CVE-2025-59206 Windows Resilient File System (ReFS) Deduplication Service Elevation of Privilege Vulnerability
A use-after-free flaw in the Windows ReFS Deduplication Service allows attackers to escalate privileges on affected Windows systems.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-59206?
CVE-2025-59206 is a high-severity use after free vulnerability in Microsoft Windows 11 24h2, published on 14 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Windows Resilient File System (ReFS) Deduplication Service Elevation of Privilege Vulnerability
Weakness: CWE-416
Which versions are affected by CVE-2025-59206?
It affects 3 products.
Products include Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows Server 2025.
How do I fix CVE-2025-59206?
No fix has been published for CVE-2025-59206 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2025-59206 being exploited?
There is no known exploitation of CVE-2025-59206 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 11 24h2
- CVE-2025-60710 Microsoft Windows Link Following
- CVE-2026-54990 Remote Desktop Client Remote Code Execution Vulnerability
- CVE-2025-50165 Windows Graphics Component Remote Code Execution Vulnerability
- CVE-2025-21311 Windows NTLM V1 Elevation of Privilege Vulnerability
- CVE-2026-108463 Windows SmartScreen Security Feature Bypass Vulnerability
Sources
Also known as GHSA-v786-hjfg-r469.