CVE-2006-4339

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:P/I:N/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 4.9% 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
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 5%CVSS v2: 4.3Exploit: None knownExposed: 0

A fix is available — apply it.

OpenSSL before 0.9.7, 0.9.7 before 0.9.7k, and 0.9.8 before 0.9.8c, when using an RSA key with exponent 3, removes PKCS-1 padding before generating a hash, which allows remote attackers to forge a PKCS #1 v1.5 signature that is signed by that RSA key and prevents OpenSSL from correctly verifying X.509 and other certificates that use PKCS #1.

CVSS v2.0 (legacy)
4.3MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
4.3(low)
EG Risk
26(Track)
EG Risk 26/100SSVC: 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%
Exploitation5% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
5%
EPSS %ILE
92%
KEV
Not listed

Published

September 5, 2006

Last Modified

April 16, 2026

References (400)

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibssl0.9.7 (0.9.7e-3ubuntu0.3) @ hoary2026-05-31ubuntu

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 5 ecosystems)
Debian:3.1(2)
PackageVulnerable rangeFixed inDependents
openssl0.9.7e-3, 0.9.7e-3sarge10.9.7e-3sarge2—
openssl0960.9.6m-1, 0.9.6m-1sarge10.9.6m-1sarge2—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
openssl—0.9.8b-3—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
openssl—0.9.8b-3—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
openssl—0.9.8b-3—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
openssl—0.9.8b-3—

