CVE-2025-62201
📋 TL;DR
A heap-based buffer overflow vulnerability in Microsoft Office Excel allows attackers to execute arbitrary code on a victim's system by tricking them into opening a malicious Excel file. This affects all users running vulnerable versions of Microsoft Excel. Successful exploitation requires user interaction to open a specially crafted file.
💻 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
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, least privilege user accounts, or macro security settings blocking malicious content.
🎯 Exploit Status
Exploitation requires user interaction to open malicious file. No public exploit code available at CVE publication.
🛠️ 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-2025-62201
Restart Required: Yes
Instructions:
1. Open any Office application
2. Go to File > Account > Update Options > Update Now
3. Restart computer after update completes
4. For enterprise deployments, use Microsoft Update Catalog or WSUS
🔧 Temporary Workarounds
Block Excel file types via Group Policy
windowsPrevent opening of Excel files from untrusted sources
Use Group Policy Editor to configure file block settings in Office Trust Center
Enable Protected View for all files
windowsForce all Excel files to open in Protected View sandbox
Excel Options > Trust Center > Trust Center Settings > Protected View > Enable all Protected View options
🧯 If You Can't Patch
- Implement application whitelisting to block unauthorized Excel execution
- Deploy email filtering to block malicious Excel attachments
🔍 How to Verify
Check if Vulnerable:
Check Excel version against patched versions in Microsoft Security Update GuideCheck Version:
In Excel: File > Account > About Excel (Windows) or Excel > About Excel (macOS)Verify Fix Applied:
Verify Excel version matches or exceeds patched version listed in Microsoft advisory📡 Detection & Monitoring
Log Indicators:
- Excel crash logs with heap corruption errors
- Windows Event Logs showing Excel process spawning unexpected child processes
Network Indicators:
- Outbound connections from Excel process to suspicious IPs
- DNS queries for command and control domains from Excel
SIEM Query:
source="windows" AND process="EXCEL.EXE" AND (event_id=1000 OR event_id=1001) AND message="heap"