CVE-2004-0541

HIGHCVSS v2 · 10.010.0—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 10.0 — v2 rates that HIGH (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:L/Au:N/C:C/I:C/A:C. 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 71.1% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
Weaponized
10.0EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 71%
  • Public exploit code is available (Metasploit, Exploit-DB (verified), epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 71%CVSS v2: 10.0Exploit: Metasploit · Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed: 0

A fix is available — apply it.

Buffer overflow in the ntlm_check_auth (NTLM authentication) function for Squid Web Proxy Cache 2.5.x and 3.x, when compiled with NTLM handlers enabled, allows remote attackers to execute arbitrary code via a long password ("pass" variable).

CVSS v2.0 (legacy)
10.0HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
10.0(low)
EG Risk
78(Track)
EG Risk 78/100SSVC: Track

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
Severity100% × 45%
Exploitation71% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
71%
EPSS %ILE
99%
KEV
Not listed

Published

August 6, 2004

Last Modified

June 16, 2026

References (22)

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatsquid-7:2.5.STABLE3-6.3E2004-06-09redhat

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 rangeFixed inDependents
squid—2.5.5-5—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
squid—2.5.5-5—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
squid—2.5.5-5—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
squid—2.5.5-5—

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 0× in last 7d / 5× 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. 2026-09-16 02:54 UTCOSV refresh
  2. 2026-09-12 14:54 UTCEPSS rescore
  3. 2026-09-10 09:23 UTCEPSS rescore
  4. 2026-08-30 01:13 UTCEPSS rescore
  5. 2026-08-28 01:09 UTCOSV refresh
  6. 2026-08-11 14:33 UTCOSV refresh
  7. 2026-07-26 14:47 UTCOSV refresh
  8. 2026-07-26 13:24 UTCEG score recompute▲ 10.00
  9. 2026-07-25 14:11 UTCEPSS rescore
  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▼ 6.70
  13. 2026-07-22 23:50 UTCEG score recompute▲ 6.70
  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. 2026-07-18 09:59 UTCEPSS rescore
  18. 2026-07-18 09:59 UTCEPSS rescore
  19. 2026-07-16 16:58 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. 2026-07-09 09:15 UTCOSV refresh
  24. 2026-07-02 14:00 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. 2026-06-20 21:42 UTCOSV refresh
  4. 2026-06-18 17:49 UTCEPSS rescore
  5. 2026-06-18 17:49 UTCEPSS rescore
  6. 2026-06-17 17:49 UTCEPSS rescore
  7. 2026-06-17 17:49 UTCEPSS rescore
  8. 2026-06-16 17:49 UTCEPSS rescore
  9. 2026-06-16 17:49 UTCEPSS rescore
  10. 2026-06-15 17:43 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. 2026-06-08 14:13 UTCEPSS rescore
  15. 2026-06-07 15:21 UTCEPSS rescore
  16. 2026-06-06 13:44 UTCEPSS rescore
  17. 2026-06-06 13:44 UTCEPSS rescore
  18. 2026-06-06 13:44 UTCEPSS rescore
  19. 2026-06-05 22:43 UTCEPSS rescore
  20. 2026-06-05 22:43 UTCEPSS rescore
  21. 2026-06-05 06:07 UTCEPSS rescore
  22. 2026-06-04 13:09 UTCEPSS rescore
  23. 2026-06-01 13:49 UTCEPSS rescore
  24. 2026-06-01 13:49 UTCEPSS rescore
  25. 2026-05-31 22:28 UTCEPSS rescore
  26. 2026-05-31 16:07 UTCEG score recompute
  27. 2026-05-31 16:07 UTCVendor advisory
  28. 2026-05-31 16:07 UTCGHSA enrichment
  29. 2026-05-31 00:13 UTCEPSS rescore
  30. 2026-05-31 00:13 UTCEPSS rescore
  31. 2026-05-29 13:40 UTCEPSS rescore
  32. 2026-05-29 13:40 UTCEPSS rescore
  33. 2026-05-28 13:42 UTCEPSS rescore
  34. 2026-05-28 13:42 UTCEPSS rescore
  35. 2026-05-28 13:42 UTCEPSS rescore
  36. 2026-05-28 10:03 UTCOSV refresh
  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

(3 references)

Working exploit code is in the public domain (1 Metasploit module) (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-16847✓ verified
    First seen Apr 30, 2010

    Squid - NTLM (Authenticated) Overflow (Metasploit)

    Open source ↗
  • Exploit-DBEDB-9951✓ verified
    First seen Jun 8, 2004

    Squid 2.5.x/3.x - NTLM Buffer Overflow (Metasploit)

    Open source ↗
  • Metasploitexploit/linux/proxy/squid_ntlm_authenticate✓ verified
    First seen Jun 8, 2004

    Squid NTLM Authenticate Overflow

    Open source ↗

Related CVEs(same product)

Frequently asked(4)

What is CVE-2004-0541?
CVE-2004-0541 is a high vulnerability published on August 6, 2004. Buffer overflow in the ntlmcheckauth (NTLM authentication) function for Squid Web Proxy Cache 2.5.x and 3.x, when compiled with NTLM handlers enabled, allows remote attackers to execute arbitrary code via a long password ("pass" variable).
When was CVE-2004-0541 disclosed?
CVE-2004-0541 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-2004-0541 actively exploited?
CVE-2004-0541 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 71% probability of exploitation in the next 30 days, which ranks it in the top 0.6% of all scored CVEs.
How do I remediate CVE-2004-0541?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2004-0541, 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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2004-0541

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