CVE-2009-0238
Actively exploited. CVE-2009-0238 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-04-14) — 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 Excel contains a remote code execution vulnerability that could allow an attacker to take complete control of an affected system if a user opens a specially crafted Excel file that includes a malformed object.
CSIRTS triage
- What
- Microsoft Office Excel contains a remote code execution vulnerability that could allow an attacker to take complete control of an affected system.
- Who is affected
- Users of Microsoft Office Excel who open specially crafted Excel files.
- Urgency
- Immediate action is required as the vulnerability is actively exploited and rated critical.
- Action
- Update Microsoft Office to the latest version to mitigate this vulnerability.
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-2009-0238: Microsoft Office Remote Code Executioncisa-kev · 2026-04-14
External references
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