CVE-1999-1464: Cisco IOS

High severity, CVSS 7.5. EPSS: 1.6% chance of exploitation in the next 30 days.

Vulnerability in Cisco IOS 11.1CC and 11.1CT with distributed fast switching (DFS) enabled allows remote attackers to bypass certain access control lists when the router switches traffic from a DFS-enabled interface to an interface that does not have DFS enabled, as described by Cisco bug CSCdk35564.

Affected products

• Cisco IOS: version 11.1cc only; version 11.1ct only

Published 1999-12-31. Last modified 2026-06-16.