What is CVE-2004-0747?

CVE-2004-0747 is a high-severity vulnerability in Apache HTTP Server, classified under Incorrect Calculation of Buffer Size. CVSS score: 7.8/10. Published 2004-10-20.

How severe is CVE-2004-0747?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2004-0747 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Apache HTTP Server

CVE-2004-0747

Buffer overflow in Apache 2.0.50 and earlier allows local users to gain apache privileges via a .htaccess file that causes the overflow during expansion of environment variables.

Published 2004-10-20 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.016 (74.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Apache HTTP Server

Weakness classification (CWE)

CWE-131 — Incorrect Calculation of Buffer Size

Public proof-of-concept exploits

Live-Hack-CVE/CVE-2004-0747

References

www.novell.com/linux/security/advisories/2004_32_apache2.html (vendor-advisory, Broken Link)
www.redhat.com/support/errata/RHSA-2004-463.html (vendor-advisory, Third Party Advisory, Broken Link)
exchange.xforce.ibmcloud.com/vulnerabilities/17384 (VDB Entry, Third Party Advisory, vdb-entry)
www.vupen.com/english/advisories/2009/1233 (Permissions Required, vdb-entry, Broken Link)
secunia.com/advisories/12540 (Not Applicable, Broken Link, third-party-advisory)
oval.cisecurity.org/repository/search/definition/oval:org.mitre.oval:def:11561 (Broken Link, signature, Third Party Advisory, vdb-entry)
secunia.com/advisories/34920 (Not Applicable, Broken Link, third-party-advisory)
www.trustix.org/errata/2004/0047/ (vendor-advisory, Broken Link)
www.mandrakesecure.net/en/advisories/advisory.php (vendor-advisory, Broken Link)
support.ca.com/irj/portal/anonymous/phpsupcontent (Broken Link)

Frequently asked questions

What is CVE-2004-0747?: CVE-2004-0747 is a high-severity vulnerability in Apache HTTP Server, classified under Incorrect Calculation of Buffer Size. CVSS score: 7.8/10. Published 2004-10-20.
How severe is CVE-2004-0747?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2004-0747 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.