CVE-2001-0429: Cisco Catos

Medium severity, CVSS 5.0. EPSS: 1.4% chance of exploitation in the next 30 days.

Cisco Catalyst 5000 series switches 6.1(2) and earlier will forward an 802.1x frame on a Spanning Tree Protocol (STP) blocked port, which causes a network storm and a denial of service.

Affected products

• Cisco Catos: version 4.5(11) only; version 4.5.10 only; version 5.5(4b) only; version 5.5(6) only; version 6.1(1c) only; version 6.1(2) only; …

Published 2001-07-02. Last modified 2026-06-16.