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 — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 86%CVSS: 7.8Exploit: cisa kev · ssvc active · Metasploit · Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed: 0

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

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
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
86%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

November 11, 2009

Last Modified

April 22, 2026

Advisory Details (5)

Auto-updated May 19, 2026
🔬 Proof of concept available. No patch 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 48× in last 7d / 206× 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 753 total refreshes for this CVE.

  1. 2026-09-19 15:09 UTCGHSA enrichment
  2. 2026-09-19 10:52 UTCGHSA enrichment
  3. 2026-09-19 06:35 UTCGHSA enrichment
  4. 2026-09-19 02:17 UTCGHSA enrichment
  5. 2026-09-18 22:00 UTCEG score recompute
  6. 2026-09-18 22:00 UTCGHSA enrichment
  7. 2026-09-18 19:20 UTCCISA KEV update
  8. 2026-09-18 17:43 UTCGHSA enrichment
  9. 2026-09-18 14:15 UTCCISA KEV update
  10. 2026-09-18 13:25 UTCGHSA enrichment
  11. 2026-09-18 09:07 UTCGHSA enrichment
  12. 2026-09-18 04:50 UTCGHSA enrichment
  13. 2026-09-18 00:33 UTCGHSA enrichment
  14. 2026-09-17 20:16 UTCEG score recompute
  15. 2026-09-17 20:16 UTCGHSA enrichment
  16. 2026-09-17 19:20 UTCEPSS rescore
  17. 2026-09-17 15:59 UTCGHSA enrichment
  18. 2026-09-17 11:41 UTCGHSA enrichment
  19. 2026-09-17 07:23 UTCGHSA enrichment
  20. 2026-09-17 03:05 UTCGHSA enrichment
  21. 2026-09-16 22:47 UTCGHSA enrichment
  22. 2026-09-16 18:30 UTCGHSA enrichment
  23. 2026-09-16 14:13 UTCEG score recompute
  24. 2026-09-16 14:13 UTCGHSA enrichment
  25. 2026-09-16 14:10 UTCCISA KEV update
Show 75 more
  1. 2026-09-16 09:56 UTCGHSA enrichment
  2. 2026-09-16 05:38 UTCGHSA enrichment
  3. 2026-09-16 01:21 UTCGHSA enrichment
  4. 2026-09-15 21:03 UTCGHSA enrichment
  5. 2026-09-15 16:45 UTCGHSA enrichment
  6. 2026-09-15 12:28 UTCGHSA enrichment
  7. 2026-09-15 08:10 UTCGHSA enrichment
  8. 2026-09-15 03:52 UTCGHSA enrichment
  9. 2026-09-14 23:35 UTCGHSA enrichment
  10. 2026-09-14 19:24 UTCCISA KEV update
  11. 2026-09-14 19:17 UTCGHSA enrichment
  12. 2026-09-14 14:59 UTCGHSA enrichment
  13. 2026-09-14 10:42 UTCGHSA enrichment
  14. 2026-09-14 06:24 UTCGHSA enrichment
  15. 2026-09-14 02:07 UTCGHSA enrichment
  16. 2026-09-13 21:50 UTCGHSA enrichment
  17. 2026-09-13 17:33 UTCGHSA enrichment
  18. 2026-09-13 13:16 UTCGHSA enrichment
  19. 2026-09-13 08:59 UTCGHSA enrichment
  20. 2026-09-13 04:41 UTCGHSA enrichment
  21. 2026-09-13 00:24 UTCGHSA enrichment
  22. 2026-09-12 20:07 UTCGHSA enrichment
  23. 2026-09-12 15:49 UTCGHSA enrichment
  24. 2026-09-12 11:32 UTCGHSA enrichment
  25. 2026-09-12 07:15 UTCGHSA enrichment
  26. 2026-09-12 02:58 UTCGHSA enrichment
  27. 2026-09-11 22:40 UTCGHSA enrichment
  28. 2026-09-11 18:49 UTCCISA KEV update
  29. 2026-09-11 18:19 UTCGHSA enrichment
  30. 2026-09-11 14:01 UTCGHSA enrichment
  31. 2026-09-11 09:43 UTCGHSA enrichment
  32. 2026-09-11 05:26 UTCGHSA enrichment
  33. 2026-09-11 01:08 UTCGHSA enrichment
  34. 2026-09-10 20:50 UTCGHSA enrichment
  35. 2026-09-10 19:28 UTCCISA KEV update
  36. 2026-09-10 16:33 UTCGHSA enrichment
  37. 2026-09-10 12:15 UTCEG score recompute
  38. 2026-09-10 12:15 UTCGHSA enrichment
  39. 2026-09-10 09:24 UTCEPSS rescore
  40. 2026-09-10 07:58 UTCGHSA enrichment
  41. 2026-09-10 03:41 UTCGHSA enrichment
  42. 2026-09-09 23:24 UTCGHSA enrichment
  43. 2026-09-09 19:08 UTCCISA KEV update
  44. 2026-09-09 19:06 UTCGHSA enrichment
  45. 2026-09-09 14:46 UTCGHSA enrichment
  46. 2026-09-09 10:29 UTCGHSA enrichment
  47. 2026-09-09 06:12 UTCGHSA enrichment
  48. 2026-09-09 01:53 UTCGHSA enrichment
  49. 2026-09-08 21:36 UTCGHSA enrichment
  50. 2026-09-08 18:54 UTCCISA KEV update
  51. 2026-09-08 17:18 UTCGHSA enrichment
  52. 2026-09-08 12:58 UTCGHSA enrichment
  53. 2026-09-08 08:38 UTCGHSA enrichment
  54. 2026-09-08 04:18 UTCGHSA enrichment
  55. 2026-09-08 00:00 UTCGHSA enrichment
  56. 2026-09-07 19:43 UTCGHSA enrichment
  57. 2026-09-07 15:26 UTCGHSA enrichment
  58. 2026-09-07 11:08 UTCGHSA enrichment
  59. 2026-09-07 06:49 UTCGHSA enrichment
  60. 2026-09-07 02:26 UTCGHSA enrichment
  61. 2026-09-06 22:09 UTCGHSA enrichment
  62. 2026-09-06 17:49 UTCEG score recompute
  63. 2026-09-06 17:49 UTCGHSA enrichment
  64. 2026-09-06 13:41 UTCEPSS rescore
  65. 2026-09-06 13:31 UTCGHSA enrichment
  66. 2026-09-06 09:13 UTCGHSA enrichment
  67. 2026-09-06 04:51 UTCGHSA enrichment
  68. 2026-09-06 00:34 UTCGHSA enrichment
  69. 2026-09-05 20:16 UTCGHSA enrichment
  70. 2026-09-05 15:59 UTCEG score recompute
  71. 2026-09-05 15:59 UTCGHSA enrichment
  72. 2026-09-05 15:22 UTCEPSS rescore
  73. 2026-09-05 11:36 UTCGHSA enrichment
  74. 2026-09-05 07:17 UTCGHSA enrichment
  75. 2026-09-05 02:59 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 ↗
  • Exploit-DBEDB-14706
    First seen Aug 21, 2010

    Microsoft Excel - FEATHEADER Record (MS09-067)

    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 ↗

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 in the National Vulnerability Database 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 patching attention.
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.
Which products are affected by CVE-2009-3129?
CVE-2009-3129 affects Microsoft Excel. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2009-3129?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-3129, 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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