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Vulnerability record · CVE-2004-1099 · published 10 January 2005

CVE-2004-1099: Cisco secure access control server vulnerability

Cisco · Secure Access Control Server

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.

10.0 CVSS 2.0 High EPSS 10% · top 4.5%
10.0CVSS 2.0 base score
10%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
8References
16 Jun 2026Last modified by NVD

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.

AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2006-4098Cisco secure access control server vulnerabilityStack-based buffer overflow in the CSRadius service in Cisco Secure Access Control Server (ACS) for Windows before 4.1 and ACS Solution Engine before…EPSS 13%10.0CVE-2000-1054Cisco secure access control server vulnerabilityBuffer overflow in CSAdmin module in CiscoSecure ACS Server 2.4(2) and earlier allows remote attackers to cause a denial of service and possibly exec…EPSS 8.4%10.0CVE-2000-1055Cisco secure access control server vulnerabilityBuffer overflow in CiscoSecure ACS Server 2.4(2) and earlier allows remote attackers to cause a denial of service and possibly execute arbitrary comm…EPSS 4.0%9.3CVE-2013-3466Cisco secure access control server improper authentication vulnerabilityThe EAP-FAST authentication module in Cisco Secure Access Control Server (ACS) 4.x before 4.2.1.15.11, when a RADIUS server configuration is enabled,…EPSS 5.1%7.8CVE-2006-4097Cisco secure access control server vulnerabilityMultiple unspecified vulnerabilities in the CSRadius service in Cisco Secure Access Control Server (ACS) for Windows before 4.1 and ACS Solution Engi…EPSS 4.3%7.5CVE-2008-2441Cisco secure acs vulnerabilityCisco Secure ACS 3.x before 3.3(4) Build 12 patch 7, 4.0.x, 4.1.x before 4.1(4) Build 13 Patch 11, and 4.2.x before 4.2(0) Build 124 Patch 4 does not…EPSS 3.0%7.5CVE-2007-0105Cisco secure access control server vulnerabilityStack-based buffer overflow in the CSAdmin service in Cisco Secure Access Control Server (ACS) for Windows before 4.1 and ACS Solution Engine before …EPSS 11%7.5CVE-2006-3226Cisco secure access control server vulnerabilityCisco Secure Access Control Server (ACS) 4.x for Windows uses the client's IP address and the server's port number to grant access to an HTTP server …EPSS 2.4%

Source: NIST National Vulnerability Database (record CVE-2004-1099), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.