CVE-2001-0080: Cisco Catalyst 4000

Medium severity, CVSS 5.0. EPSS: 8.9% chance of exploitation in the next 30 days.

Cisco Catalyst 6000, 5000, or 4000 switches allow remote attackers to cause a denial of service by connecting to the SSH service with a non-SSH client, which generates a protocol mismatch error.

Affected products

  • Cisco Catalyst 4000: any version
  • Cisco Catalyst 5000: any version
  • Cisco Catalyst 6000: any version

Published 2001-02-12. Last modified 2026-06-16.