CVE-2009-0642

MEDIUMCVSS v2 · 6.86.8—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 6.8 — 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:M/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 2.6% 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
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS v2: 6.8Exploit: None knownExposed: 0

A fix is available — apply it.

ext/openssl/ossl_ocsp.c in Ruby 1.8 and 1.9 does not properly check the return value from the OCSP_basic_verify function, which might allow remote attackers to successfully present an invalid X.509 certificate, possibly involving a revoked certificate.

CVSS v2.0 (legacy)
6.8MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
6.8(low)
EG Risk
36(Track)
EG Risk 36/100SSVC: 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
Severity68% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
84%
KEV
Not listed

Published

February 20, 2009

Last Modified

April 23, 2026

References (24)

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibruby1.9 (1.9.0.2-9ubuntu1.1) @ jaunty2026-05-30ubuntu
redhatruby-0:1.8.5-5.el5_3.72009-07-02redhat

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 2 ecosystems)
Debian:4.0(2)
PackageVulnerable rangeFixed inDependents
ruby1.81.8.5-4, 1.8.5-4etch1, 1.8.5-4etch2, 1.8.5-4etch3, 1.8.5-4etch41.8.5-4etch5—
ruby1.91.9.0+20060609-1, 1.9.0+20060609-1etch1, 1.9.0+20060609-1etch2, 1.9.0+20060609-1etch3, 1.9.0+20060609-1etch41.9.0+20060609-1etch5—
Debian:5.0(2)
PackageVulnerable rangeFixed inDependents
ruby1.81.8.7.72-31.8.7.72-3lenny1—
ruby1.91.9.0.2-91.9.0.2-9lenny1—

Weakness Classification(1)

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

All Vendor Advisories

(2)

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 1× 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 112 total refreshes for this CVE.

  1. 2026-08-25 13:43 UTCEPSS rescore
  2. 2026-08-19 16:58 UTCEPSS rescore
  3. 2026-08-15 01:24 UTCEPSS rescore
  4. 2026-08-09 13:41 UTCEPSS rescore
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  8. 2026-07-30 16:22 UTCEPSS rescore
  9. 2026-07-30 01:26 UTCEPSS rescore
  10. 2026-07-26 13:37 UTCEG score recompute▲ 6.80
  11. 2026-07-25 14:12 UTCEPSS rescore
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  13. 2026-07-23 14:14 UTCEPSS rescore
  14. 2026-07-23 00:58 UTCEG score recompute
  15. 2026-07-23 00:36 UTCEG score recompute
  16. 2026-07-23 00:03 UTCEG score recompute
  17. 2026-07-22 21:42 UTCEG score recompute
  18. 2026-07-22 14:03 UTCEPSS rescore
  19. 2026-07-21 15:20 UTCEPSS rescore
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  22. 2026-07-18 09:59 UTCEPSS rescore
  23. 2026-07-16 16:58 UTCEPSS rescore
  24. 2026-07-15 16:54 UTCEPSS rescore
  25. 2026-07-15 16:54 UTCEPSS rescore
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  1. 2026-07-15 01:55 UTCEPSS rescore
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  15. 2026-06-30 23:19 UTCEPSS rescore
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  18. 2026-06-28 04:52 UTCEPSS rescore
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  20. 2026-06-27 03:05 UTCEPSS rescore
  21. 2026-06-25 13:46 UTCEPSS rescore
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  23. 2026-06-24 14:02 UTCEPSS rescore
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  25. 2026-06-23 21:29 UTCEPSS rescore
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  27. 2026-06-22 14:22 UTCEPSS rescore
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  29. 2026-06-21 14:53 UTCEPSS rescore
  30. 2026-06-21 01:56 UTCEPSS rescore
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  32. 2026-06-19 19:22 UTCEPSS rescore
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  34. 2026-06-18 17:49 UTCEPSS rescore
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  40. 2026-06-15 17:44 UTCEPSS rescore
  41. 2026-06-14 23:14 UTCEPSS rescore
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  43. 2026-06-13 22:57 UTCEPSS rescore
  44. 2026-06-12 23:08 UTCEPSS rescore
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  46. 2026-06-10 22:14 UTCEPSS rescore
  47. 2026-06-10 13:17 UTCEPSS rescore
  48. 2026-06-08 14:13 UTCEPSS rescore
  49. 2026-06-07 15:22 UTCEPSS rescore
  50. 2026-06-07 15:22 UTCEPSS rescore
  51. 2026-06-06 13:44 UTCEPSS rescore
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  54. 2026-06-05 22:44 UTCEPSS rescore
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  56. 2026-06-05 06:07 UTCEPSS rescore
  57. 2026-06-04 13:09 UTCEPSS rescore
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  59. 2026-06-02 20:10 UTCEPSS rescore
  60. 2026-06-02 20:10 UTCEPSS rescore
  61. 2026-06-01 13:49 UTCEPSS rescore
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  63. 2026-05-31 22:28 UTCEPSS rescore
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  67. 2026-05-30 18:07 UTCEG score recompute
  68. 2026-05-30 18:07 UTCVendor advisory
  69. 2026-05-30 18:07 UTCGHSA enrichment
  70. 2026-05-29 13:40 UTCEPSS rescore
  71. 2026-05-28 13:42 UTCEPSS rescore
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  74. 2026-05-27 13:38 UTCEPSS rescore
  75. 2026-05-27 13:38 UTCEPSS rescore

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Frequently asked(4)

What is CVE-2009-0642?
CVE-2009-0642 is a medium vulnerability published on February 20, 2009. ext/openssl/osslocsp.c in Ruby 1.8 and 1.9 does not properly check the return value from the OCSPbasic_verify function, which might allow remote attackers to successfully present an invalid X.509 certificate, possibly involving a revoked certificate.
When was CVE-2009-0642 disclosed?
CVE-2009-0642 was first published in the National Vulnerability Database on February 20, 2009, 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-2009-0642 actively exploited?
CVE-2009-0642 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 15.6% of all scored CVEs.
How do I remediate CVE-2009-0642?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-0642, 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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