CVE-2009-0557

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 2022-06-08), 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: 59%CVSS: 7.8Exploit: cisa kev · ssvc active · epss top5pct · epss highExposed: 0

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

Excel in Microsoft Office 2000 SP3, Office XP SP3, Office 2003 SP3, and Office 2004 and 2008 for Mac; Excel in 2007 Microsoft Office System SP1 and SP2; Open XML File Format Converter for Mac; Microsoft Office Excel Viewer 2003 SP3; Microsoft Office Excel Viewer; and Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats SP1 and SP2 allow remote attackers to execute arbitrary code via a crafted Excel file with a malformed record object, aka "Object Record 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
59%
EPSS %ILE
99%
KEV
⚠ Exploited

Published

June 10, 2009

Last Modified

April 22, 2026

Advisory Details (4)

Auto-updated May 19, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic
http://www.securitytracker.com/id?1022351
generic
http://www.securityfocus.com/bid/35241
generic🟡 PoC Available

Microsoft Security Bulletin MS09-021 - Critical | Microsoft Learn

https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-021
generic

VUPEN Security - Vulnerability Research and Intelligence

http://www.vupen.com/english/advisories/2009/1540

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 50× in last 7d / 214× 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 809 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2009-0557?
CVE-2009-0557 is a critical vulnerability published on June 10, 2009. Excel in Microsoft Office 2000 SP3, Office XP SP3, Office 2003 SP3, and Office 2004 and 2008 for Mac; Excel in 2007 Microsoft Office System SP1 and SP2; Open XML File Format Converter for Mac; Microsoft Office Excel Viewer 2003 SP3; Microsoft Office Excel Viewer; and Microsoft Office Compatibility…
When was CVE-2009-0557 disclosed?
CVE-2009-0557 was first published in the National Vulnerability Database on June 10, 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-2009-0557 actively exploited?
Yes. CISA added CVE-2009-0557 to the Known Exploited Vulnerabilities catalog on June 8, 2022, affecting Microsoft Office. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2009-0557?
CVE-2009-0557 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-2009-0557?
CVE-2009-0557 affects Microsoft Office. 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-2009-0557?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-0557, 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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