CVE-2013-5474: Cisco IOS

High severity, CVSS 7.8. EPSS: 1.4% chance of exploitation in the next 30 days.

Race condition in the IPv6 virtual fragmentation reassembly (VFR) implementation in Cisco IOS 12.2 through 12.4 and 15.0 through 15.3 allows remote attackers to cause a denial of service (device reload or hang) via fragmented IPv6 packets, aka Bug ID CSCud64812.

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 2013-09-27. Last modified 2026-06-16.