Zscaler Security Advisories

Security Advisory - December 09, 2025

Zscaler protects against 6 new vulnerabilities for Windows

  1. Overview
  2. CVE-2025-59516 – Windows Storage VSP Driver Elevation of Privilege Vulnerability
  3. CVE-2025-59517 – Windows Storage VSP Driver Elevation of Privilege Vulnerability
  4. CVE-2025-62221 – Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
  5. CVE-2025-62454 – Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
  6. CVE-2025-62470 – Windows Common Log File System Driver Elevation of Privilege Vulnerability
  7. CVE-2025-62472 – Windows Remote Access Connection Manager Elevation of Privilege Vulnerability

Zscaler, working with Microsoft through their MAPP program, has proactively deployed protection for the following 6 vulnerabilities included in the December 2025 Microsoft security bulletins. Zscaler will continue to monitor exploits associated with all vulnerabilities in the December release and deploy additional protections, as necessary.

CVE-2025-59516 – Windows Storage VSP Driver Elevation of Privilege Vulnerability

Severity: Important

Subscriptions Required

  • Advanced Cloud Sandbox
  • Advanced Threat Protection

Affected Software

  • Windows Server 2025
  • Windows 11 Version 24H2 for x64-based Systems
  • Windows 11 Version 24H2 for ARM64-based Systems
  • Windows Server 2022, 23H2 Edition (Server Core installation)
  • Windows 11 Version 23H2 for x64-based Systems
  • Windows 11 Version 23H2 for ARM64-based Systems
  • Windows 11 Version 25H2 for x64-based Systems
  • Windows 11 Version 25H2 for ARM64-based Systems
  • Windows Server 2025 (Server Core installation)
  • 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 Version 21H2 for x64-based Systems
  • Windows 10 Version 21H2 for ARM64-based Systems
  • Windows 10 Version 21H2 for 32-bit Systems
  • Windows Server 2022 (Server Core installation)
  • Windows Server 2022
  • Windows Server 2019 (Server Core installation)
  • Windows Server 2019
  • Windows 10 Version 1809 for x64-based Systems
  • Windows 10 Version 1809 for 32-bit Systems

CVE-2025-59517 – Windows Storage VSP Driver Elevation of Privilege Vulnerability

Severity: Important

Subscriptions Required

  • Advanced Threat Protection
  • Advanced Cloud Sandbox

Affected Software

  • Windows Server 2025
  • Windows 11 Version 24H2 for x64-based Systems
  • Windows Server 2016 (Server Core installation)
  • Windows Server 2016
  • Windows 10 Version 1607 for x64-based Systems
  • Windows 10 Version 1607 for 32-bit Systems
  • Windows 11 Version 24H2 for ARM64-based Systems
  • Windows Server 2022, 23H2 Edition (Server Core installation)
  • Windows 11 Version 23H2 for x64-based Systems
  • Windows 11 Version 23H2 for ARM64-based Systems
  • Windows 11 Version 25H2 for x64-based Systems
  • Windows 11 Version 25H2 for ARM64-based Systems
  • Windows Server 2025 (Server Core installation)
  • 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 Version 21H2 for x64-based Systems
  • Windows 10 Version 21H2 for ARM64-based Systems
  • Windows 10 Version 21H2 for 32-bit Systems
  • Windows Server 2022 (Server Core installation)
  • Windows Server 2022
  • Windows Server 2019 (Server Core installation)
  • Windows Server 2019
  • Windows 10 Version 1809 for x64-based Systems
  • Windows 10 Version 1809 for 32-bit Systems

CVE-2025-62221 – Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability

Severity: Important

Subscriptions Required

  • Advanced Cloud Sandbox
  • Advanced Threat Protection

Affected Software

  • Windows Server 2022 (Server Core installation)
  • Windows 11 Version 25H2 for x64-based Systems
  • Windows 11 Version 25H2 for ARM64-based Systems
  • Windows Server 2025 (Server Core installation)
  • Windows 10 Version 22H2 for 32-bit Systems
  • Windows 10 Version 22H2 for x64-based Systems
  • Windows 10 Version 22H2 for ARM64-based Systems
  • Windows 10 Version 21H2 for x64-based Systems
  • Windows 10 Version 21H2 for ARM64-based Systems
  • Windows 10 Version 21H2 for 32-bit Systems
  • Windows 10 Version 1809 for 32-bit Systems
  • Windows Server 2022
  • Windows Server 2019 (Server Core installation)
  • Windows Server 2019
  • Windows 10 Version 1809 for x64-based Systems
  • Windows Server 2025
  • Windows 11 Version 24H2 for x64-based Systems
  • Windows 11 Version 24H2 for ARM64-based Systems
  • Windows 11 Version 23H2 for ARM64-based Systems
  • Windows Server 2022, 23H2 Edition (Server Core installation)
  • Windows 11 Version 23H2 for x64-based Systems

