CVE-2025-21183HighCVSS 7.4

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

Published
June 3, 2026
Last Modified
—

🔗 CVE IDs covered (1)

CVE-2025-21183 →

📋 Description

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.

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

🎯 Affected products4

  • Windows 11 Version 24H2 for ARM64-based Systems
  • Windows 11 Version 24H2 for x64-based Systems
  • Windows Server 2025
  • Windows Server 2025 (Server Core installation)

✅ Remediation

KB5051987 (Security Update) — fixed build 10.0.26100.3194 KB5052105 (SecurityHotpatchUpdate) — fixed build 10.0.26100.3107

🔗 References (4)