CVE-2017-6666: Cisco IOS XR

Medium severity, CVSS 6.0. EPSS: 0.3% chance of exploitation in the next 30 days.

A vulnerability in the forwarding component of Cisco IOS XR Software for Cisco Network Convergence System (NCS) 5500 Series Routers could allow an authenticated, local attacker to cause the router to stop forwarding data traffic across Traffic Engineering (TE) tunnels, resulting in a denial of service (DoS) condition. More Information: CSCvd16665. Known Affected Releases: 6.2.11.BASE. Known Fixed Releases: 6.1.3 6.1.2 6.3.1.8i.BASE 6.2.11.8i.BASE 6.2.2.9i.BASE 6.1.32.11i.BASE 6.1.31.10i.BASE 6.1.4.3i.BASE.

Affected products

• Cisco IOS XR: version 6.0.0 only; version 6.0.1 only; version 6.0_base only; version 6.1.0 only; version 6.1.1 only; version 6.1.2 only; …

Published 2017-06-13. Last modified 2026-06-17.