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 3× 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. 2026-09-10 09:23 UTCEPSS rescore
  2. 2026-09-05 15:21 UTCEPSS rescore
  3. 2026-09-04 04:59 UTCEPSS rescore
  4. 2026-08-30 01:14 UTCEPSS rescore
  5. 2026-08-27 11:04 UTCOSV refresh
  6. 2026-08-11 00:31 UTCOSV refresh
  7. 2026-08-08 16:30 UTCEPSS rescore
  8. 2026-08-05 19:11 UTCEPSS rescore
  9. 2026-08-04 15:03 UTCEPSS rescore
  10. 2026-08-03 10:27 UTCEPSS rescore
  11. 2026-07-26 13:29 UTCEG score recompute▲ 4.30
  12. 2026-07-26 00:44 UTCOSV refresh
  13. 2026-07-24 14:11 UTCEPSS rescore
  14. 2026-07-23 00:51 UTCEG score recompute
  15. 2026-07-23 00:30 UTCEG score recompute
  16. 2026-07-22 23:55 UTCEG score recompute
  17. 2026-07-22 21:35 UTCEG score recompute
  18. 2026-07-20 17:02 UTCEPSS rescore
  19. 2026-07-18 09:59 UTCEPSS rescore
  20. 2026-07-16 16:58 UTCEPSS rescore
  21. 2026-07-15 16:53 UTCEPSS rescore
  22. 2026-07-15 01:55 UTCEPSS rescore
  23. 2026-07-13 22:25 UTCEPSS rescore
  24. 2026-07-13 06:07 UTCEPSS rescore
  25. 2026-07-13 06:07 UTCEPSS rescore
Show 73 more
  1. 2026-07-11 08:22 UTCEPSS rescore
  2. 2026-07-09 19:03 UTCEPSS rescore
  3. 2026-07-08 19:39 UTCOSV refresh
  4. 2026-07-08 15:09 UTCEPSS rescore
  5. 2026-07-06 02:19 UTCEPSS rescore
  6. 2026-07-06 02:19 UTCEPSS rescore
  7. 2026-07-04 06:26 UTCEPSS rescore
  8. 2026-07-02 14:00 UTCEPSS rescore
  9. 2026-07-01 15:01 UTCEPSS rescore
  10. 2026-06-29 14:02 UTCEPSS rescore
  11. 2026-06-29 14:02 UTCEPSS rescore
  12. 2026-06-27 03:04 UTCEPSS rescore
  13. 2026-06-25 13:46 UTCEPSS rescore
  14. 2026-06-24 14:01 UTCEPSS rescore
  15. 2026-06-24 14:01 UTCEPSS rescore
  16. 2026-06-23 21:29 UTCEPSS rescore
  17. 2026-06-23 21:29 UTCEPSS rescore
  18. 2026-06-21 01:56 UTCEPSS rescore
  19. 2026-06-20 07:42 UTCOSV refresh
  20. 2026-06-19 19:22 UTCEPSS rescore
  21. 2026-06-19 19:22 UTCEPSS rescore
  22. 2026-06-18 17:49 UTCEPSS rescore
  23. 2026-06-18 17:49 UTCEPSS rescore
  24. 2026-06-17 17:49 UTCEPSS rescore
  25. 2026-06-17 17:49 UTCEPSS rescore
  26. 2026-06-16 17:49 UTCEPSS rescore
  27. 2026-06-16 17:49 UTCEPSS rescore
  28. 2026-06-15 17:44 UTCEPSS rescore
  29. 2026-06-14 23:13 UTCEPSS rescore
  30. 2026-06-13 22:56 UTCEPSS rescore
  31. 2026-06-12 23:08 UTCEPSS rescore
  32. 2026-06-11 13:55 UTCEPSS rescore
  33. 2026-06-10 22:14 UTCEPSS rescore
  34. 2026-06-10 13:17 UTCEPSS rescore
  35. 2026-06-07 15:21 UTCEPSS rescore
  36. 2026-06-06 13:44 UTCEPSS rescore
  37. 2026-06-06 13:44 UTCEPSS rescore
  38. 2026-06-05 22:43 UTCEPSS rescore
  39. 2026-06-05 06:07 UTCEPSS rescore
  40. 2026-06-05 06:07 UTCEPSS rescore
  41. 2026-06-04 13:09 UTCEPSS rescore
  42. 2026-06-04 13:09 UTCEPSS rescore
  43. 2026-06-02 20:10 UTCEPSS rescore
  44. 2026-06-02 20:10 UTCEPSS rescore
  45. 2026-06-01 13:49 UTCEPSS rescore
  46. 2026-06-01 13:49 UTCEPSS rescore
  47. 2026-06-01 13:49 UTCEPSS rescore
  48. 2026-05-31 22:28 UTCEPSS rescore
  49. 2026-05-31 06:58 UTCEG score recompute
  50. 2026-05-31 06:58 UTCVendor advisory
  51. 2026-05-31 06:58 UTCGHSA enrichment
  52. 2026-05-31 00:13 UTCEPSS rescore
  53. 2026-05-31 00:13 UTCEPSS rescore
  54. 2026-05-31 00:13 UTCEPSS rescore
  55. 2026-05-29 13:40 UTCEPSS rescore
  56. 2026-05-28 13:42 UTCEPSS rescore
  57. 2026-05-28 13:42 UTCEPSS rescore
  58. 2026-05-27 13:37 UTCEPSS rescore
  59. 2026-05-27 13:37 UTCEPSS rescore
  60. 2026-05-26 16:01 UTCOSV refresh
  61. 2026-05-26 13:41 UTCEPSS rescore
  62. 2026-05-26 13:41 UTCEPSS rescore
  63. 2026-05-26 07:16 UTCEPSS rescore
  64. 2026-05-26 07:16 UTCEPSS rescore
  65. 2026-05-24 16:42 UTCEPSS rescore
  66. 2026-05-22 21:15 UTCEPSS rescore
  67. 2026-05-22 21:15 UTCEPSS rescore
  68. 2026-05-21 22:38 UTCEPSS rescore
  69. 2026-05-20 22:36 UTCEPSS rescore
  70. 2026-05-20 22:36 UTCEPSS rescore
  71. 2026-05-20 11:20 UTCEPSS rescore
  72. 2026-05-20 11:20 UTCEPSS rescore
  73. 2026-05-18 21:29 UTCEPSS rescore

Frequently asked(4)

What is CVE-2006-4339?
CVE-2006-4339 is a medium vulnerability published on September 5, 2006. OpenSSL before 0.9.7, 0.9.7 before 0.9.7k, and 0.9.8 before 0.9.8c, when using an RSA key with exponent 3, removes PKCS-1 padding before generating a hash, which allows remote attackers to forge a PKCS #1 v1.5 signature that is signed by that RSA key and prevents OpenSSL from correctly verifying…
When was CVE-2006-4339 disclosed?
CVE-2006-4339 was first published in the National Vulnerability Database on September 5, 2006, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2006-4339 actively exploited?
CVE-2006-4339 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5% probability of exploitation in the next 30 days, which ranks it in the top 8.3% of all scored CVEs.
How do I remediate CVE-2006-4339?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2006-4339, 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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