CVE-2025-48804
📋 TL;DR
This vulnerability in Windows BitLocker allows an attacker with physical access to bypass the encryption security feature by mixing untrusted data with trusted data. It affects Windows systems using BitLocker encryption. Attackers need physical access to exploit this vulnerability.
💻 Affected Systems
- Windows BitLocker
📦 What is this software?
Windows 10 1507 by Microsoft
Windows 10 1507 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 11 22h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 24h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete bypass of BitLocker encryption allowing unauthorized access to encrypted data on stolen or lost devices.
Likely Case
Data theft from lost/stolen laptops or workstations where attacker has physical access.
If Mitigated
Limited impact if devices are physically secured and additional authentication factors are required.
🎯 Exploit Status
Requires physical access and technical knowledge of BitLocker implementation details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific KB numbers
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-48804
Restart Required: Yes
Instructions:
1. Apply latest Windows security updates from Microsoft Update
2. Restart system after installation
3. Verify BitLocker is functioning normally
🔧 Temporary Workarounds
Enable Additional Authentication Factors
windowsRequire PIN or USB key in addition to TPM for BitLocker unlock
manage-bde -protectors -add C: -TPMAndPIN
manage-bde -protectors -add C: -TPMAndStartupKey
Disable BitLocker (Not Recommended)
windowsTemporarily disable BitLocker until patch can be applied
manage-bde -off C:
🧯 If You Can't Patch
- Physically secure devices to prevent unauthorized physical access
- Implement full disk encryption with additional authentication factors beyond TPM-only
🔍 How to Verify
Check if Vulnerable:
Check if BitLocker is enabled and system has not applied latest Windows security updatesCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify Windows Update history shows latest security updates installed and BitLocker functions normally📡 Detection & Monitoring
Log Indicators:
- Multiple failed BitLocker unlock attempts
- Unexpected BitLocker recovery mode activations
Network Indicators:
- None - physical access required
SIEM Query:
EventID=4104 OR EventID=4105 from BitLocker events showing unusual unlock patterns