CVE-2001-1097: Cisco IOS

Medium severity, CVSS 5.0. EPSS: 4.3% chance of exploitation in the next 30 days.

Cisco routers and switches running IOS 12.0 through 12.2.1 allows a remote attacker to cause a denial of service via a flood of UDP packets.

Affected products

• Cisco IOS: version 12.0 only; version 12.0(1) only; version 12.0(2) only; version 12.0(3) only; version 12.0(4) only; version 12.0(5) only; …

Published 2001-07-24. Last modified 2026-06-16.