CVE-2007-0479: Cisco IOS Transmission Control Protocol

High severity, CVSS 7.8. EPSS: 4.5% chance of exploitation in the next 30 days.

Memory leak in the TCP listener in Cisco IOS 9.x, 10.x, 11.x, and 12.x allows remote attackers to cause a denial of service by sending crafted TCP traffic to an IPv4 address on the IOS device.

Affected products

• Cisco IOS Transmission Control Protocol: version 12 only; version 12.0da only; version 12.0db only; version 12.0dc only; version 12.0s only; version 12.0sc only; …

Published 2007-01-25. Last modified 2026-06-16.