CVE-2001-0041: Cisco Catos

High severity, CVSS 7.8. EPSS: 12.1% chance of exploitation in the next 30 days.

Memory leak in Cisco Catalyst 4000, 5000, and 6000 series switches allows remote attackers to cause a denial of service via a series of failed telnet authentication attempts.

Affected products

• Cisco Catos: version 4.5(2) only; version 4.5(3) only; version 4.5(4) only; version 4.5(5) only; version 4.5(6) only; version 4.5(7) only; …

Published 2001-02-16. Last modified 2026-06-16.