What is CVE-2025-55687?

CVE-2025-55687 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Windows Resilient File System (ReFS) Elevation of Privilege Vulnerability

Which CVE IDs does CVE-2025-55687 cover?

CVE-2025-55687 covers the following CVE IDs: CVE-2025-55687. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2025-55687?

CVE-2025-55687 has a CVSS v3 base score of 7.4, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2025-55687?

CVE-2025-55687 affects 33 products, including: Windows 10 Version 1607 for 32-bit Systems; Windows 10 Version 1607 for x64-based Systems; Windows 10 Version 1809 for 32-bit Systems; Windows 10 Version 1809 for x64-based Systems; Windows 10 Version 21H2 for 32-bit Systems; and others — see the full list on the advisory page.

CVE-2025-55687HighCVSS 7.4

Windows Resilient File System (ReFS) Elevation of Privilege Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

October 14, 2025

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2025-55687 →

📋 Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Resilient File System (ReFS) allows an unauthorized attacker to elevate privileges locally.

🎯 Affected products33

Windows 10 Version 1607 for 32-bit Systems
Windows 10 Version 1607 for x64-based Systems
Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows 10 Version 21H2 for 32-bit Systems
Windows 10 Version 21H2 for ARM64-based Systems
Windows 10 Version 21H2 for x64-based Systems
Windows 10 Version 22H2 for 32-bit Systems
Windows 10 Version 22H2 for ARM64-based Systems
Windows 10 Version 22H2 for x64-based Systems
Windows 10 for 32-bit Systems
Windows 10 for x64-based Systems
Windows 11 Version 22H2 for ARM64-based Systems
Windows 11 Version 22H2 for x64-based Systems
Windows 11 Version 23H2 for ARM64-based Systems
Windows 11 Version 23H2 for x64-based Systems
Windows 11 Version 24H2 for ARM64-based Systems
Windows 11 Version 24H2 for x64-based Systems
Windows 11 Version 25H2 for ARM64-based Systems
Windows 11 Version 25H2 for x64-based Systems
Windows Server 2012
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2
Windows Server 2012 R2 (Server Core installation)
Windows Server 2016
Windows Server 2016 (Server Core installation)
Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server 2022
Windows Server 2022 (Server Core installation)
+3 more not shown

✅ Remediation

KB5066835 (Security Update) — fixed build 10.0.26200.6899 KB5066586 (Security Update) — fixed build 10.0.17763.7919 KB5066782 (Security Update) — fixed build 10.0.20348.4294 KB5066791 (Security Update) — fixed build 10.0.19044.6456 KB5066793 (Security Update) — fixed build 10.0.22621.6060 KB5066791 (Security Update) — fixed build 10.0.19045.6456 KB5066835 (Security Update) — fixed build 10.0.26100.6899 KB5066793 (Security Update) — fixed build 10.0.22631.6060 KB5066780 (Security Update) — fixed build 10.0.25398.1913 KB5066836 (Security Update) — fixed build 10.0.14393.8519 KB5066837 (Security Update) — fixed build 10.0.10240.21161 KB5066875 (Monthly Rollup) — fixed build 6.2.9200.25722 KB5066873 (Monthly Rollup) — fixed build 6.3.9600.22824

🔗 CVE IDs covered (1)

📋 Description

🎯 Affected products33

✅ Remediation

🔗 References (21)