CVE-2009-3129

HIGHNVD 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
7.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 86%CVSS: 7.8Exploit: NoneExposed: 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)
EPSS
99.7%
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 50× in last 7d / 199× 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 373 total refreshes for this CVE.

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