CVE-2011-0943: Cisco IOS XR

High severity, CVSS 7.8. EPSS: 1.2% chance of exploitation in the next 30 days.

Cisco IOS XR 3.8.3, 3.8.4, and 3.9.1 allows remote attackers to cause a denial of service (NetIO process restart or device reload) via a crafted IPv4 packet, aka Bug ID CSCth44147.

Affected products

• Cisco IOS XR: version 3.8.3 only; version 3.8.4 only; version 3.9.1 only

Published 2011-05-31. Last modified 2026-06-16.