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Windows Server 2019 Windows Server 2019 Security update
Patch Tuesday Zero-day

KB5071544

KB5071544: Cumulative update for Windows Server, version 2019, December 2025. Closes exploited Cloud Files flaw; People icon stops responding

In short

The update closes exploited CVE-2025-62221 in the Cloud Files Mini Filter Driver, adds a script-risk prompt to PowerShell 5.1 web requests, and makes the People taskbar icon unresponsive.

Does it affect you? Applies to: Devices running Windows Server 2019, for which this update is available as an x64 package.

Build
17763.8146
Security
26 fixed · 1 exploited
Restart
Required

Microsoft publishes separate notes for this KB for Windows 10.

What changes

Improvements 2 changes

PowerShell 5.1

  • PowerShell warns you about script execution risks before an Invoke-WebRequest request continues. You can choose to continue or cancel.1
    The confirmation prompt applies to the Invoke-WebRequest command.

Servicing stack

  • The component that installs Windows updates receives quality improvements.2
    The cumulative update includes servicing stack update KB5070248, build 17763.8020.

Removal 1 change

People app

  • The People icon on the taskbar no longer responds because the feature is being deprecated.3
    Applies to Windows Server 2019 and Windows 10, version 1809.

Known issues

  1. Resolved Affects: Organizations and IT administrators Resolved by KB5074975

    Message Queuing (MSMQ)

    After installing this update, MSMQ queues might become inactive, IIS sites might fail with resource errors, and applications might be unable to write to queues. This primarily affects enterprise or managed IT environments. Microsoft says the issue was resolved by an out-of-band update released on and after December 18, 2025, such as KB5074975.4

    Resolution Fixed in KB5074975

    Install KB5074975 (or a later cumulative update) on affected devices. No manual workaround is required after updating.

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2025-12-09
Classification
Security Updates
Type
Cumulative update
Restart
Required
Replaces
KB5068791, KB5070883, KB5066586, KB5065428
+10 earlier KB5066187, KB5063877, KB5062557, KB5060531, KB5061978, KB5058392, KB5059091, KB5058922, KB5050008, KB5037425
Replaced by
KB5074975
VersionBuildChannel
2019 17763.8146 General availability

Security

26 vulnerabilities fixed
1 exploited 26 important
VulnerabilitySeverityCVSS
CVE-2025-62221 Exploited
Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-62549
Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
 Important 8.8
CVE-2025-54100
PowerShell Remote Code Execution Vulnerability
 Important 7.8
CVE-2025-55233
Windows Projected File System Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-59516
Windows Storage VSP Driver Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-59517
Windows Storage VSP Driver Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-62454
Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-62455
Microsoft Message Queuing (MSMQ) Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-62457
Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-62458
Win32k Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-62461
Windows Projected File System Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-62462
Windows Projected File System Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-62464
Windows Projected File System Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-62466
Windows Client-Side Caching Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-62467
Windows Projected File System Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-62470
Windows Common Log File System Driver Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-62472
Windows Remote Access Connection Manager Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-62474
Windows Remote Access Connection Manager Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-62571
Windows Installer Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-64661
Windows Shell Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-64673
Windows Storage VSP Driver Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-64658
Windows File Explorer Elevation of Privilege Vulnerability
 Important 7.5
CVE-2025-62565
Windows File Explorer Elevation of Privilege Vulnerability
 Important 7.3
CVE-2025-62573
DirectX Graphics Kernel Elevation of Privilege Vulnerability
 Important 7.0
CVE-2025-62473
Windows Routing and Remote Access Service (RRAS) Information Disclosure Vulnerability
 Important 6.5
CVE-2025-62567
Windows Hyper-V Denial of Service Vulnerability
 Important 5.3

Downloads (Microsoft Update Catalog)

x64 2019
712.5 MB
windows10.0-kb5071544-x64.msu Main update · KB5071544 SHA-1: 5fa88343…995ee7

Updated components

158 files changed since the previous update for the same versions.

Top changed componentsFiles
Graphics and display6
File Explorer and shell5
Hyper-V and virtualization3
Kernel3
Secure Boot3
Security and sign-in3
Storage and file systems2
Search1
Settings1

Sources

Updated
Cited passages from Microsoft's official notes (4)
  1. 1. The Invoke-WebRequest command now includes a confirmation prompt with a security warning of a script execution risk. You can choose to continue or cancel the request. support.microsoft.com
  2. 2. This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. support.microsoft.com
  3. 3. After installing this update, the People icon on the taskbar will no longer respond. This feature is being deprecated in Windows Server 2019 and Windows 10, version 1809. support.microsoft.com
  4. 4. This issue was resolved by the Windows out-of-band update released on and after December 18, 2025 (such as KB5074975). support.microsoft.com
Checked automatically: 7 of 8 checks passed, 4 quoted passages · compared with Microsoft's page on Oct 20, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: not passed

A second AI read the text against the sources: correctness 4/5, clarity 5/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake