CVE-2009-3676

HIGHCVSS v2 · 7.17.1—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 7.1 — v2 rates that HIGH (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:C. 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 34.3% 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
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 34%CVSS v2: 7.1Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

The SMB client in the kernel in Microsoft Windows Server 2008 R2 and Windows 7 allows remote SMB servers and man-in-the-middle attackers to cause a denial of service (infinite loop and system hang) via a (1) SMBv1 or (2) SMBv2 response packet that contains (a) an incorrect length value in a NetBIOS header or (b) an additional length field at the end of this response packet, aka "SMB Client Incomplete Response Vulnerability."

CVSS v2.0 (legacy)
7.1HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
7.1(low)
EG Risk
52(Track)
EG Risk 52/100SSVC: 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
Severity71% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
34%
EPSS %ILE
98%
KEV
Not listed

Published

November 13, 2009

Last Modified

April 23, 2026

References (26)

Data Freshness Timeline

(refreshed 2× in last 7d / 7× 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. 2026-08-27 14:19 UTCEPSS rescore
  2. 2026-08-25 13:43 UTCEPSS rescore
  3. 2026-08-19 16:58 UTCEPSS rescore
  4. 2026-08-15 01:24 UTCEPSS rescore
  5. 2026-08-06 13:41 UTCEPSS rescore
  6. 2026-07-30 16:22 UTCEPSS rescore
  7. 2026-07-30 01:26 UTCEPSS rescore
  8. 2026-07-26 13:39 UTCEG score recompute▲ 7.10
  9. 2026-07-25 14:12 UTCEPSS rescore
  10. 2026-07-24 14:12 UTCEPSS rescore
  11. 2026-07-23 14:14 UTCEPSS rescore
  12. 2026-07-23 01:00 UTCEG score recompute
  13. 2026-07-23 00:37 UTCEG score recompute▼ 0.70
  14. 2026-07-23 00:04 UTCEG score recompute▲ 0.70
  15. 2026-07-22 21:43 UTCEG score recompute
  16. 2026-07-22 14:03 UTCEPSS rescore
  17. 2026-07-20 17:03 UTCEPSS rescore
  18. 2026-07-20 17:03 UTCEPSS rescore
  19. 2026-07-18 09:59 UTCEPSS rescore
  20. 2026-07-16 16:58 UTCEPSS rescore
  21. 2026-07-15 16:54 UTCEPSS rescore
  22. 2026-07-15 16:54 UTCEPSS rescore
  23. 2026-07-15 01:55 UTCEPSS rescore
  24. 2026-07-13 06:07 UTCEPSS rescore
  25. 2026-07-11 08:22 UTCEPSS rescore
Show 60 more
  1. 2026-07-11 08:22 UTCEPSS rescore
  2. 2026-07-09 19:04 UTCEPSS rescore
  3. 2026-07-08 15:10 UTCEPSS rescore
  4. 2026-07-06 16:23 UTCEPSS rescore
  5. 2026-07-04 06:27 UTCEPSS rescore
  6. 2026-07-01 15:02 UTCEPSS rescore
  7. 2026-06-28 04:52 UTCEPSS rescore
  8. 2026-06-28 04:52 UTCEPSS rescore
  9. 2026-06-27 03:05 UTCEPSS rescore
  10. 2026-06-25 13:46 UTCEPSS rescore
  11. 2026-06-25 13:46 UTCEPSS rescore
  12. 2026-06-24 14:02 UTCEPSS rescore
  13. 2026-06-24 14:02 UTCEPSS rescore
  14. 2026-06-23 21:29 UTCEPSS rescore
  15. 2026-06-23 21:29 UTCEPSS rescore
  16. 2026-06-21 01:56 UTCEPSS rescore
  17. 2026-06-21 01:56 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. 2026-06-12 23:08 UTCEPSS rescore
  26. 2026-06-12 23:08 UTCEPSS rescore
  27. 2026-06-10 22:14 UTCEPSS rescore
  28. 2026-06-10 13:17 UTCEPSS rescore
  29. 2026-06-08 14:13 UTCEPSS rescore
  30. 2026-06-05 22:44 UTCEPSS rescore
  31. 2026-06-05 22:44 UTCEPSS rescore
  32. 2026-06-05 06:07 UTCEPSS rescore
  33. 2026-06-04 13:09 UTCEPSS rescore
  34. 2026-06-04 13:09 UTCEPSS rescore
  35. 2026-06-02 20:10 UTCEPSS rescore
  36. 2026-06-02 20:10 UTCEPSS rescore
  37. 2026-06-01 13:49 UTCEPSS rescore
  38. 2026-06-01 13:49 UTCEPSS rescore
  39. 2026-05-31 22:28 UTCEPSS rescore
  40. 2026-05-31 22:28 UTCEPSS rescore
  41. 2026-05-31 00:13 UTCEPSS rescore
  42. 2026-05-31 00:13 UTCEPSS rescore
  43. 2026-05-30 14:36 UTCEG score recompute
  44. 2026-05-30 14:36 UTCGHSA enrichment
  45. 2026-05-29 13:40 UTCEPSS rescore
  46. 2026-05-28 13:42 UTCEPSS rescore
  47. 2026-05-28 13:42 UTCEPSS rescore
  48. 2026-05-28 13:42 UTCEPSS rescore
  49. 2026-05-27 13:38 UTCEPSS rescore
  50. 2026-05-27 13:38 UTCEPSS rescore
  51. 2026-05-26 07:16 UTCEPSS rescore
  52. 2026-05-26 07:16 UTCEPSS rescore
  53. 2026-05-24 16:43 UTCEPSS rescore
  54. 2026-05-22 21:15 UTCEPSS rescore
  55. 2026-05-22 21:15 UTCEPSS rescore
  56. 2026-05-20 22:37 UTCEPSS rescore
  57. 2026-05-20 22:37 UTCEPSS rescore
  58. 2026-05-20 11:21 UTCEPSS rescore
  59. 2026-05-20 11:20 UTCEPSS rescore
  60. 2026-05-18 21:29 UTCEPSS rescore

Frequently asked(4)

What is CVE-2009-3676?
CVE-2009-3676 is a high vulnerability published on November 13, 2009. The SMB client in the kernel in Microsoft Windows Server 2008 R2 and Windows 7 allows remote SMB servers and man-in-the-middle attackers to cause a denial of service (infinite loop and system hang) via a (1) SMBv1 or (2) SMBv2 response packet that contains (a) an incorrect length value in a NetBIOS…
When was CVE-2009-3676 disclosed?
CVE-2009-3676 was first published in the National Vulnerability Database on November 13, 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-2009-3676 actively exploited?
CVE-2009-3676 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 34% probability of exploitation in the next 30 days, which ranks it in the top 1.7% of all scored CVEs.
How do I remediate CVE-2009-3676?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-3676, 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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