CVE-2004-1099: Cisco Secure Access Control Server

High severity, CVSS 10.0. EPSS: 10.2% chance of exploitation in the next 30 days.

Cisco Secure Access Control Server for Windows (ACS Windows) and Cisco Secure Access Control Server Solution Engine (ACS Solution Engine) 3.3.1, when the EAP-TLS protocol is enabled, does not properly handle expired or untrusted certificates, which allows remote attackers to bypass authentication and gain unauthorized access via a "cryptographically correct" certificate with valid fields such as the username.

Affected products

• Cisco Secure Access Control Server: version 3.3(1) only; version 3.3.1 only
• Cisco Secure ACS Solution Engine: any version

Published 2005-01-10. Last modified 2026-06-16.