CVE-2002-2316: Cisco Catos

Medium severity, CVSS 5.0. EPSS: 1.2% chance of exploitation in the next 30 days.

Cisco Catalyst 4000 series switches running CatOS 5.5.5, 6.3.5, and 7.1.2 do not always learn MAC addresses from a single initial packet, which causes unicast traffic to be broadcast across the switch and allows remote attackers to obtain sensitive network information by sniffing.

Affected products

• Cisco Catos: version 5.5(5) only; version 6.3(5) only; version 7.1(2) only

Published 2002-12-31. Last modified 2026-06-16.