CVE-2024-43540
📋 TL;DR
This vulnerability in the Windows Mobile Broadband Driver allows attackers to cause a denial of service (system crash/BSOD) by sending specially crafted requests. It affects Windows systems with mobile broadband hardware or drivers installed. The vulnerability requires local access or ability to send requests to the driver.
💻 Affected Systems
- Windows
📦 What is this software?
Windows 10 1809 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 11 21h2 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 crash leading to denial of service, requiring manual reboot and potential data loss from unsaved work.
Likely Case
System becomes unresponsive or crashes, disrupting operations until reboot.
If Mitigated
Limited impact with proper access controls and monitoring; system recovers after reboot.
🎯 Exploit Status
Requires ability to send crafted requests to the driver interface. No public exploit code available as of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply latest Windows security updates from Microsoft
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-43540
Restart Required: Yes
Instructions:
1. Open Windows Update settings
2. Click 'Check for updates'
3. Install all available security updates
4. Restart system when prompted
🔧 Temporary Workarounds
Disable Mobile Broadband Interface
windowsDisable mobile broadband hardware/driver if not needed
Open Device Manager
Find Mobile Broadband adapters
Right-click and select 'Disable device'
🧯 If You Can't Patch
- Restrict local access to systems with mobile broadband hardware
- Implement network segmentation to limit exposure of vulnerable systems
🔍 How to Verify
Check if Vulnerable:
Check if system has mobile broadband hardware/drivers installed via Device ManagerCheck Version:
winverVerify Fix Applied:
Verify Windows Update history shows latest security updates installed📡 Detection & Monitoring
Log Indicators:
- System crash/BSOD events in Windows Event Log
- Driver failure events related to mobile broadband
Network Indicators:
- Unusual requests to mobile broadband driver interfaces
SIEM Query:
EventID=41 OR (EventID=1001 AND Source='Windows Error Reporting') AND Description contains 'mobile broadband'