CVE-2025-59290
📋 TL;DR
This vulnerability is a use-after-free flaw in the Windows Bluetooth Service that allows an authenticated attacker to execute arbitrary code with elevated SYSTEM privileges on the local machine. It affects Windows systems with Bluetooth functionality enabled. Attackers need local access to exploit this vulnerability.
💻 Affected Systems
- Microsoft Windows
📦 What is this software?
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 system compromise where an attacker gains SYSTEM privileges, enabling installation of persistent malware, credential theft, lateral movement, and full control over the affected system.
Likely Case
Privilege escalation from a standard user account to SYSTEM privileges, allowing attackers to bypass security controls, install additional malware, or access sensitive system resources.
If Mitigated
Limited impact if proper endpoint protection, application control, and least privilege principles are enforced, though the vulnerability still provides a foothold for attackers.
🎯 Exploit Status
Use-after-free vulnerabilities in Windows services are often reliable and easy to exploit once proof-of-concept code is developed. Requires local authenticated access.
🛠️ 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-2025-59290
Restart Required: Yes
Instructions:
1. Apply the latest Windows security updates from Microsoft Update. 2. For enterprise environments, deploy patches through WSUS, SCCM, or Intune. 3. Restart affected systems after patch installation.
🔧 Temporary Workarounds
Disable Bluetooth Service
windowsTemporarily disable the Bluetooth service to prevent exploitation until patches can be applied
sc config bthserv start= disabled
sc stop bthserv
Remove Bluetooth Hardware
windowsPhysically remove or disable Bluetooth adapters in systems where Bluetooth functionality is not required
🧯 If You Can't Patch
- Implement strict endpoint detection and response (EDR) to detect privilege escalation attempts
- Enforce least privilege principles and application control to limit what users can execute
🔍 How to Verify
Check if Vulnerable:
Check if Bluetooth service is running: 'sc query bthserv' and verify Windows version against patched versionsCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify Windows Update history for the relevant security patch and confirm Bluetooth service version has been updated📡 Detection & Monitoring
Log Indicators:
- Event ID 4688 with parent process related to Bluetooth service
- Unexpected privilege escalation events in security logs
- Bluetooth service crashes or unexpected restarts
Network Indicators:
- Unusual Bluetooth pairing attempts or connections
- Suspicious local process communication with Bluetooth service
SIEM Query:
EventID=4688 AND (NewProcessName="*\system32\*" OR ParentProcessName="*bthserv*") AND TokenElevationType="%%1936"