CVE-2004-1099: Critical – Cisco Secure Access Control Server for Windows (ACS Windows) and

◆ SAGE Intelligence — CITED Relevance Research Team

This vulnerability was disclosed in 2005. A critical vulnerability affects Cisco systems (CVE-2004-1099). No public exploit code is currently available. Isolate affected systems if patching is not feasible.

BSID: BS-2005-GLOBAL-007204-C • Model: rule-based-v1 • Confidence: MEDIUM

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Frequently Asked Questions

What is CVE-2004-1099?

This vulnerability was disclosed in 2005. A critical vulnerability affects Cisco systems (CVE-2004-1099). No public exploit code is currently available. Isolate affected systems if patching is not feasible.

What is the CVSS score for CVE-2004-1099?

CVE-2004-1099 has CVSS 10.0 (Critical). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C. EPSS: 10.2%.

Is CVE-2004-1099 actively exploited?

No confirmed active exploitation of CVE-2004-1099 as of 2026-05-30.

How do I remediate CVE-2004-1099?

Priority: MEDIUM. Advisory: http://www.ciac.org/ciac/bulletins/p-028.shtml PSIRT: [email protected]

What systems are affected by CVE-2004-1099?

CVE-2004-1099 affects: Cisco, Cisco.

Vulnerability Details

CVE ID	`CVE-2004-1099`
BSID	`BS-2005-GLOBAL-007204-C` BreachSpider Global ID
CVSS Vector	`AV:N/AC:L/Au:N/C:C/I:C/A:C`
Published	2005-01-10
Last Modified	2026-04-16
ICS Relevance	55%
Domains	NETWORK-INFRA
Source	NVD

Official 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.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

Vulnerability details: 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. CVSS vector: AV:N/AC:L/Au:N/C:C/I:C/A:C.

Exploitation Likelihood: LOW

Affected Products

Vendor	Product	Fixed Version
Cisco	Secure Access Control Server	—
Cisco	Secure Acs Solution Engine	—

Remediation

View Vendor Advisory →

Remediation Priority: MEDIUM

Vendor PSIRT: [email protected]

Threat Intelligence

● Threat Intelligence Validated: August 2026 | Threat Age: 7877 Days

CISA KEV	Not in KEV catalog
Public Exploit	Not confirmed
PoC Code	Not confirmed

SAGE Enrichment Record — provenance & audit hash

Model	`rule-based-v1`
Confidence	MEDIUM
Enriched At	2026-05-24
SHA-512 Audit Hash	`da2d4c20444387c9ab38b04d96304b2bd4550bcb722ea6e667a933da6fe6e90a86b094734e89af77f990b421ef9d5302677040e819d899e9e89f6924b1503749`

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