CVE-2014-2109: Cisco IOS

High severity, CVSS 7.8. EPSS: 2.3% chance of exploitation in the next 30 days.

The TCP Input module in Cisco IOS 12.2 through 12.4 and 15.0 through 15.4, when NAT is used, allows remote attackers to cause a denial of service (memory consumption or device reload) via crafted TCP packets, aka Bug IDs CSCuh33843 and CSCuj41494.

Affected products

• Cisco IOS: version 12.2 only; version 12.3 only; version 12.4 only; version 15.0 only; version 15.1 only; version 15.2 only; …

Published 2014-03-27. Last modified 2026-06-17.