What’s Vulnerable › Vulnerabilities

CVE-2004-1099

• Severity: critical (CVSS 10.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 10.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2005-01-10 · updated 2026-06-16

Description

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: 3.3(1), 3.3.1
• Cisco Secure Acs Solution Engine: all versions

References

• http://www.ciac.org/ciac/bulletins/p-028.shtml
• http://www.cisco.com/warp/public/707/cisco-sa-20041102-acs-eap-tls.shtml
• http://www.securityfocus.com/bid/11577
• https://exchange.xforce.ibmcloud.com/vulnerabilities/17936
• http://www.ciac.org/ciac/bulletins/p-028.shtml
• http://www.cisco.com/warp/public/707/cisco-sa-20041102-acs-eap-tls.shtml
• http://www.securityfocus.com/bid/11577
• https://exchange.xforce.ibmcloud.com/vulnerabilities/17936

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