CVE-2004-0493

NONECVSS 0.09.0▲
EchelonGraph scoreLOW confidence

Score elevated to 9.0 because EPSS predicts 90% probability of exploitation within the next 30 days (top 0.4% of all CVEs). Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss
Weaponized
0.0
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 85%
CISA-KEV: Not listedEPSS: 85%CVSS: —Exploit: NoneExposed: 0

A fix is available — apply it.

The ap_get_mime_headers_core function in Apache httpd 2.0.49 allows remote attackers to cause a denial of service (memory exhaustion), and possibly an integer signedness error leading to a heap-based buffer overflow on 64 bit systems, via long header lines with large numbers of space or tab characters.

CVSS v3
—
EG Score
9.0(low)
EPSS
99.7%
KEV
Not listed

Published

August 6, 2004

Last Modified

June 16, 2026

References (48)

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhathttpd-0:2.0.46-32.ent.32004-07-06redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 4× in last 7d / 12× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-13 06:07 UTCEPSS rescore
  2. 2026-07-11 08:22 UTCEPSS rescore
  3. 2026-07-11 08:22 UTCEPSS rescore
  4. 2026-07-09 09:16 UTCOSV refresh
  5. 2026-06-28 04:52 UTCEPSS rescore
  6. 2026-06-23 21:29 UTCEPSS rescore
  7. 2026-06-20 21:42 UTCOSV refresh
  8. 2026-06-17 17:49 UTCEPSS rescore
  9. 2026-06-17 17:49 UTCEPSS rescore
  10. 2026-06-16 17:49 UTCEPSS rescore
  11. 2026-06-16 17:49 UTCEPSS rescore
  12. 2026-06-15 17:43 UTCEPSS rescore
  13. 2026-06-13 22:56 UTCEPSS rescore
  14. 2026-06-10 22:13 UTCEPSS rescore
  15. 2026-06-05 22:43 UTCEPSS rescore
  16. 2026-06-05 22:43 UTCEPSS rescore
  17. 2026-05-31 16:05 UTCEG score recompute
  18. 2026-05-31 16:05 UTCVendor advisory
  19. 2026-05-31 16:05 UTCGHSA enrichment
  20. 2026-05-31 00:13 UTCEPSS rescore
  21. 2026-05-31 00:13 UTCEPSS rescore
  22. 2026-05-27 21:35 UTCOSV refresh
  23. 2026-05-20 22:36 UTCEPSS rescore
  24. 2026-05-18 21:29 UTCEPSS rescore
  25. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-371✓ verified
    First seen Aug 2, 2004

    Apache - Arbitrary Long HTTP Headers Denial of Service

    Open source ↗
  • Exploit-DBEDB-360✓ verified
    First seen Jul 22, 2004

    Apache - Arbitrary Long HTTP Headers (Denial of Service)

    Open source ↗

Frequently asked(4)

What is CVE-2004-0493?
CVE-2004-0493 is a none vulnerability published on August 6, 2004. The apgetmimeheaderscore function in Apache httpd 2.0.49 allows remote attackers to cause a denial of service (memory exhaustion), and possibly an integer signedness error leading to a heap-based buffer overflow on 64 bit systems, via long header lines with large numbers of space or tab characters.
When was CVE-2004-0493 disclosed?
CVE-2004-0493 was first published in the National Vulnerability Database on August 6, 2004, with the most recent update on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2004-0493 actively exploited?
CVE-2004-0493 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2004-0493?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2004-0493, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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