CVE-2012-4557

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 17.5% 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: 17%CVSS v2: 5.0Exploit: Elevated riskExposed: 0

A fix is available — apply it.

The mod_proxy_ajp module in the Apache HTTP Server 2.2.12 through 2.2.21 places a worker node into an error state upon detection of a long request-processing time, which allows remote attackers to cause a denial of service (worker consumption) via an expensive request.

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
17%
EPSS %ILE
97%
KEV
Not listed

Published

November 30, 2012

Last Modified

April 29, 2026

References (46)

Vendor Advisories for CVE-2012-4557(1)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuapache2.2-common (2.2.22-6ubuntu2.2) @ quantal2026-05-29ubuntu
redhathttpd-0:2.2.15-26.el62013-02-20redhat
redhatpatch2011-06-22redhat
redhatxml-commons-0:1.3.04-7.14.ep5.el62011-06-22redhat

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

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
apache2—2.2.22-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
apache2—2.2.22-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
apache2—2.2.22-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
apache2—2.2.22-1—
Debian:6.0(1)
PackageVulnerable rangeFixed inDependents
apache22.2.16-6 ... 2.2.16-6+squeeze8 (11 versions)2.2.16-6+squeeze10—

Additional Vendor Advisories

(3)

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 4× in last 7d / 14× 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 114 total refreshes for this CVE.

  1. 2026-08-24 00:22 UTCOSV refresh
  2. 2026-08-23 00:12 UTCEPSS rescore
  3. 2026-08-21 23:43 UTCEPSS rescore
  4. 2026-08-19 16:59 UTCEPSS rescore
  5. 2026-08-18 13:42 UTCEPSS rescore
  6. 2026-08-16 02:09 UTCEPSS rescore
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  8. 2026-08-08 16:31 UTCEPSS rescore
  9. 2026-08-07 22:26 UTCOSV refresh
  10. 2026-08-07 16:21 UTCEPSS rescore
  11. 2026-08-06 13:41 UTCEPSS rescore
  12. 2026-08-05 19:12 UTCEPSS rescore
  13. 2026-08-04 15:04 UTCEPSS rescore
  14. 2026-07-28 15:31 UTCEPSS rescore
  15. 2026-07-26 13:46 UTCEG score recompute▲ 5.00
  16. 2026-07-25 14:12 UTCEPSS rescore
  17. 2026-07-23 14:14 UTCEPSS rescore
  18. 2026-07-23 01:08 UTCEG score recompute
  19. 2026-07-23 00:11 UTCEG score recompute
  20. 2026-07-22 21:50 UTCEG score recompute
  21. 2026-07-22 15:20 UTCOSV refresh
  22. 2026-07-22 14:04 UTCEPSS rescore
  23. 2026-07-22 14:04 UTCEPSS rescore
  24. 2026-07-21 15:21 UTCEPSS rescore
  25. 2026-07-20 17:03 UTCEPSS rescore
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  1. 2026-07-20 17:03 UTCEPSS rescore
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  5. 2026-07-16 16:58 UTCEPSS rescore
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  8. 2026-07-15 01:56 UTCEPSS rescore
  9. 2026-07-13 22:25 UTCEPSS rescore
  10. 2026-07-13 06:08 UTCEPSS rescore
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  13. 2026-07-08 15:10 UTCEPSS rescore
  14. 2026-07-08 15:10 UTCEPSS rescore
  15. 2026-07-05 10:59 UTCOSV refresh
  16. 2026-07-05 02:26 UTCEPSS rescore
  17. 2026-07-02 14:01 UTCEPSS rescore
  18. 2026-07-01 15:02 UTCEPSS rescore
  19. 2026-06-30 23:19 UTCEPSS rescore
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  21. 2026-06-29 14:02 UTCEPSS rescore
  22. 2026-06-28 14:03 UTCEPSS rescore
  23. 2026-06-28 04:53 UTCEPSS rescore
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  25. 2026-06-27 03:05 UTCEPSS rescore
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  27. 2026-06-25 13:46 UTCEPSS rescore
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  29. 2026-06-24 14:02 UTCEPSS rescore
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  31. 2026-06-23 21:30 UTCEPSS rescore
  32. 2026-06-22 14:22 UTCEPSS rescore
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  34. 2026-06-21 14:53 UTCEPSS rescore
  35. 2026-06-21 01:56 UTCEPSS rescore
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  37. 2026-06-19 19:22 UTCEPSS rescore
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  39. 2026-06-18 17:49 UTCEPSS rescore
  40. 2026-06-18 17:49 UTCEPSS rescore
  41. 2026-06-17 17:49 UTCEPSS rescore
  42. 2026-06-17 17:49 UTCEPSS rescore
  43. 2026-06-16 22:05 UTCOSV refresh
  44. 2026-06-16 17:49 UTCEPSS rescore
  45. 2026-06-16 17:49 UTCEPSS rescore
  46. 2026-06-15 17:44 UTCEPSS rescore
  47. 2026-06-14 23:14 UTCEPSS rescore
  48. 2026-06-14 23:14 UTCEPSS rescore
  49. 2026-06-12 23:08 UTCEPSS rescore
  50. 2026-06-11 13:56 UTCEPSS rescore
  51. 2026-06-10 22:14 UTCEPSS rescore
  52. 2026-06-10 13:18 UTCEPSS rescore
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  62. 2026-06-01 13:49 UTCEPSS rescore
  63. 2026-05-31 22:28 UTCEPSS rescore
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  65. 2026-05-31 00:14 UTCEPSS rescore
  66. 2026-05-31 00:14 UTCEPSS rescore
  67. 2026-05-29 13:41 UTCEPSS rescore
  68. 2026-05-29 01:42 UTCEG score recompute
  69. 2026-05-29 01:42 UTCVendor advisory
  70. 2026-05-29 01:42 UTCGHSA enrichment
  71. 2026-05-28 13:42 UTCEPSS rescore
  72. 2026-05-28 13:42 UTCEPSS rescore
  73. 2026-05-27 13:38 UTCEPSS rescore
  74. 2026-05-27 13:38 UTCEPSS rescore
  75. 2026-05-26 13:41 UTCEPSS rescore

Related CVEs(same vendor)

Frequently asked(4)

What is CVE-2012-4557?
CVE-2012-4557 is a medium vulnerability published on November 30, 2012. The modproxyajp module in the Apache HTTP Server 2.2.12 through 2.2.21 places a worker node into an error state upon detection of a long request-processing time, which allows remote attackers to cause a denial of service (worker consumption) via an expensive request.
When was CVE-2012-4557 disclosed?
CVE-2012-4557 was first published in the National Vulnerability Database on November 30, 2012, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2012-4557 actively exploited?
CVE-2012-4557 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17% probability of exploitation in the next 30 days, which ranks it in the top 3.1% of all scored CVEs.
How do I remediate CVE-2012-4557?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2012-4557, 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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