CVE-2009-2526

NONECVSS 0.0Elevated
0.0
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 82%
CISA-KEV: Not listedEPSS: 82%CVSS: —Exploit: NoneExposed: 0

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

Microsoft Windows Vista Gold, SP1, and SP2 and Server 2008 Gold and SP2 do not properly validate fields in SMBv2 packets, which allows remote attackers to cause a denial of service (infinite loop and system hang) via a crafted packet to the Server service, aka "SMBv2 Infinite Loop Vulnerability."

CVSS v3
—
EG Score
0.0(none)
EPSS
99.6%
KEV
Not listed

Published

October 14, 2009

Last Modified

April 23, 2026

References (6)

Data Freshness Timeline

(refreshed 0× in last 7d / 19× 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. 2026-06-30 23:19 UTCEPSS rescore
  2. 2026-06-28 04:52 UTCEPSS rescore
  3. 2026-06-28 04:52 UTCEPSS rescore
  4. 2026-06-27 03:05 UTCEPSS rescore
  5. 2026-06-25 13:46 UTCEPSS rescore
  6. 2026-06-25 13:46 UTCEPSS rescore
  7. 2026-06-24 14:02 UTCEPSS rescore
  8. 2026-06-24 14:02 UTCEPSS rescore
  9. 2026-06-23 21:29 UTCEPSS rescore
  10. 2026-06-23 21:29 UTCEPSS rescore
  11. 2026-06-21 01:56 UTCEPSS rescore
  12. 2026-06-21 01:56 UTCEPSS rescore
  13. 2026-06-17 17:49 UTCEPSS rescore
  14. 2026-06-17 17:49 UTCEPSS rescore
  15. 2026-06-15 17:44 UTCEPSS rescore
  16. 2026-06-12 23:08 UTCEPSS rescore
  17. 2026-06-12 23:08 UTCEPSS rescore
  18. 2026-06-10 22:14 UTCEPSS rescore
  19. 2026-06-10 13:17 UTCEPSS rescore
  20. 2026-06-06 13:44 UTCEPSS rescore
  21. 2026-06-06 13:44 UTCEPSS rescore
  22. 2026-06-06 13:44 UTCEPSS rescore
  23. 2026-06-05 22:44 UTCEPSS rescore
  24. 2026-06-05 22:44 UTCEPSS rescore
  25. 2026-06-05 06:07 UTCEPSS rescore
Show 18 more
  1. 2026-06-04 13:09 UTCEPSS rescore
  2. 2026-06-04 13:09 UTCEPSS rescore
  3. 2026-06-01 13:49 UTCEPSS rescore
  4. 2026-06-01 13:49 UTCEPSS rescore
  5. 2026-05-30 14:55 UTCEG score recompute
  6. 2026-05-30 14:55 UTCGHSA enrichment
  7. 2026-05-29 13:40 UTCEPSS rescore
  8. 2026-05-28 13:42 UTCEPSS rescore
  9. 2026-05-28 13:42 UTCEPSS rescore
  10. 2026-05-28 13:42 UTCEPSS rescore
  11. 2026-05-27 13:38 UTCEPSS rescore
  12. 2026-05-27 13:38 UTCEPSS rescore
  13. 2026-05-24 16:43 UTCEPSS rescore
  14. 2026-05-22 21:15 UTCEPSS rescore
  15. 2026-05-22 21:15 UTCEPSS rescore
  16. 2026-05-20 22:37 UTCEPSS rescore
  17. 2026-05-20 22:37 UTCEPSS rescore
  18. 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-40280
    First seen Feb 26, 2016

    Microsoft Windows - 'srv2.sys' SMB Code Execution (Python) (MS09-050)

    Open source ↗
  • Exploit-DBEDB-14674
    First seen Aug 17, 2010

    Microsoft Windows - 'srv2.sys' SMB Negotiate ProcessID Function Table Dereference (MS09-050)

    Open source ↗

Frequently asked(4)

What is CVE-2009-2526?
CVE-2009-2526 is a none vulnerability published on October 14, 2009. Microsoft Windows Vista Gold, SP1, and SP2 and Server 2008 Gold and SP2 do not properly validate fields in SMBv2 packets, which allows remote attackers to cause a denial of service (infinite loop and system hang) via a crafted packet to the Server service, aka "SMBv2 Infinite Loop Vulnerability."
When was CVE-2009-2526 disclosed?
CVE-2009-2526 was first published in the National Vulnerability Database on October 14, 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-2009-2526 actively exploited?
CVE-2009-2526 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2009-2526?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-2526, 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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