CVE-2009-1154: Cisco IOS XR

Low severity, CVSS 3.3. EPSS: 1.3% chance of exploitation in the next 30 days.

Cisco IOS XR 3.8.1 and earlier allows remote attackers to cause a denial of service (process crash) via a long BGP UPDATE message, as demonstrated by a message with many AS numbers in the AS Path Attribute.

Affected products

• Cisco IOS XR: up to and including 3.8.1; version 3.4 only; version 3.4.0 only; version 3.4.1 only; version 3.4.2 only; version 3.4.3 only; …

Published 2009-08-21. Last modified 2026-06-16.