CVE-2001-0861: Cisco 12000 Router

Medium severity, CVSS 5.0. EPSS: 1.7% chance of exploitation in the next 30 days.

Cisco 12000 with IOS 12.0 and line cards based on Engine 2 and earlier allows remote attackers to cause a denial of service (CPU consumption) by flooding the router with traffic that generates a large number of ICMP Unreachable replies.

Affected products

• Cisco 12000 Router: any version

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