CVE-2002-2053: Cisco IOS

Medium severity, CVSS 5.0. EPSS: 1.6% chance of exploitation in the next 30 days.

The design of the Hot Standby Routing Protocol (HSRP), as implemented on Cisco IOS 12.1, when using IRPAS, allows remote attackers to cause a denial of service (CPU consumption) via a router with the same IP address as the interface on which HSRP is running, which causes a loop.

Affected products

• Cisco IOS: version 12.1 only

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