CVE-2001-0929: Cisco IOS

High severity, CVSS 7.5. EPSS: 2.1% chance of exploitation in the next 30 days.

Cisco IOS Firewall Feature set, aka Context Based Access Control (CBAC) or Cisco Secure Integrated Software, for IOS 11.2P through 12.2T does not properly check the IP protocol type, which could allow remote attackers to bypass access control lists.

Affected products

• Cisco IOS: version 11.2p only; version 11.3t only; version 12.0 only; version 12.0t only; version 12.1 only; version 12.1e only; …

Published 2001-11-28. Last modified 2026-06-16.