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CVE-2009-0238: Microsoft Office Remote Code Execution

criticalknown exploitedCVE-2009-0238
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 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

vendor: Microsoftproduct: Office ExcelRemote code execution
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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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-04-14
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2009-0238

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-2009-0238coverage & exploitation statusNVD · CVE.org

Recent advisories for Microsoft Office Remote

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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