CVE-2025-62454 – Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability

Severity: Important

Subscriptions Required

  • Advanced Cloud Sandbox
  • Advanced Threat Protection

Affected Software

  • Windows Server 2025
  • Windows 11 Version 24H2 for x64-based Systems
  • Windows 11 Version 24H2 for ARM64-based Systems
  • Windows Server 2022, 23H2 Edition (Server Core installation)
  • Windows 11 Version 23H2 for x64-based Systems
  • Windows 11 Version 23H2 for ARM64-based Systems
  • Windows Server 2025 (Server Core installation)
  • 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 Version 21H2 for x64-based Systems
  • Windows 10 Version 21H2 for ARM64-based Systems
  • Windows 10 Version 21H2 for 32-bit Systems
  • Windows Server 2022 (Server Core installation)
  • Windows Server 2022
  • Windows Server 2019 (Server Core installation)
  • Windows Server 2019
  • Windows 10 Version 1809 for x64-based Systems
  • Windows 10 Version 1809 for 32-bit Systems
  • Windows 11 Version 25H2 for x64-based Systems
  • Windows 11 Version 25H2 for ARM64-based Systems

CVE-2025-62470 – Windows Common Log File System Driver Elevation of Privilege Vulnerability

Severity: Important

Subscriptions Required

  • Advanced Cloud Sandbox
  • Advanced Threat Protection

Affected Software

  • Windows 11 Version 25H2 for x64-based Systems
  • Windows 11 Version 25H2 for ARM64-based Systems
  • Windows Server 2012 R2 (Server Core installation)
  • Windows Server 2012 R2
  • Windows Server 2012 (Server Core installation)
  • Windows Server 2012
  • Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
  • Windows Server 2008 R2 for x64-based Systems Service Pack 1
  • Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
  • Windows Server 2008 for x64-based Systems Service Pack 2
  • Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
  • Windows Server 2008 for 32-bit Systems Service Pack 2
  • Windows Server 2016 (Server Core installation)
  • Windows Server 2016
  • Windows 10 Version 1607 for x64-based Systems
  • Windows 10 Version 1607 for 32-bit Systems
  • Windows Server 2025
  • Windows 11 Version 24H2 for x64-based Systems
  • Windows 11 Version 24H2 for ARM64-based Systems
  • Windows Server 2022, 23H2 Edition (Server Core installation)
  • Windows 11 Version 23H2 for x64-based Systems
  • Windows 11 Version 23H2 for ARM64-based Systems
  • Windows Server 2025 (Server Core installation)
  • 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 Version 21H2 for x64-based Systems
  • Windows 10 Version 21H2 for ARM64-based Systems
  • Windows 10 Version 21H2 for 32-bit Systems
  • Windows Server 2022 (Server Core installation)
  • Windows Server 2022
  • Windows Server 2019 (Server Core installation)
  • Windows Server 2019
  • Windows 10 Version 1809 for x64-based Systems
  • Windows 10 Version 1809 for 32-bit Systems

CVE-2025-62472 – Windows Remote Access Connection Manager Elevation of Privilege Vulnerability

Severity: Important

Subscriptions Required

  • Advanced Cloud Sandbox
  • Advanced Threat Protection

Affected Software

  • Windows Server 2012 R2 (Server Core installation)
  • Windows Server 2012 R2
  • Windows Server 2012 (Server Core installation)
  • Windows Server 2012
  • Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
  • Windows Server 2008 R2 for x64-based Systems Service Pack 1
  • Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
  • Windows Server 2008 for x64-based Systems Service Pack 2
  • Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
  • Windows Server 2008 for 32-bit Systems Service Pack 2
  • Windows Server 2016 (Server Core installation)
  • Windows Server 2016
  • Windows 10 Version 1607 for x64-based Systems
  • Windows 10 Version 1607 for 32-bit Systems
  • Windows Server 2025
  • Windows 11 Version 24H2 for x64-based Systems
  • Windows 11 Version 24H2 for ARM64-based Systems
  • Windows Server 2022, 23H2 Edition (Server Core installation)
  • Windows 11 Version 23H2 for x64-based Systems
  • Windows 11 Version 23H2 for ARM64-based Systems
  • Windows 11 Version 25H2 for x64-based Systems
  • Windows 11 Version 25H2 for ARM64-based Systems
  • Windows Server 2025 (Server Core installation)
  • 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 Version 21H2 for x64-based Systems
  • Windows 10 Version 21H2 for ARM64-based Systems
  • Windows 10 Version 21H2 for 32-bit Systems
  • Windows Server 2022 (Server Core installation)
  • Windows Server 2022
  • Windows Server 2019 (Server Core installation)
  • Windows Server 2019
  • Windows 10 Version 1809 for x64-based Systems
  • Windows 10 Version 1809 for 32-bit Systems