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CVE-2009-0556: Microsoft Office PowerPoint Code Injection Vulnerability

criticalknown exploitedCVE-2009-0556
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as 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.

CSIRTS triage

vendor: Microsoftproduct: Office PowerPointCode injectionMemory corruption
What
The vulnerability allows remote attackers to execute arbitrary code via a specially crafted PowerPoint file.
Who is affected
Users of Microsoft Office PowerPoint are affected.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Install the latest security updates for Microsoft Office PowerPoint.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-01-07
Exploitation
Observed in the wild (CISA KEV)

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

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2009-0556coverage & exploitation statusNVD · CVE.org

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