CVE-2009-0556

HIGH

8.8

CVSS Score

Published: April 3, 2009 at 06:00 PM UTC

Updated: June 16, 2026 at 11:05 PM UTC

2 products affected across 1 vendorPowerPointOffice PowerPoint

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Severity

HIGH8.8

Exploitation

CISA KEV

Exploit prediction

EPSS 67%

SSVC

Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score67.3%

EPSS (Exploit Prediction Scoring System) estimates a 67.3% chance this CVE is exploited in the wild within the next 30 days — higher than 99% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Microsoft Office PowerPoint contains a code injection vulnerability that allows remote attackers to execute arbitrary code via a PowerPoint file with an OutlineTextRefAtom containing an invalid index value that triggers memory corruption.

Required Action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Ransomware Use

Unknown

Added to KEV

Jan 7, 2026

Remediation Due

Jan 28, 2026

273 days overdue

Notes

https://learn.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-017

https://nvd.nist.gov/vuln/detail/CVE-2009-0556

Description

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."