CVE-2009-0557

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 2022-06-08), 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
7.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 59%CVSS: 7.8Exploit: NoneExposed: 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)
EPSS
99.0%
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 84× in last 7d / 378× 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 506 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2009-0557?
CVE-2009-0557 is a high 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2009-0557

Explore →

Is Your Infrastructure Affected by CVE-2009-0557?

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

Start Free Scan →Browse All CVEs