CVE-2004-1099
CVE-2004-1099 is a critical-severity vulnerability in Cisco Secure Access Control Server with a CVSS 2.0 base score of 10.0. Its EPSS exploit-prediction score of 10% places it in the 95th percentile, indicating an elevated likelihood of exploitation.
Key facts
- Severity: Critical (CVSS 2.0 base score 10.0)
- EPSS exploit prediction: 10% (95th percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Cisco Secure Access Control Server
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2004-1099?
- 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.
- How severe is CVE-2004-1099?
- CVE-2004-1099 has a CVSS 2.0 base score of 10.0, rated critical severity.
- Is CVE-2004-1099 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 10% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2004-1099?
- CVE-2004-1099 primarily affects Cisco Secure Access Control Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2004-1099?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2004-1099 published?
- CVE-2004-1099 was published on 2005-01-10 and last updated on 2026-06-16.
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
Affected products (3)
- cpe:2.3:a:cisco:secure_access_control_server:3.3\(1\):*:*:*:*:*:*:*
- cpe:2.3:a:cisco:secure_access_control_server:3.3.1:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:secure_acs_solution_engine:*:*:*:*:*:*:*:*
More vulnerabilities in Cisco Secure Access Control Server
- CVE-2006-4098 — Critical (CVSS 10.0): Stack-based buffer overflow in the CSRadius service in Cisco Secure Access Control Server (ACS) for Windows before 4.1…
- CVE-2000-1054 — Critical (CVSS 10.0): Buffer overflow in CSAdmin module in CiscoSecure ACS Server 2.4(2) and earlier allows remote attackers to cause a…
- CVE-2000-1055 — Critical (CVSS 10.0): Buffer overflow in CiscoSecure ACS Server 2.4(2) and earlier allows remote attackers to cause a denial of service and…
- CVE-2013-3466 — Critical (CVSS 9.3): The EAP-FAST authentication module in Cisco Secure Access Control Server (ACS) 4.x before 4.2.1.15.11, when a RADIUS…
- CVE-2006-4097 — High (CVSS 7.8): Multiple unspecified vulnerabilities in the CSRadius service in Cisco Secure Access Control Server (ACS) for Windows…
- CVE-2008-2441 — High (CVSS 7.5): Cisco 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…