CVE-2006-4343

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: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 17.4% 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
Weaponized
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 19%CVSS v2: 4.3Exploit: Exploit-DB (verified) · epss top5pct · public exploitExposed: 0

A fix is available — apply it.

The get_server_hello function in the SSLv2 client code in OpenSSL 0.9.7 before 0.9.7l, 0.9.8 before 0.9.8d, and earlier versions allows remote servers to cause a denial of service (client crash) via unknown vectors that trigger a null pointer dereference.

CVSS v2.0 (legacy)
4.3MEDIUMNVD never assigned a CVSS v3 rating to this CVE
EG Score
4.3(low)
EG Risk
50(Track)
EG Risk 50/100SSVC: 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%
Exploitation65% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
19%
EPSS %ILE
97%
KEV
Not listed

Published

September 28, 2006

Last Modified

April 23, 2026

References (262)

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibssl0.9.7 (0.9.7e-3ubuntu0.4) @ hoary2026-05-31ubuntu
redhatrhn_solaris_bootstrap_5_1_1_3-0:1-02008-08-13redhat
redhatrhn_solaris_bootstrap_5_0_2_3-0:1-02008-06-30redhat
redhatopenssl096b-0:0.9.6b-22.462006-09-28redhat

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-3sarge1, 0.9.7e-3sarge2, 0.9.7e-3sarge30.9.7e-3sarge4—
openssl0960.9.6m-1, 0.9.6m-1sarge1, 0.9.6m-1sarge20.9.6m-1sarge4—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
openssl—0.9.8c-2—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
openssl—0.9.8c-2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
openssl—0.9.8c-2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
openssl—0.9.8c-2—

Weakness Classification(1)

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

All Vendor Advisories

(5)

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

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-4773✓ verified
    First seen Dec 23, 2007

    OpenSSL < 0.9.7l/0.9.8d - SSLv2 Client Crash

    Open source ↗
  • Exploit-DBEDB-28726✓ verified
    First seen Sep 28, 2006

    OpenSSL SSLv2 - Null Pointer Dereference Client Denial of Service

    Open source ↗

Frequently asked(4)

What is CVE-2006-4343?
CVE-2006-4343 is a medium vulnerability published on September 28, 2006. The getserverhello function in the SSLv2 client code in OpenSSL 0.9.7 before 0.9.7l, 0.9.8 before 0.9.8d, and earlier versions allows remote servers to cause a denial of service (client crash) via unknown vectors that trigger a null pointer dereference.
When was CVE-2006-4343 disclosed?
CVE-2006-4343 was first published in the National Vulnerability Database on September 28, 2006, 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-2006-4343 actively exploited?
CVE-2006-4343 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 19% probability of exploitation in the next 30 days, which ranks it in the top 2.9% of all scored CVEs.
How do I remediate CVE-2006-4343?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2006-4343, 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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2006-4343

Explore →

Is Your Infrastructure Affected by CVE-2006-4343?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs