CVE-2006-1928: Cisco IOS XR, when configured for Multi Protocol Label Switching (MPLS) and running on Cisco CRS-1 routers,...

Security readout for executives and security teams

This vulnerability affects Cisco CRS-1 routers running IOS XR when MPLS is enabled. Certain MPLS packets can crash Modular Services Cards or disrupt MPLS packet handling, creating a denial-of-service risk for carrier or backbone routing functions. Exposure is likely limited to organizations operating Cisco CRS-1 routers with IOS XR and MPLS configured. The provided sources do not identify other Cisco platforms, versions, or non-MPLS deployments as affected. Treat this as high priority if CRS-1 MPLS routers are still in service. The business risk is service disruption in routing infrastructure, not data theft. Confirm exposure before emergency action. Mitigation focus: Review Cisco advisory 20060419 for fixed IOS XR releases or vendor mitigations.; Check Cisco bug IDs CSCsd15970 and CSCsd55531 in Cisco support tooling.; Prioritize remediation for MPLS core routers carrying critical traffic..

Prepared

Jun 29, 2026, 13:09 UTC (UTC+00:00)

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