CVE-2026-25174
📋 TL;DR
CVE-2026-25174 is an out-of-bounds read vulnerability in Windows Extensible File Allocation that allows authenticated attackers to read memory beyond allocated boundaries. This can lead to local privilege escalation on affected Windows systems. Only users with valid local credentials can exploit this vulnerability.
💻 Affected Systems
- Windows Extensible File Allocation component
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker could read sensitive kernel memory, bypass security boundaries, and gain SYSTEM-level privileges on the compromised machine.
Likely Case
An attacker with standard user access could elevate to administrative privileges, enabling installation of malware, data theft, or lateral movement within the network.
If Mitigated
With proper access controls and least privilege principles, impact is limited to the compromised user account without privilege escalation.
🎯 Exploit Status
Requires authenticated access and knowledge of memory manipulation techniques. No public exploit code known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: To be determined from Microsoft's monthly security updates
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-25174
Restart Required: Yes
Instructions:
1. Check Microsoft's security advisory for affected versions. 2. Apply the latest Windows security updates via Windows Update. 3. Restart the system as required.
🔧 Temporary Workarounds
Restrict local user privileges
windowsImplement least privilege by removing administrative rights from standard user accounts
Enable Windows Defender Exploit Guard
windowsUse exploit protection to mitigate memory corruption attacks
🧯 If You Can't Patch
- Implement strict access controls and limit local administrative privileges
- Monitor for suspicious privilege escalation attempts using security tools
🔍 How to Verify
Check if Vulnerable:
Check Windows version and compare against Microsoft's affected versions list in the advisoryCheck Version:
wmic os get caption, version, buildnumberVerify Fix Applied:
Verify Windows Update history shows the relevant security update installed and system version matches patched version📡 Detection & Monitoring
Log Indicators:
- Unexpected privilege escalation events in Windows Security logs
- Process creation with elevated privileges from standard user accounts
Network Indicators:
- None - this is a local attack
SIEM Query:
EventID=4672 AND SubjectUserName!=SYSTEM AND SubjectDomainName!=NT AUTHORITY