CVE-2005-0197: Cisco IOS 12.1T, 12.2, 12.2T, 12.3 and 12.3T, with Multi Protocol Label Switching (MPLS) installed but disa...

Security readout for executives and security teams

This older Cisco IOS issue can let a remote attacker force an affected router to reload, causing a denial of service. The exposed condition is specific: MPLS is installed but disabled on Cisco IOS 12.1T, 12.2, 12.2T, 12.3, or 12.3T. Exposure is most likely in legacy Cisco router environments still running the named IOS trains with MPLS installed but disabled. Modern fleets are less likely affected, but inherited network infrastructure should be checked. Treat this as a legacy infrastructure availability risk. Prioritize if affected routers support critical WAN, MPLS, or customer connectivity paths; otherwise handle through normal network lifecycle remediation. Mitigation focus: Review Cisco advisory 20050126 for fixed software and vendor-approved workarounds.; Identify and upgrade or retire routers running affected Cisco IOS trains.; Restrict untrusted traffic to router interfaces where operationally possible..

Prepared

Jun 30, 2026, 01:23 UTC (UTC+00:00)

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