CVE-2009-0556

HighActively exploited (CISA KEV)

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."

SeverityHigh

CVSS8.8

Exploit probability—

Product

Microsoft Office

PublishedApr 3, 2009

First seenApr 3, 2009

Added to KEVJan 7, 2026

Weakness typeCWE-94Code injection

How to fix

CISA 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.

CISA due date: Jan 28, 2026

Vendor advisories

docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-017

Affected products

Product	Affected versions	Fixed in
microsoft office_powerpoint	2004	—
microsoft powerpoint	2000, 2002, 2003	—

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