CVE-2024-43520
📋 TL;DR
This Windows kernel vulnerability allows attackers to cause a denial of service (system crash/BSOD) by exploiting a NULL pointer dereference. It affects Windows systems with the vulnerable kernel component. Attackers need local access to exploit this vulnerability.
💻 Affected Systems
- Windows
📦 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 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 requiring reboot, potentially causing data loss or service disruption
Likely Case
Local denial of service resulting in system instability or temporary unavailability
If Mitigated
Minimal impact with proper access controls preventing unauthorized local execution
🎯 Exploit Status
Requires local access and ability to execute code; no known public exploits
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft's monthly security updates for specific KB numbers
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-43520
Restart Required: Yes
Instructions:
1. Open Windows Update settings
2. Check for updates
3. Install all available security updates
4. Restart system when prompted
🔧 Temporary Workarounds
Restrict local access
windowsLimit local user privileges and implement least privilege access controls
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized local code execution
- Monitor for system crashes and investigate any unexpected reboots
🔍 How to Verify
Check if Vulnerable:
Check Windows Update history for missing security patches or use Microsoft's Security Update GuideCheck Version:
wmic os get caption, version, buildnumber, csdversionVerify Fix Applied:
Verify the latest security updates are installed via Windows Update history📡 Detection & Monitoring
Log Indicators:
- System crash logs (Event ID 41)
- Unexpected system reboots
- Kernel panic events
Network Indicators:
- None - local exploit only
SIEM Query:
EventID=41 OR (EventID=6008 AND Source="EventLog")