CVE-2007-3847

MEDIUMCVSS v2 · 5.05.0—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 5.0 — 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:L/Au:N/C:N/I:N/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 12.9% 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
Elevated
5.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 13%CVSS v2: 5.0Exploit: Elevated riskExposed: 0

A fix is available — apply it.

The date handling code in modules/proxy/proxy_util.c (mod_proxy) in Apache 2.3.0, when using a threaded MPM, allows remote origin servers to cause a denial of service (caching forward proxy process crash) via crafted date headers that trigger a buffer over-read.

CVSS v2.0 (legacy)
5.0MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
5.0(low)
EG Risk
43(Track)
EG Risk 43/100SSVC: 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
Severity50% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
13%
EPSS %ILE
96%
KEV
Not listed

Published

August 23, 2007

Last Modified

April 23, 2026

References (164)

Vendor Advisories for CVE-2007-3847(1)

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

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuapache2-mpm-prefork (2.0.55-4ubuntu4.2) @ edgy2026-05-31ubuntu
redhatxml-commons-0:1.3.02-2jpp_1rh2010-08-04redhat
redhathttpd-0:2.0.46-70.ent2008-01-15redhat
redhathttpd-0:2.0.52-38.ent2007-11-15redhat
redhathttpd-0:2.2.3-11.el52007-11-07redhat
redhathttpd-0:2.0.59-1.el4s1.82007-10-25redhat

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
apache2—2.2.6-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
apache2—2.2.6-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
apache2—2.2.6-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
apache2—2.2.6-1—

Weakness Classification(1)

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

Additional Vendor Advisories

(5)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 0× in last 7d / 9× 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.

Showing the most recent 100 of 102 total refreshes for this CVE.

  1. 2026-08-10 13:56 UTCOSV refresh
  2. 2026-08-08 16:30 UTCEPSS rescore
  3. 2026-08-07 16:20 UTCEPSS rescore
  4. 2026-08-06 13:41 UTCEPSS rescore
  5. 2026-08-05 19:11 UTCEPSS rescore
  6. 2026-08-04 15:03 UTCEPSS rescore
  7. 2026-07-30 16:22 UTCEPSS rescore
  8. 2026-07-30 01:25 UTCEPSS rescore
  9. 2026-07-28 15:30 UTCEPSS rescore
  10. 2026-07-26 13:33 UTCEG score recompute▲ 5.00
  11. 2026-07-25 15:00 UTCOSV refresh
  12. 2026-07-25 14:12 UTCEPSS rescore
  13. 2026-07-24 14:11 UTCEPSS rescore
  14. 2026-07-23 14:13 UTCEPSS rescore
  15. 2026-07-23 00:54 UTCEG score recompute
  16. 2026-07-23 00:33 UTCEG score recompute
  17. 2026-07-22 23:58 UTCEG score recompute
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  19. 2026-07-22 14:03 UTCEPSS rescore
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  1. 2026-07-11 08:22 UTCEPSS rescore
  2. 2026-07-08 15:09 UTCEPSS rescore
  3. 2026-07-08 09:35 UTCOSV refresh
  4. 2026-07-06 16:22 UTCEPSS rescore
  5. 2026-07-05 02:26 UTCEPSS rescore
  6. 2026-07-04 06:27 UTCEPSS rescore
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  8. 2026-07-02 14:00 UTCEPSS rescore
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  22. 2026-06-21 14:53 UTCEPSS rescore
  23. 2026-06-21 01:56 UTCEPSS rescore
  24. 2026-06-21 01:56 UTCEPSS rescore
  25. 2026-06-19 21:36 UTCOSV refresh
  26. 2026-06-19 19:22 UTCEPSS rescore
  27. 2026-06-19 19:22 UTCEPSS rescore
  28. 2026-06-18 17:49 UTCEPSS rescore
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  35. 2026-06-15 17:44 UTCEPSS rescore
  36. 2026-06-13 22:57 UTCEPSS rescore
  37. 2026-06-12 23:08 UTCEPSS rescore
  38. 2026-06-10 22:14 UTCEPSS rescore
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  40. 2026-06-07 15:21 UTCEPSS rescore
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  53. 2026-06-01 13:49 UTCEPSS rescore
  54. 2026-05-31 01:13 UTCEG score recompute
  55. 2026-05-31 01:13 UTCVendor advisory
  56. 2026-05-31 01:13 UTCGHSA enrichment
  57. 2026-05-31 00:13 UTCEPSS rescore
  58. 2026-05-31 00:13 UTCEPSS rescore
  59. 2026-05-29 13:40 UTCEPSS rescore
  60. 2026-05-28 16:06 UTCOSV refresh
  61. 2026-05-28 13:42 UTCEPSS rescore
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  74. 2026-05-20 11:20 UTCEPSS rescore
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Frequently asked(4)

What is CVE-2007-3847?
CVE-2007-3847 is a medium vulnerability published on August 23, 2007. The date handling code in modules/proxy/proxyutil.c (modproxy) in Apache 2.3.0, when using a threaded MPM, allows remote origin servers to cause a denial of service (caching forward proxy process crash) via crafted date headers that trigger a buffer over-read.
When was CVE-2007-3847 disclosed?
CVE-2007-3847 was first published in the National Vulnerability Database on August 23, 2007, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2007-3847 actively exploited?
CVE-2007-3847 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 13% probability of exploitation in the next 30 days, which ranks it in the top 4.0% of all scored CVEs.
How do I remediate CVE-2007-3847?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2007-3847, 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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