CVE-2025-24082
📋 TL;DR
A use-after-free vulnerability in Microsoft Office Excel allows attackers to execute arbitrary code on affected systems by tricking users into opening malicious Excel files. This affects all users running vulnerable versions of Microsoft Excel. Successful exploitation requires user interaction.
💻 Affected Systems
- Microsoft Excel
📦 What is this software?
365 Apps by Microsoft
365 Apps by Microsoft
Excel by Microsoft
Excel by Microsoft
Office by Microsoft
Office by Microsoft
Office Long Term Servicing Channel by Microsoft
View all CVEs affecting Office Long Term Servicing Channel →
Office Long Term Servicing Channel by Microsoft
View all CVEs affecting Office Long Term Servicing Channel →
Office Long Term Servicing Channel by Microsoft
View all CVEs affecting Office Long Term Servicing Channel →
Office Long Term Servicing Channel by Microsoft
View all CVEs affecting Office Long Term Servicing Channel →
Office Long Term Servicing Channel by Microsoft
View all CVEs affecting Office Long Term Servicing Channel →
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining same privileges as the logged-in user, potentially leading to data theft, ransomware deployment, or lateral movement.
Likely Case
Local code execution with user privileges, enabling malware installation, credential harvesting, or persistence mechanisms.
If Mitigated
Limited impact due to application sandboxing, antivirus detection, or user account restrictions.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file). No public exploit code available at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific patch versions
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-24082
Restart Required: No
Instructions:
1. Open Excel. 2. Go to File > Account > Update Options > Update Now. 3. Alternatively, use Windows Update for Microsoft 365 installations. 4. Verify update installation.
🔧 Temporary Workarounds
Disable Excel macro execution
allPrevents execution of malicious macros that could exploit this vulnerability
Not applicable - configure via Excel Trust Center settings
Open Excel in Protected View
allOpens files from untrusted sources in read-only mode with limited functionality
Not applicable - configure via Excel Trust Center settings
🧯 If You Can't Patch
- Restrict Excel file execution via application control policies
- Implement email filtering to block suspicious Excel attachments
🔍 How to Verify
Check if Vulnerable:
Check Excel version against patched versions in Microsoft advisoryCheck Version:
In Excel: File > Account > About Excel (version displayed)Verify Fix Applied:
Verify Excel version is updated to patched version listed in Microsoft advisory📡 Detection & Monitoring
Log Indicators:
- Excel crash logs with memory access violations
- Unexpected Excel process spawning child processes
Network Indicators:
- Excel processes making unexpected network connections post-file open
SIEM Query:
Process creation where parent_process contains 'excel.exe' AND command_line contains suspicious patterns