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 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 47× in last 7d / 196× 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 584 total refreshes for this CVE.

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

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2009-3129

Explore →

Is Your Infrastructure Affected by CVE-2009-3129?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs