CVE-2011-3274: Cisco IOS

Medium severity, CVSS 6.1. EPSS: 0.7% chance of exploitation in the next 30 days.

Unspecified vulnerability in Cisco IOS 12.2SRE before 12.2(33)SRE4, 15.0, and 15.1, and IOS XE 2.1.x through 3.3.x, when an MPLS domain is configured, allows remote attackers to cause a denial of service (device crash) via a crafted IPv6 packet, related to an expired MPLS TTL, aka Bug ID CSCto07919.

Affected products

• Cisco IOS: version 12.2(33)sre only; version 12.2(33)sre0a only; version 12.2(33)sre1 only; version 12.2(33)sre2 only; version 12.2(33)sre3 only; version 12.2sre only; …
• Cisco IOS XE: version 2.1.0 only; version 2.1.1 only; version 2.1.2 only; version 2.2.1 only; version 2.2.2 only; version 2.2.3 only; …

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