What it is
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.
What to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vendor notices and references
- learn.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-009
- nvd.nist.gov/vuln/detail/CVE-2009-0238
Description and required action as published by CISA. Full record at NVD.
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