CVE-2004-0493

MEDIUMCVSS v2 · 6.46.4
EchelonGraph scoreLOW confidence

“—” beside the score: it is equal to NVD's CVSS v2 base score.

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 6.4 — NVD rates that MEDIUM (NVD's v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; no CRITICAL band). Vector AV:N/AC:L/Au:N/C:N/I:P/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 85% exploitation probability in the next 30 days; it does not lift the v2 base. EPSS sets EG Risk's exploitation input. Confidence: LOW.

Triggered by: NVD CVSS v2.0 (legacy fallback)
Sources: NVD CVSS v2.0
Weaponized

Also known asEUVD-2004-0492 (ENISA EUVD) · GHSA-jc6w-8vm4-hvp8 (GitHub Security Advisories)Source: ENISA EUVD

6.4EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High exploitation likelihood — EPSS 85%
  • Public exploit code is available (Exploit-DB, marked verified by Exploit-DB)
CISA-KEV: Not listedEPSS PROB: 85%CVSS v2: 6.4Exploit: Exploit-DB (verified)Exposed services: Not assessed

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 v2.0 (legacy)
6.4MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
6.4MEDIUMlow confidence
EG Risk
63
EG Risk 63/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity64% × 45%
Impact severity (EG Severity): CVSS 6.4 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation85% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
85%
EPSS %ILE
99th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.4): severity, escalated by confirmed exploitation. This CVE's 6.4 is its impact severity (EG Severity), not escalated.

EG Severity
6.4 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v2.0 · CVSS v2.0AV:N/AC:L/Au:N/C:N/I:P/A:P
EG Likelihood
85% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-10). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 6, 2004

Last Modified

June 16, 2026

References (24)

15 of 24 shown · show the other 9

Vendor Advisories for CVE-2004-0493(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFix (by version range) / 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.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.0.50-1: fixed in 2.0.50-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.0.50-1: fixed in 2.0.50-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.0.50-1: fixed in 2.0.50-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
apache2—
  • every version up to 2.0.50-1: fixed in 2.0.50-1
—

Data Freshness Timeline

(refreshed 5× in last 7d / 17× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 6 repeat rows among the latest 71 are merged into the row they repeat.

