CVE Watch—

CVE-2009-0556

Microsoft Office PowerPoint Code Injection Vulnerability

CVSS

—

No CVSS

EPSS

67.3%

p99

KEV

YES

Jan 7, 2026

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

67.3%EPSS · 30 days67.5%

2026-09-172026-10-14

KEV catalog record

Product

Microsoft / Office

Vulnerability

Microsoft Office PowerPoint Code Injection Vulnerability

Added to KEV

Jan 7, 2026

Remediate by

Jan 28, 2026

Known ransomware use

Summary description

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.

Notes

https://learn.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-017 ; https://nvd.nist.gov/vuln/detail/CVE-2009-0556

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