MSRC-CVE-2025-59206 — Windows Resilient File System (ReFS) Deduplication Service Elevation of Privilege Vulnerability

Summary

Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Unlikely. Customer action: Required.

Details

What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation of this vulnerability requires an attacker to win a race condition.

Security updates
10.0.26200.6899 — https://support.microsoft.com/help/5066835

Vulnerabilities 1

High 7.4

CVE-2025-59206

Windows Resilient File System (ReFS) Deduplication Service Elevation of Privilege Vulnerability

Windows Resilient File System (ReFS) Deduplication Service Elevation of Privilege Vulnerability

Microsoft Windows Server 2025 Windows Server 2025 (Server Core installation) Windows 11 Version 24H2 Windows

Oct 14, 2025

Revision history

2025-10-14 #1
Information published.

References

CVE-2025-59206 Windows Resilient File System (ReFS) Deduplication Service Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59206
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss