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Windows Server 2016 Windows Server 2016 Security update
Patch Tuesday Zero-day

KB5052006

KB5052006: Cumulative update for Windows Server, version 2016, February 2025. USB camera status and audio playback issues fixed

In short

The update fixes a USB camera status problem and USB audio failures, including a playback issue more likely with some DAC drivers. It also closes 33 vulnerabilities, including one critical flaw and two being exploited.

Does it affect you? Applies to: Devices running Windows Server 2016, across all editions.

Build
14393.7785
Security
33 fixed · 1 critical · 2 exploited
Restart
Required

Microsoft publishes separate notes for this KB for Windows 10.

What changes

Fixes 3 changes

USB cameras

  • Devices recognize when the camera is on again after the January 2025 security update.1

USB audio device drivers

Verified in package
  • Certain external audio management devices no longer show a code 10 “This device cannot start” error when connected.2

Digital/Analog converter (DAC)

Verified in package
  • USB audio devices that might stop working and interrupt playback are addressed. This is more likely with a DAC audio driver based on USB 1.0.3

Technical details

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

Data sheet

Released
2025-02-11
Classification
Security Updates
Type
Cumulative update
Restart
Required
Replaces
KB5049993, KB5048671, KB5046612, KB5037423
Replaced by
KB5053594
VersionBuildChannel
2016 14393.7785 General availability

Security

33 vulnerabilities fixed
2 exploited 1 critical 32 important
VulnerabilitySeverityCVSS
CVE-2025-21418 Exploited
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
 Important 7.8
CVE-2025-21391 Exploited
Windows Storage Elevation of Privilege Vulnerability
 Important 7.1
CVE-2025-21376
Windows Lightweight Directory Access Protocol (LDAP) Remote Code Execution Vulnerability
 Critical 8.1
CVE-2025-21377
NTLM Hash Disclosure Spoofing Vulnerability
 Important 6.5

The table lists the 4 exploited, publicly disclosed or critical vulnerabilities. See all 33 vulnerabilities →

Updated components

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

Top changed componentsFiles
Hyper-V and virtualization5
Remote Desktop5
Search4
Secure Boot4
Storage and file systems4
File Explorer and shell3
Graphics and display3
Security and sign-in3
Audio2
Networking2
Settings2
Kernel1

Verified in package: changed files confirm USB audio device drivers, Digital/Analog converter (DAC).

Sources

Updated
Cited passages from Microsoft's official notes (3)
  1. 1. [USB cameras] Fixed: Your device does not recognize the camera is on. This issue occurs after you install the January 2025 security update. support.microsoft.com
  2. 2. [USB audio device drivers] Fixed: The code 10 error message, “This device cannot start” appears. This occurs when you connect to certain external audio management devices. support.microsoft.com
  3. 3. [Digital/Analog converter (DAC) (known issue)] Fixed: You might experience issues with USB audio devices. This is more likely when you use a DAC audio driver based on USB 1.0. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 3 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: passed

A second AI read the text against the sources: correctness 4/5, clarity 4/5, 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