CVE-2012-1324: Cisco IOS

High severity, CVSS 7.1. EPSS: 1.3% chance of exploitation in the next 30 days.

Race condition in the Zone-Based Firewall in Cisco IOS 15.1 and 15.2, when IPS policies are configured, allows remote attackers to cause a denial of service (device crash) by sending IPv6 packets, aka Bug ID CSCtk53534.

Affected products

• Cisco IOS: version 15.1 only; version 15.2 only

Published 2012-05-03. Last modified 2026-06-16.