CVE-2006-4911: Unspecified vulnerability in Cisco IPS 5.0 before 5.0(6p2) and 5.1 before 5.1(2), when running in inline or...

Security readout for executives and security teams

This CVE affects legacy Cisco IPS sensors. A remote attacker could send specially fragmented IP traffic that avoids inspection, meaning malicious traffic might pass without alerting or blocking. The issue matters only where Cisco IPS 5.0 or 5.1 is still deployed in inline or promiscuous mode. Exposure is limited to organizations still running Cisco IPS 5.0 or 5.1 in inline or promiscuous mode. Modern environments are unlikely to be affected unless legacy IPS appliances remain in production, monitoring, or lab networks. Prioritize if legacy Cisco IPS still protects sensitive network paths. The business risk is reduced detection or blocking of malicious traffic, not confirmed device takeover. If no affected Cisco IPS versions exist, this is a low operational concern. Mitigation focus: Inventory Cisco IPS sensors and confirm software versions.; Upgrade Cisco IPS 5.0 to 5.0(6p2) or later.; Upgrade Cisco IPS 5.1 to 5.1(2) or later..

Prepared

Jun 29, 2026, 10:19 UTC (UTC+00:00)

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