CVE-2009-3767

MEDIUMCVSS v2 · 4.34.3—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 4.3 — 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:N/I:P/A:N. 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 3.1% 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
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS v2: 4.3Exploit: None knownExposed: 0

A fix is available — apply it.

libraries/libldap/tls_o.c in OpenLDAP 2.2 and 2.4, and possibly other versions, when OpenSSL is used, does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

CVSS v2.0 (legacy)
4.3MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
4.3(low)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity43% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
87%
KEV
Not listed

Published

October 23, 2009

Last Modified

April 23, 2026

References (32)

Vendor Advisories for CVE-2009-3767(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
ubuntulibldap-2.2-7 (2.2.26-5ubuntu2.9) @ dapper2026-05-30ubuntu
redhatpatch2011-06-22redhat
redhatopenldap-0:2.2.13-12.el4_8.32010-07-20redhat
redhatopenldap-0:2.3.43-12.el52010-03-29redhat

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

(6 across 6 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
openldap—2.4.17-2.1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
openldap—2.4.17-2.1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
openldap—2.4.17-2.1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
openldap—2.4.17-2.1—
Debian:4.0(1)
PackageVulnerable rangeFixed inDependents
openldap2.32.3.30-5, 2.3.30-5+etch1, 2.3.30-5+etch22.3.30-5+etch3—
Debian:5.0(1)
PackageVulnerable rangeFixed inDependents
openldap2.4.11-12.4.11-1+lenny1—

Weakness Classification(1)

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

Additional Vendor Advisories

(4)

