CVE-2011-3297: Cisco Catalyst 6500

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

Cisco Firewall Services Module (aka FWSM) 3.1 before 3.1(21), 3.2 before 3.2(22), 4.0 before 4.0(16), and 4.1 before 4.1(7), when certain authentication configurations are used, allows remote attackers to cause a denial of service (module crash) by making many authentication requests for network access, aka Bug ID CSCtn15697.

Affected products

• Cisco Catalyst 6500
• Cisco Catalyst 7600
• Cisco Firewall Services Module Software: version 3.1 only; version 3.1(2) only; version 3.1(3) only; version 3.1(4) only; version 3.1(5) only; version 3.1(6) only; …

Published 2011-10-06. Last modified 2026-06-16.