Mitigation focus: Review Cisco’s advisory for fixed releases or vendor-approved mitigations.; Inventory ASA devices running 9.1(2) or earlier.; Disable or limit affected WebVPN functionality if Cisco guidance supports it..

Prepared

Jun 14, 2026, 05:11 UTC (UTC+00:00)

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