CVE-1999-0445: Cisco IOS

Medium severity, CVSS 5.0. EPSS: 1.1% chance of exploitation in the next 30 days.

In Cisco routers under some versions of IOS 12.0 running NAT, some packets may not be filtered by input access list filters.

Affected products

• Cisco IOS: version 12.0 only; version 12.0(1)w only; version 12.0(1)xa3 only; version 12.0(1)xb only; version 12.0(1)xe only; version 12.0(2)xc only; …

Published 1999-04-01. Last modified 2026-06-16.