CVE-1999-0775: Cisco IOS

High severity, CVSS 10.0. EPSS: 3.2% chance of exploitation in the next 30 days.

Cisco Gigabit Switch routers running IOS allow remote attackers to forward unauthorized packets due to improper handling of the "established" keyword in an access list.

Affected products

• Cisco IOS: version 11.2(14)gs2 only; version 11.2(15)g only

Published 1999-06-10. Last modified 2026-06-16.