CVE-2013-6694: Cisco IOS

Medium severity, CVSS 4.3. EPSS: 1.1% chance of exploitation in the next 30 days.

The IPSec implementation in Cisco IOS allows remote attackers to cause a denial of service (MTU change and tunnel-session drop) via crafted ICMP packets, aka Bug ID CSCul29918.

Affected products

• Cisco IOS: affected versions not specified

Published 2013-11-22. Last modified 2026-06-17.