CVE-2009-0556
Actively exploited. CVE-2009-0556 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-01-07) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching 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
- 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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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2009-0556: Microsoft Office PowerPoint Code Injection Vulnerabilitycisa-kev · 2026-01-07
External references
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