CVE-2009-0556

CRITICALNVD 8.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-01-07), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.8 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: 67%CVSS: 8.8Exploit: 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.

Microsoft Office PowerPoint 2000 SP3, 2002 SP3, and 2003 SP3, and PowerPoint in Microsoft Office 2004 for Mac, allows remote attackers to execute arbitrary code via a PowerPoint file with an OutlineTextRefAtom containing an an invalid index value that triggers memory corruption, as exploited in the wild in April 2009 by Exploit:Win32/Apptom.gen, aka "Memory Corruption Vulnerability."

CVSS v3
8.8
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
67%
EPSS %ILE
99%
KEV
⚠ Exploited

Published

April 3, 2009

Last Modified

April 22, 2026

Advisory Details (4)

Auto-updated May 2, 2026
No patch confirmed yet. Sources: cert.
generic
http://www.securityfocus.com/bid/34351
generic
http://www.securityfocus.com/archive/1/503453/100/0/threaded
cert

VU#627331 - Microsoft Office PowerPoint code execution vulnerability

http://www.kb.cert.org/vuls/id/627331
generic

About Secunia Research | Flexera

http://secunia.com/advisories/34572

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 53× in last 7d / 220× 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 824 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2009-0556?
CVE-2009-0556 is a critical vulnerability published on April 3, 2009. Microsoft Office PowerPoint 2000 SP3, 2002 SP3, and 2003 SP3, and PowerPoint in Microsoft Office 2004 for Mac, allows remote attackers to execute arbitrary code via a PowerPoint file with an OutlineTextRefAtom containing an an invalid index value that triggers memory corruption, as exploited in the…
When was CVE-2009-0556 disclosed?
CVE-2009-0556 was first published in the National Vulnerability Database on April 3, 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-2009-0556 actively exploited?
Yes. CISA added CVE-2009-0556 to the Known Exploited Vulnerabilities catalog on January 7, 2026, affecting Microsoft Office. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2009-0556?
CVE-2009-0556 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2009-0556?
CVE-2009-0556 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-2009-0556?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-0556, 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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