CVE-2004-0594

MEDIUMCVSS v2 · 5.15.1—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 5.1 — v2 rates that MEDIUM (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:H/Au:N/C:P/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 54.9% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Triggered by: NVD CVSS v2.0 (legacy fallback)
Sources: epss, nvd_v2
Weaponized
5.1EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 55%
  • Public exploit code is available (Exploit-DB (verified), epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 55%CVSS v2: 5.1Exploit: Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed services: Not assessed

A fix is available — apply it.

The memory_limit functionality in PHP 4.x up to 4.3.7, and 5.x up to 5.0.0RC3, under certain conditions such as when register_globals is enabled, allows remote attackers to execute arbitrary code by triggering a memory_limit abort during execution of the zend_hash_init function and overwriting a HashTable destructor pointer before the initialization of key data structures is complete.

CVSS v2.0 (legacy)
5.1MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
5.1MEDIUMlow confidence
EG Risk
53
EG Risk 53/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity51% × 45%
Exploitation65% × 40%
Automatability30% × 15%
CISA SSVC: Track at low, Track or Track* at medium and Track* or Attend at high mission impact.
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
55%
EPSS %ILE
99th
KEV
Not listed

CISA SSVCTrack at low, Track or Track* at medium and Track* or 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 (EG-KEV: weaponized) · Automatable unknown (not published for this CVE) · Technical impact unknown (not published for this CVE). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 27, 2004

Last Modified

June 16, 2026

References (38)

Patch Availability(4)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatpatch2005-11-02redhat
redhatpatch2004-07-23redhat
redhatphp-0:4.3.2-11.1.ent2004-07-19redhat
redhatpatch2004-07-19redhat

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

(2 across 1 ecosystem)
Debian:3.0(2)
PackageVulnerable rangeFix by version rangeDependents
php33:3.0.18-23.1woody1
  • every version up to 3:3.0.18-23.1woody2: fixed in 3:3.0.18-23.1woody2
—
php4—
  • every version up to 4.1.2-7: fixed in 4.1.2-7
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(4)

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 / 7× 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. 2026-10-09 19:58 UTCEPSS rescore
  2. 2026-10-07 23:35 UTCEPSS rescore
  3. 2026-10-06 15:08 UTCEPSS rescore
  4. 2026-10-03 14:19 UTCEPSS rescore
  5. 2026-09-29 02:40 UTCEG score recompute
  6. 2026-09-12 14:54 UTCEPSS rescore
  7. 2026-09-10 09:23 UTCEPSS rescore
  8. 2026-08-30 01:13 UTCEPSS rescore
  9. 2026-07-26 13:24 UTCEG score recompute▲ 5.10
  10. 2026-07-24 14:11 UTCEPSS rescore
  11. 2026-07-23 00:46 UTCEG score recompute
  12. 2026-07-23 00:27 UTCEG score recompute▼ 4.10
  13. 2026-07-22 23:50 UTCEG score recompute▲ 4.10
  14. 2026-07-22 21:30 UTCEG score recompute
  15. 2026-07-20 17:02 UTCEPSS rescore
  16. 2026-07-19 14:25 UTCEPSS rescore
  17. 2026-07-16 16:58 UTCEPSS rescore
  18. 2026-07-15 01:55 UTCEPSS rescore
  19. 2026-07-15 01:55 UTCEPSS rescore
  20. 2026-07-13 06:07 UTCEPSS rescore
  21. 2026-07-11 08:22 UTCEPSS rescore
  22. 2026-07-11 08:22 UTCEPSS rescore
  23. 2026-07-02 14:00 UTCEPSS rescore
  24. 2026-06-28 04:52 UTCEPSS rescore
  25. 2026-06-27 03:04 UTCEPSS rescore
Show 44 more
  1. 2026-06-23 21:29 UTCEPSS rescore
  2. 2026-06-21 01:56 UTCEPSS rescore
  3. 2026-06-17 17:49 UTCEPSS rescore
  4. 2026-06-17 17:49 UTCEPSS rescore
  5. 2026-06-16 17:49 UTCEPSS rescore
  6. 2026-06-16 17:49 UTCEPSS rescore
  7. 2026-06-15 17:43 UTCEPSS rescore
  8. 2026-06-14 23:13 UTCEPSS rescore
  9. 2026-06-14 23:13 UTCEPSS rescore
  10. 2026-06-13 22:56 UTCEPSS rescore
  11. 2026-06-12 23:08 UTCEPSS rescore
  12. 2026-06-11 13:55 UTCEPSS rescore
  13. 2026-06-10 22:13 UTCEPSS rescore
  14. 2026-06-10 13:17 UTCEPSS rescore
  15. 2026-06-08 14:13 UTCEPSS rescore
  16. 2026-06-07 15:21 UTCEPSS rescore
  17. 2026-06-06 13:44 UTCEPSS rescore
  18. 2026-06-06 13:44 UTCEPSS rescore
  19. 2026-06-06 13:44 UTCEPSS rescore
  20. 2026-06-05 22:43 UTCEPSS rescore
  21. 2026-06-05 22:43 UTCEPSS rescore
  22. 2026-06-05 06:07 UTCEPSS rescore
  23. 2026-06-02 20:10 UTCEPSS rescore
  24. 2026-06-01 13:49 UTCEPSS rescore
  25. 2026-06-01 13:49 UTCEPSS rescore
  26. 2026-05-31 22:28 UTCEPSS rescore
  27. 2026-05-31 16:13 UTCEG score recompute
  28. 2026-05-31 16:13 UTCVendor advisory
  29. 2026-05-31 16:13 UTCGHSA enrichment
  30. 2026-05-31 00:13 UTCEPSS rescore
  31. 2026-05-31 00:13 UTCEPSS rescore
  32. 2026-05-29 13:40 UTCEPSS rescore
  33. 2026-05-29 13:40 UTCEPSS rescore
  34. 2026-05-28 13:42 UTCEPSS rescore
  35. 2026-05-28 13:42 UTCEPSS rescore
  36. 2026-05-28 13:42 UTCEPSS rescore
  37. 2026-05-26 13:41 UTCEPSS rescore
  38. 2026-05-26 13:41 UTCEPSS rescore
  39. 2026-05-26 07:16 UTCEPSS rescore
  40. 2026-05-26 07:16 UTCEPSS rescore
  41. 2026-05-22 21:15 UTCEPSS rescore
  42. 2026-05-20 22:36 UTCEPSS rescore
  43. 2026-05-18 21:29 UTCEPSS rescore
  44. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-660✓ verified
    First seen Nov 27, 2004

    PHP 4.3.7/5.0.0RC3 - 'memory_limit' Remote Overflow

    Open source ↗

Related CVEs(same product + same vendor + same CWE)

Frequently asked(4)

What is CVE-2004-0594?
CVE-2004-0594 is a medium vulnerability published on July 27, 2004. The memorylimit functionality in PHP 4.x up to 4.3.7, and 5.x up to 5.0.0RC3, under certain conditions such as when registerglobals is enabled, allows remote attackers to execute arbitrary code by triggering a memorylimit abort during execution of the zendhash_init function and overwriting a…
When was CVE-2004-0594 disclosed?
CVE-2004-0594 was first published on July 27, 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-2004-0594 actively exploited?
CVE-2004-0594 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model classifies it as weaponized: a functional public exploit exists. FIRST EPSS estimates a 55% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
How do I remediate CVE-2004-0594?
A fix for CVE-2004-0594 is available: update to the fixed version the vendor names in its advisory.

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