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 2× in last 7d / 10× 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 118 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 19:39 UTCOSV refresh
  5. 2026-08-09 13:41 UTCEPSS rescore
  6. 2026-08-08 16:31 UTCEPSS rescore
  7. 2026-08-06 13:41 UTCEPSS rescore
  8. 2026-08-03 10:28 UTCEPSS rescore
  9. 2026-07-30 16:22 UTCEPSS rescore
  10. 2026-07-30 01:26 UTCEPSS rescore
  11. 2026-07-26 13:39 UTCEG score recompute▲ 4.30
  12. 2026-07-25 14:12 UTCEPSS rescore
  13. 2026-07-24 20:11 UTCOSV refresh
  14. 2026-07-24 14:12 UTCEPSS rescore
  15. 2026-07-23 14:14 UTCEPSS rescore
  16. 2026-07-23 01:00 UTCEG score recompute
  17. 2026-07-23 00:37 UTCEG score recompute
  18. 2026-07-23 00:04 UTCEG score recompute
  19. 2026-07-22 21:43 UTCEG score recompute
  20. 2026-07-22 14:03 UTCEPSS rescore
  21. 2026-07-21 15:20 UTCEPSS rescore
  22. 2026-07-20 17:03 UTCEPSS rescore
  23. 2026-07-20 17:03 UTCEPSS rescore
  24. 2026-07-18 09:59 UTCEPSS rescore
  25. 2026-07-16 16:58 UTCEPSS rescore
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  1. 2026-07-15 16:54 UTCEPSS rescore
  2. 2026-07-15 16:54 UTCEPSS rescore
  3. 2026-07-15 01:55 UTCEPSS rescore
  4. 2026-07-13 22:25 UTCEPSS rescore
  5. 2026-07-13 06:07 UTCEPSS rescore
  6. 2026-07-11 08:22 UTCEPSS rescore
  7. 2026-07-11 08:22 UTCEPSS rescore
  8. 2026-07-09 19:04 UTCEPSS rescore
  9. 2026-07-08 15:10 UTCEPSS rescore
  10. 2026-07-07 15:12 UTCOSV refresh
  11. 2026-07-06 16:23 UTCEPSS rescore
  12. 2026-07-06 02:19 UTCEPSS rescore
  13. 2026-07-06 02:19 UTCEPSS rescore
  14. 2026-07-05 02:26 UTCEPSS rescore
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  16. 2026-07-04 06:27 UTCEPSS rescore
  17. 2026-07-01 15:02 UTCEPSS rescore
  18. 2026-06-30 23:19 UTCEPSS rescore
  19. 2026-06-29 14:02 UTCEPSS rescore
  20. 2026-06-29 14:02 UTCEPSS rescore
  21. 2026-06-28 14:03 UTCEPSS rescore
  22. 2026-06-28 04:52 UTCEPSS rescore
  23. 2026-06-28 04:52 UTCEPSS rescore
  24. 2026-06-27 03:05 UTCEPSS rescore
  25. 2026-06-25 13:46 UTCEPSS rescore
  26. 2026-06-25 13:46 UTCEPSS rescore
  27. 2026-06-24 14:02 UTCEPSS rescore
  28. 2026-06-24 14:02 UTCEPSS rescore
  29. 2026-06-23 21:29 UTCEPSS rescore
  30. 2026-06-23 21:29 UTCEPSS rescore
  31. 2026-06-22 14:22 UTCEPSS rescore
  32. 2026-06-22 14:22 UTCEPSS rescore
  33. 2026-06-21 14:53 UTCEPSS rescore
  34. 2026-06-21 01:56 UTCEPSS rescore
  35. 2026-06-21 01:56 UTCEPSS rescore
  36. 2026-06-19 19:22 UTCEPSS rescore
  37. 2026-06-19 19:22 UTCEPSS rescore
  38. 2026-06-19 02:43 UTCOSV refresh
  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 17:49 UTCEPSS rescore
  44. 2026-06-16 17:49 UTCEPSS rescore
  45. 2026-06-15 17:44 UTCEPSS rescore
  46. 2026-06-14 23:14 UTCEPSS rescore
  47. 2026-06-14 23:14 UTCEPSS rescore
  48. 2026-06-13 22:57 UTCEPSS rescore
  49. 2026-06-12 23:08 UTCEPSS rescore
  50. 2026-06-12 23:08 UTCEPSS rescore
  51. 2026-06-10 22:14 UTCEPSS rescore
  52. 2026-06-10 13:17 UTCEPSS rescore
  53. 2026-06-08 14:13 UTCEPSS rescore
  54. 2026-06-07 15:22 UTCEPSS rescore
  55. 2026-06-07 15:22 UTCEPSS rescore
  56. 2026-06-06 13:44 UTCEPSS rescore
  57. 2026-06-06 13:44 UTCEPSS rescore
  58. 2026-06-06 13:44 UTCEPSS rescore
  59. 2026-06-05 22:44 UTCEPSS rescore
  60. 2026-06-05 22:44 UTCEPSS rescore
  61. 2026-06-05 06:07 UTCEPSS rescore
  62. 2026-06-04 13:09 UTCEPSS rescore
  63. 2026-06-04 13:09 UTCEPSS rescore
  64. 2026-06-02 20:10 UTCEPSS rescore
  65. 2026-06-02 20:10 UTCEPSS rescore
  66. 2026-06-01 13:49 UTCEPSS rescore
  67. 2026-06-01 13:49 UTCEPSS rescore
  68. 2026-05-31 22:28 UTCEPSS rescore
  69. 2026-05-31 22:28 UTCEPSS rescore
  70. 2026-05-31 00:13 UTCEPSS rescore
  71. 2026-05-31 00:13 UTCEPSS rescore
  72. 2026-05-30 14:48 UTCEG score recompute
  73. 2026-05-30 14:48 UTCVendor advisory
  74. 2026-05-30 14:48 UTCGHSA enrichment
  75. 2026-05-29 13:40 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(4)

What is CVE-2009-3767?
CVE-2009-3767 is a medium vulnerability published on October 23, 2009. libraries/libldap/tls_o.c in OpenLDAP 2.2 and 2.4, and possibly other versions, when OpenSSL is used, does not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers…
When was CVE-2009-3767 disclosed?
CVE-2009-3767 was first published in the National Vulnerability Database on October 23, 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-2009-3767 actively exploited?
CVE-2009-3767 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 13.3% of all scored CVEs.
How do I remediate CVE-2009-3767?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-3767, 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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