CVE-2025-53741
📋 TL;DR
A heap-based buffer overflow 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 to open a specially crafted document.
💻 Affected Systems
- Microsoft Office 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
Complete system compromise with attacker gaining full control of the victim's computer, enabling data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Local code execution with the privileges of the current user, potentially leading to data exfiltration, credential theft, or installation of persistent malware.
If Mitigated
Limited impact due to application sandboxing, restricted user privileges, or macro security settings blocking malicious content.
🎯 Exploit Status
Exploitation requires user interaction; no public exploit code available at this time
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific version
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53741
Restart Required: Yes
Instructions:
1. Open Microsoft Excel. 2. Go to File > Account > Update Options > Update Now. 3. Restart Excel when prompted. 4. Verify update through File > Account > About Excel.
🔧 Temporary Workarounds
Disable automatic opening of Excel files
windowsConfigure Excel to open files in Protected View by default
Not applicable - configure through Excel Trust Center
Block external Excel files via email
allConfigure email security to block or quarantine Excel attachments
🧯 If You Can't Patch
- Implement application whitelisting to block unauthorized Excel execution
- Use Microsoft Office Viewer or online Excel to open untrusted files
🔍 How to Verify
Check if Vulnerable:
Check Excel version against patched versions in Microsoft advisoryCheck Version:
In Excel: File > Account > About ExcelVerify Fix Applied:
Verify Excel version is updated to patched version and test with known safe files📡 Detection & Monitoring
Log Indicators:
- Excel crash logs with heap corruption errors
- Unexpected Excel process spawning child processes
Network Indicators:
- Excel processes making unexpected outbound connections
SIEM Query:
Process Creation where (Image contains 'excel.exe' AND ParentImage contains 'excel.exe') OR (Image contains 'excel.exe' AND CommandLine contains suspicious patterns)