  1. 2026-11-13 16:25 UTCEPSS rescoreEPSS 85% · 99th percentile
  2. 2026-11-11 16:24 UTCEPSS rescoreEPSS 85% · 99th percentile
  3. 2026-11-11 05:43 UTCEchelonGraph re-scored
  4. 2026-11-11 05:43 UTCVendor advisory
  5. 2026-11-11 05:43 UTCGHSA enrichmentGHSA-jc6w-8vm4-hvp8 · GitHub severity MODERATE
  6. 2026-11-10 16:25 UTCEPSS rescoreEPSS 85% · 99th percentile
  7. 2026-11-08 02:46 UTCGHSA enrichmentGHSA-jc6w-8vm4-hvp8 · GitHub severity MODERATE
  8. 2026-11-08 02:46 UTCEchelonGraph re-scored
  9. 2026-11-07 16:25 UTCEPSS rescoreEPSS 85% · 99th percentile
  10. 2026-11-04 16:25 UTCEPSS rescoreEPSS 85% · 99th percentile
  11. 2026-10-30 16:24 UTCEPSS rescoreEPSS 85% · 99th percentile
  12. 2026-10-28 16:25 UTCEPSS rescoreEPSS 85% · 99th percentile
  13. 2026-10-27 10:55 UTCOSV refresh
  14. 2026-10-25 20:50 UTCEchelonGraph re-scored
  15. 2026-10-25 16:24 UTCEPSS rescoreEPSS 85% · 99th percentile
  16. 2026-10-24 16:25 UTCEPSS rescoreEPSS 85% · 99th percentile
  17. 2026-10-22 16:24 UTCEPSS rescoreEPSS 85% · 99th percentile
  18. 2026-10-21 16:24 UTCEPSS rescoreEPSS 85% · 99th percentile
  19. 2026-10-20 16:24 UTCEPSS rescoreEPSS 85% · 99th percentile
  20. 2026-10-18 12:20 UTCEchelonGraph re-scored
  21. 2026-10-17 16:25 UTCEPSS rescoreEPSS 85% · 99th percentile
  22. 2026-10-14 16:25 UTCEPSS rescoreEPSS 85% · 99th percentile
  23. 2026-10-13 16:25 UTCEPSS rescoreEPSS 85% · 99th percentile
  24. 2026-10-12 21:24 UTCEchelonGraph re-scored
  25. 2026-10-12 21:24 UTCVendor advisory
Show 40 more
  1. 2026-10-12 21:23 UTCGHSA enrichmentGHSA-jc6w-8vm4-hvp8
  2. 2026-10-12 02:23 UTCEchelonGraph re-scored
  3. 2026-10-09 19:58 UTCEPSS rescoreEPSS 85% · 99th percentile
  4. 2026-10-08 16:28 UTCEPSS rescoreEPSS 85% · 99th percentile
  5. 2026-10-07 23:35 UTCEPSS rescoreEPSS 85% · 99th percentile
  6. 2026-10-06 15:08 UTCEPSS rescoreEPSS 85% · 99th percentile
  7. 2026-10-05 20:06 UTCOSV refresh
  8. 2026-09-29 02:40 UTCEchelonGraph re-scored
  9. 2026-09-16 03:24 UTCOSV refresh
  10. 2026-09-10 09:23 UTCEPSS rescoreEPSS 85% · 99th percentile
  11. 2026-08-28 01:21 UTCOSV refresh
  12. 2026-08-11 15:03 UTCOSV refresh
  13. 2026-07-26 15:17 UTCOSV refresh
  14. 2026-07-26 13:24 UTCEchelonGraph re-scoredAssessed again: 6.4 MEDIUM
  15. 2026-07-24 14:11 UTCEPSS rescoreEPSS 85% · 99th percentile
  16. 2026-07-23 00:46 UTCEchelonGraph re-scored
  17. 2026-07-23 00:27 UTCEchelonGraph re-scored▼ 9.00
  18. 2026-07-22 23:50 UTCEchelonGraph re-scoredFirst assessed: 9.0 CRITICAL
  19. 2026-07-22 21:30 UTCEchelonGraph re-scored▼ 9.00
  20. 2026-07-20 17:02 UTCEPSS rescoreEPSS 85% · 99th percentile
  21. 2026-07-16 16:58 UTCEPSS rescoreEPSS 85% · 99th percentile
  22. 2026-07-13 06:07 UTCEPSS rescoreEPSS 85% · 99th percentile
  23. 2026-07-11 08:22 UTCEPSS rescoreEPSS 85% · 99th percentile
  24. 2026-07-09 09:16 UTCOSV refresh
  25. 2026-06-28 04:52 UTCEPSS rescoreEPSS 85% · 99th percentile
  26. 2026-06-23 21:29 UTCEPSS rescoreEPSS 85% · 99th percentile
  27. 2026-06-20 21:42 UTCOSV refresh
  28. 2026-06-17 17:49 UTCEPSS rescoreEPSS 85% · 99th percentile
  29. 2026-06-16 17:49 UTCEPSS rescoreEPSS 85% · 99th percentile
  30. 2026-06-15 17:43 UTCEPSS rescoreEPSS 85% · 99th percentile
  31. 2026-06-13 22:56 UTCEPSS rescoreEPSS 90% · 99th percentile
  32. 2026-06-10 22:13 UTCEPSS rescoreEPSS 90% · 99th percentile
  33. 2026-06-05 22:43 UTCEPSS rescoreEPSS 90% · 99th percentile
  34. 2026-05-31 16:05 UTCEchelonGraph re-scored
  35. 2026-05-31 16:05 UTCVendor advisory
  36. 2026-05-31 16:05 UTCGHSA enrichmentGHSA-jc6w-8vm4-hvp8
  37. 2026-05-31 00:13 UTCEPSS rescoreEPSS 90% · 99th percentile
  38. 2026-05-27 21:35 UTCOSV refresh
  39. 2026-05-20 22:36 UTCEPSS rescoreEPSS 90% · 99th percentile
  40. 2026-05-18 21:29 UTCEPSS rescoreEPSS 90% · 99th percentile

Publicly available exploits

(2 references)

Public exploit code is referenced for this CVE (2 Exploit-DB entries). Defenders should treat patch urgency accordingly.

  • Exploit-DBEDB-371✓ verified
    Published Aug 2, 2004

    Apache - Arbitrary Long HTTP Headers Denial of Service

    Open source ↗
  • Exploit-DBEDB-360✓ verified
    Published 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 medium-severity vulnerability; its CVE record was published on August 6, 2004. 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…
When was CVE-2004-0493 made public?
CVE-2004-0493 was made public on June 28, 2004: that is the date its CVE record's CNA, MITRE Corporation, gives for when the vulnerability was made public. The CVE record itself was published on August 6, 2004. EchelonGraph's copy of the record carries a last-modified date of June 16, 2026; the record at its source may have been updated since.
Is CVE-2004-0493 actively exploited?
CVE-2004-0493 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model places it in Tier 2 (Weaponized), which is not evidence of exploitation: Exploit-DB marks a public exploit for it as verified. EchelonGraph does not test whether exploit code works. FIRST EPSS estimates a 85% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
How do I remediate CVE-2004-0493?
A fix for CVE-2004-0493 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2004-0493 are linked in the Vendor Advisories panel on this page.

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