CVE-2011-4007: Cisco IOS

Medium severity, CVSS 5.4. EPSS: 1.2% chance of exploitation in the next 30 days.

Cisco IOS 15.0 and 15.1 and IOS XE 3.x do not properly handle the "set mpls experimental imposition" command, which allows remote attackers to cause a denial of service (device crash) via network traffic that triggers (1) fragmentation or (2) reassembly, aka Bug ID CSCtr56576.

Affected products

• Cisco IOS: version 15.0 only; version 15.1 only
• Cisco IOS XE: version 3.1.0s only; version 3.1.0sg only; version 3.1.1s only; version 3.1.1sg only; version 3.1.2s only; version 3.1.3s only; …

Published 2012-05-02. Last modified 2026-06-16.