CVE-2009-3129

CRITICALNVD 7.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-03-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 3 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictMitigate nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 84%CVSS: 7.8Exploit: cisa kev · ssvc active · Metasploit · Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

Microsoft Office Excel 2002 SP3, 2003 SP3, and 2007 SP1 and SP2; Office 2004 and 2008 for Mac; Open XML File Format Converter for Mac; Office Excel Viewer 2003 SP3; Office Excel Viewer SP1 and SP2; and Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 and SP2 allows remote attackers to execute arbitrary code via a spreadsheet with a FEATHEADER record containing an invalid cbHdrData size element that affects a pointer offset, aka "Excel Featheader Record Memory Corruption Vulnerability."

CVSS v3
7.8
EG Score
9.0CRITICALhigh confidence
EG Risk
81
EG Risk 81/100CISA SSVC

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Attend at medium and Act at high mission impact.
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
84%
EPSS %ILE
99th
KEV
⚠ Exploited

CISA SSVCTrack at low, Attend at medium and Act at high mission impact.

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation active (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

November 11, 2009

Last Modified

April 22, 2026

Advisory Details (5)

Auto-updated May 19, 2026
🔬 Proof of concept available. Fix referenced — no release confirmed yet.
generic🟡 PoC Available

Microsoft Security Bulletin MS09-067 - Important | Microsoft Learn

https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-067
generic

ZDI-09-083 | Zero Day Initiative

http://www.zerodayinitiative.com/advisories/ZDI-09-083
generic
http://www.securitytracker.com/id?1023157
generic
http://www.securityfocus.com/bid/36945
generic🟡 PoC Available

Microsoft Excel - FEATHEADER Record (MS09-067) - Windows local Exploit

http://www.exploit-db.com/exploits/14706

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 43× in last 7d / 203× 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 890 total refreshes for this CVE.

