CVE-2006-6931: Algorithmic complexity vulnerability in Snort before 2.6.1, during predicate evaluation in rule matching fo...

Security readout for executives and security teams

This CVE affects older Snort intrusion detection deployments. Crafted network traffic can make rule matching consume excessive CPU, potentially causing a detection outage while the sensor is overloaded. The available sources describe denial of service, not code execution or data theft. Exposure is most likely where legacy Snort sensors earlier than 2.6.1 still inspect untrusted or high-volume network traffic. Current supported Snort deployments may not be affected, but appliance or distribution packages should be checked against vendor advisory versions. Treat this as a legacy IDS resilience issue. It can create a security monitoring blind spot rather than directly compromise systems. Prioritize remediation where Snort protects high-value, internet-facing, or regulated environments. Mitigation focus: Inventory Snort sensors and packaged appliances for versions before 2.6.1.; Upgrade affected Snort deployments to 2.6.1 or vendor-fixed packages.; Review Gentoo, Mandriva, Snort, or distribution advisories for package-specific fixes..

Prepared

Jun 29, 2026, 08:16 UTC (UTC+00:00)

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