CVE-2011-0944: Cisco IOS

High severity, CVSS 7.8. EPSS: 1.8% chance of exploitation in the next 30 days.

Cisco IOS 12.4, 15.0, and 15.1 allows remote attackers to cause a denial of service (device reload) via malformed IPv6 packets, aka Bug ID CSCtj41194.

Affected products

• Cisco IOS: version 12.4 only; version 15.0 only; version 15.1 only

Published 2011-10-03. Last modified 2026-06-16.