  1. 2026-10-10 01:15 UTCGHSA enrichment
  2. 2026-10-09 20:56 UTCEG score recompute
  3. 2026-10-09 20:56 UTCGHSA enrichment
  4. 2026-10-09 20:00 UTCEPSS rescore
  5. 2026-10-09 16:38 UTCGHSA enrichment
  6. 2026-10-09 12:20 UTCGHSA enrichment
  7. 2026-10-09 08:02 UTCGHSA enrichment
  8. 2026-10-09 03:44 UTCGHSA enrichment
  9. 2026-10-08 23:27 UTCGHSA enrichment
  10. 2026-10-08 19:09 UTCGHSA enrichment
  11. 2026-10-08 14:51 UTCGHSA enrichment
  12. 2026-10-08 10:32 UTCGHSA enrichment
  13. 2026-10-08 06:13 UTCGHSA enrichment
  14. 2026-10-08 01:55 UTCGHSA enrichment
  15. 2026-10-07 21:37 UTCGHSA enrichment
  16. 2026-10-07 17:19 UTCGHSA enrichment
  17. 2026-10-07 13:00 UTCGHSA enrichment
  18. 2026-10-07 08:43 UTCGHSA enrichment
  19. 2026-10-07 04:26 UTCGHSA enrichment
  20. 2026-10-07 00:08 UTCGHSA enrichment
  21. 2026-10-06 19:50 UTCGHSA enrichment
  22. 2026-10-06 15:33 UTCEG score recompute
  23. 2026-10-06 15:33 UTCGHSA enrichment
  24. 2026-10-06 15:09 UTCEPSS rescore
  25. 2026-10-06 11:15 UTCGHSA enrichment
Show 75 more
  1. 2026-10-06 06:58 UTCGHSA enrichment
  2. 2026-10-06 02:40 UTCGHSA enrichment
  3. 2026-10-05 22:22 UTCGHSA enrichment
  4. 2026-10-05 18:01 UTCGHSA enrichment
  5. 2026-10-05 13:44 UTCGHSA enrichment
  6. 2026-10-05 09:27 UTCGHSA enrichment
  7. 2026-10-05 05:10 UTCGHSA enrichment
  8. 2026-10-05 00:52 UTCGHSA enrichment
  9. 2026-10-04 20:34 UTCGHSA enrichment
  10. 2026-10-04 16:17 UTCGHSA enrichment
  11. 2026-10-04 11:59 UTCGHSA enrichment
  12. 2026-10-04 07:42 UTCGHSA enrichment
  13. 2026-10-04 03:24 UTCGHSA enrichment
  14. 2026-10-03 23:07 UTCGHSA enrichment
  15. 2026-10-03 18:44 UTCGHSA enrichment
  16. 2026-10-03 14:24 UTCGHSA enrichment
  17. 2026-10-03 10:06 UTCGHSA enrichment
  18. 2026-10-03 05:48 UTCGHSA enrichment
  19. 2026-10-03 01:27 UTCGHSA enrichment
  20. 2026-10-02 21:08 UTCGHSA enrichment
  21. 2026-10-02 16:49 UTCEG score recompute
  22. 2026-10-02 16:49 UTCGHSA enrichment
  23. 2026-10-02 12:32 UTCGHSA enrichment
  24. 2026-10-02 08:14 UTCGHSA enrichment
  25. 2026-10-02 03:56 UTCGHSA enrichment
  26. 2026-10-01 23:38 UTCGHSA enrichment
  27. 2026-10-01 19:20 UTCGHSA enrichment
  28. 2026-10-01 14:59 UTCGHSA enrichment
  29. 2026-10-01 10:42 UTCGHSA enrichment
  30. 2026-10-01 06:25 UTCGHSA enrichment
  31. 2026-10-01 02:08 UTCGHSA enrichment
  32. 2026-09-30 21:51 UTCGHSA enrichment
  33. 2026-09-30 17:34 UTCEG score recompute
  34. 2026-09-30 17:34 UTCGHSA enrichment
  35. 2026-09-30 14:58 UTCEPSS rescore
  36. 2026-09-30 13:16 UTCGHSA enrichment
  37. 2026-09-30 08:59 UTCGHSA enrichment
  38. 2026-09-30 04:42 UTCGHSA enrichment
  39. 2026-09-30 00:23 UTCGHSA enrichment
  40. 2026-09-29 20:06 UTCGHSA enrichment
  41. 2026-09-29 15:48 UTCGHSA enrichment
  42. 2026-09-29 11:28 UTCGHSA enrichment
  43. 2026-09-29 07:11 UTCGHSA enrichment
  44. 2026-09-29 02:50 UTCGHSA enrichment
  45. 2026-09-28 22:32 UTCEG score recompute
  46. 2026-09-28 22:32 UTCGHSA enrichment
  47. 2026-09-28 18:15 UTCGHSA enrichment
  48. 2026-09-28 13:58 UTCEG score recompute
  49. 2026-09-28 13:58 UTCGHSA enrichment
  50. 2026-09-28 09:41 UTCGHSA enrichment
  51. 2026-09-28 05:24 UTCGHSA enrichment
  52. 2026-09-28 01:06 UTCGHSA enrichment
  53. 2026-09-27 21:51 UTCCISA KEV update
  54. 2026-09-27 20:48 UTCGHSA enrichment
  55. 2026-09-27 16:30 UTCGHSA enrichment
  56. 2026-09-27 12:13 UTCGHSA enrichment
  57. 2026-09-27 07:56 UTCGHSA enrichment
  58. 2026-09-27 03:38 UTCGHSA enrichment
  59. 2026-09-26 23:19 UTCGHSA enrichment
  60. 2026-09-26 18:59 UTCEG score recompute
  61. 2026-09-26 18:59 UTCGHSA enrichment
  62. 2026-09-26 15:52 UTCEPSS rescore
  63. 2026-09-26 14:39 UTCGHSA enrichment
  64. 2026-09-26 10:22 UTCGHSA enrichment
  65. 2026-09-26 06:01 UTCGHSA enrichment
  66. 2026-09-26 01:41 UTCEG score recompute
  67. 2026-09-26 01:41 UTCGHSA enrichment
  68. 2026-09-25 21:23 UTCGHSA enrichment
  69. 2026-09-25 19:35 UTCCISA KEV update
  70. 2026-09-25 17:06 UTCGHSA enrichment
  71. 2026-09-25 14:55 UTCCISA KEV update
  72. 2026-09-25 12:48 UTCGHSA enrichment
  73. 2026-09-25 08:31 UTCGHSA enrichment
  74. 2026-09-25 04:14 UTCGHSA enrichment
  75. 2026-09-24 23:57 UTCGHSA enrichment

Publicly available exploits

(3 references)

Working exploit code is in the public domain (1 Metasploit module) (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-16625✓ verified
    First seen Sep 25, 2010

    Microsoft Excel - Malformed FEATHEADER Record (MS09-067) (Metasploit)

    Open source ↗
  • Metasploitexploit/windows/fileformat/ms09_067_excel_featheader✓ verified
    First seen Nov 10, 2009

    MS09-067 Microsoft Excel Malformed FEATHEADER Record Vulnerability

    Open source ↗
  • Exploit-DBEDB-14706
    First seen Aug 21, 2010

    Microsoft Excel - FEATHEADER Record (MS09-067)

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2009-3129?
CVE-2009-3129 is a critical vulnerability published on November 11, 2009. Microsoft Office Excel 2002 SP3, 2003 SP3, and 2007 SP1 and SP2; Office 2004 and 2008 for Mac; Open XML File Format Converter for Mac; Office Excel Viewer 2003 SP3; Office Excel Viewer SP1 and SP2; and Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 and SP2 allows…
When was CVE-2009-3129 disclosed?
CVE-2009-3129 was first published on November 11, 2009, with the most recent update on April 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2009-3129 actively exploited?
Yes. CISA added CVE-2009-3129 to the Known Exploited Vulnerabilities catalog on March 3, 2022, affecting Microsoft Excel. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate attention. A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
What is the CVSS score of CVE-2009-3129?
CVE-2009-3129 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0 (CRITICAL).
Which products are affected by CVE-2009-3129?
CVE-2009-3129 affects Microsoft Excel.
How do I remediate CVE-2009-3129?
A fix for CVE-2009-3129 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

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