CVE-2011-4016: Cisco IOS

Medium severity, CVSS 5.4. EPSS: 1.3% chance of exploitation in the next 30 days.

The PPP implementation in Cisco IOS 12.2 and 15.0 through 15.2, when Point-to-Point Termination and Aggregation (PTA) and L2TP are used, allows remote attackers to cause a denial of service (device crash) via crafted network traffic, aka Bug ID CSCtf71673.

Affected products

• Cisco IOS: version 12.2 only; version 15.0 only; version 15.1 only; version 15.2 only

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