CVE-2025-24077
📋 TL;DR
A use-after-free vulnerability in Microsoft Office Word allows attackers to execute arbitrary code on affected systems by tricking users into opening malicious documents. This affects all users running vulnerable versions of Microsoft Word. Successful exploitation requires user interaction.
💻 Affected Systems
- Microsoft Office Word
📦 What is this software?
365 Apps by Microsoft
365 Apps 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 →
⚠️ 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 networks.
Likely Case
Local privilege escalation leading to data exfiltration, malware installation, or persistence mechanisms being established on the compromised system.
If Mitigated
Limited impact with potential application crashes or denial of service if exploit attempts are blocked by security controls.
🎯 Exploit Status
Exploitation requires social engineering to deliver malicious documents; no public exploit code known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: To be determined from Microsoft's security update
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-24077
Restart Required: No
Instructions:
1. Open Microsoft Word. 2. Go to File > Account > Update Options > Update Now. 3. Apply the latest security updates from Microsoft Update. 4. Verify update installation in Windows Update history.
🔧 Temporary Workarounds
Disable macros and ActiveX controls
allPrevents execution of potentially malicious embedded content in Word documents
Use Microsoft Office Viewer
WindowsOpen suspicious documents in read-only mode using Office Viewer instead of full Word application
🧯 If You Can't Patch
- Implement application whitelisting to block unauthorized Word document execution
- Deploy email filtering to block malicious attachments and enable sandboxing for document analysis
🔍 How to Verify
Check if Vulnerable:
Check Word version against Microsoft's security bulletin; vulnerable if running affected versions without patchesCheck Version:
In Word: File > Account > About WordVerify Fix Applied:
Verify Word version matches patched version in Microsoft advisory and check Windows Update history for security update KB number📡 Detection & Monitoring
Log Indicators:
- Word application crashes with memory access violations
- Suspicious child processes spawned from winword.exe
- Unusual document opening from untrusted sources
Network Indicators:
- Outbound connections from Word process to unknown IPs
- DNS requests for suspicious domains following document opening
SIEM Query:
Process Creation where ParentImage contains 'winword.exe' AND (CommandLine contains suspicious patterns OR Image contains unusual executables)