CVE-2012-6431: Symfony 2.0.x before 2.0.20 does not process URL encoded data consistently within the Routing and Security...

Security readout for executives and security teams

This is an old Symfony issue where applications could treat doubly encoded URLs differently in routing and security checks. A remote attacker might reach a URI the application meant to restrict. Business risk depends on whether legacy Symfony 2.0.x applications remain in use and whether protected routes rely on URI restrictions. Exposure is most likely in legacy applications still running Symfony 2.0.x earlier than 2.0.20, especially where route-level URI restrictions protect sensitive functions. Modern Symfony versions are not identified as affected in the supplied sources. Moderate attention if legacy Symfony applications are present; otherwise low immediate urgency. The main business concern is hidden legacy exposure rather than broad current platform risk. Confirm inventory first, then patch or retire affected systems. Mitigation focus: Inventory applications using Symfony 2.0.x.; Upgrade affected Symfony 2.0.x deployments to 2.0.20 or later.; Review the Symfony security release for version-specific guidance..

Prepared

Jun 24, 2026, 12:04 UTC (UTC+00:00)

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