Microsoft Office Remote Code Execution
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.
Quick answer
Microsoft Office should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- 2000
- 2002
- 2003
- 2007
- 2004
- 2008
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
Treat CVE-2009-0238 as a legacy Microsoft Office Excel remote code execution risk. Microsoft MS09-009 says exploitation requires a user to open a specially crafted Excel file, but successful exploitation can give the attacker the user rights of the victim. Apply the MS09-009 update for affected Excel, Excel Viewer, Office for Mac, and Office Compatibility Pack deployments, or replace unsupported Office versions with supported releases. Until all endpoints are remediated, block untrusted Excel attachments and use Office file-opening hardening controls.
- Inventory Microsoft Office Excel, Excel Viewer, Office Compatibility Pack, and legacy Office for Mac installations across endpoints.
- Apply the relevant MS09-009 security update for each affected Office or Excel component, including Compatibility Pack updates where required.
- Replace unsupported Excel and Office versions that can no longer receive Microsoft security updates.
- Block or quarantine unexpected Excel attachments and externally supplied spreadsheets until patch coverage is verified.
- Use Microsoft Office Isolated Conversion Environment or equivalent document-handling controls where legacy workflows require opening untrusted Excel files.
- Reduce user privileges on systems that process external spreadsheets and remove local admin rights where possible.
- Review EDR, mail-security, and endpoint logs for suspicious Excel launches, child processes, dropped files, or macro-like execution chains.
- Educate users who handle external spreadsheets to avoid opening unexpected Excel files from email or shared locations.
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Verify the fix
- Confirm MS09-009 updates are installed for all affected Excel, Excel Viewer, and Compatibility Pack components.
- Confirm endpoint inventory no longer shows unsupported or vulnerable Office Excel versions.
- Confirm vulnerability management no longer flags CVE-2009-0238 on active systems.
- Test a representative business spreadsheet workflow after patching to confirm compatibility.
- Review post-patch EDR and mail-security logs for continued malicious Excel activity.
Related categories
Trusted references
FAQ
What is affected by CVE-2009-0238?
Microsoft Office should be checked against the vendor advisory and trusted references linked on this page.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
Why can this risk appear in multiple categories?
A vulnerability can belong to more than one platform or ecosystem. Fixnx keeps one canonical risk page while also listing it in every relevant category.