Heap-based buffer overflow in proxy_util.c for mod_proxy in Apache 1.3.25 to 1.3.31 allows remote attackers to cause a denial of service (process crash) and possibly execute arbitrary code via a negative Content-Length HTTP header field, which causes a large amount of data to be copied.
Conclusion & alert: CVE-2004-0492 is rated High Risk (79.4/100): CVSS Critical severity, with high exploitation likelihood (EPSS 33.64%, 98th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +9.93% over the last day, indicating growing attacker interest. Mandatory action: High exploitation likelihood—assess exposure and prioritize remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 23.71% | 33.64% | +9.93% |
| 2 | 2026-02-26 | 21.04% | 23.71% | +2.68% |
| 3 | 2025-12-28 | — | 21.04% | — |
Full EPSS history (18 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 10.0 | 2.0 | HIGH |
|
10.0 | 10.0 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2004-0492 |
ubuntu
|
medium | CVE-2004-0492 medium priority: Ubuntu including 1 source packages (apache), 4 status rows across 4 suites (dapper, edgy, feisty, upstream): released 3, needs-triage 1. | https://ubuntu.com/security/CVE-2004-0492 |
Fixed in Apache HTTP Server 1.3.32: http://httpd.apache.org/security/vulnerabilities_13.html
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| apache | http_server | 1.3.26 | cpe:2.3:a:apache:http_server:1.3.26:*:*:*:*:*:*:* |
| apache | http_server | 1.3.27 | cpe:2.3:a:apache:http_server:1.3.27:*:*:*:*:*:*:* |
| apache | http_server | 1.3.28 | cpe:2.3:a:apache:http_server:1.3.28:*:*:*:*:*:*:* |
| apache | http_server | 1.3.29 | cpe:2.3:a:apache:http_server:1.3.29:*:*:*:*:*:*:* |
| apache | http_server | 1.3.31 | cpe:2.3:a:apache:http_server:1.3.31:*:*:*:*:*:*:* |
| hp | virtualvault | 11.0.4 | cpe:2.3:a:hp:virtualvault:11.0.4:*:*:*:*:*:*:* |
| hp | webproxy | 2.0 | cpe:2.3:a:hp:webproxy:2.0:*:*:*:*:*:*:* |
| hp | webproxy | 2.1 | cpe:2.3:a:hp:webproxy:2.1:*:*:*:*:*:*:* |
| ibm | http_server | 1.3.26 | cpe:2.3:a:ibm:http_server:1.3.26:*:*:*:*:*:*:* |
| ibm | http_server | 1.3.26.1 | cpe:2.3:a:ibm:http_server:1.3.26.1:*:*:*:*:*:*:* |
| ibm | http_server | 1.3.26.2 | cpe:2.3:a:ibm:http_server:1.3.26.2:*:*:*:*:*:*:* |
| ibm | http_server | 1.3.28 | cpe:2.3:a:ibm:http_server:1.3.28:*:*:*:*:*:*:* |
| sgi | propack | 2.4 | cpe:2.3:a:sgi:propack:2.4:*:*:*:*:*:*:* |
| hp | vvos | 11.04 | cpe:2.3:o:hp:vvos:11.04:*:*:*:*:*:*:* |
| openbsd | openbsd | — | cpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:* |
| openbsd | openbsd | 3.4 | cpe:2.3:o:openbsd:openbsd:3.4:*:*:*:*:*:*:* |
| openbsd | openbsd | 3.5 | cpe:2.3:o:openbsd:openbsd:3.5:*:*:*:*:*:*:* |