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Windows Server 2016 Windows Server 2016 Out-of-band security update
Out-of-band

KB5070882

KB5070882: Cumulative update for Windows Server, version 2016, October 2025. WSUS remote-code-execution flaw patched; sync error details hidden

In short

Addresses a critical remote code execution vulnerability in WSUS reporting web services. WSUS synchronization error details are temporarily unavailable after installation.

Does it affect you? Applies to: Devices running Windows Server 2016, for which this update is available as an x64 package.

Build
14393.8524
Security
1 fixed · 1 critical
Restart
Required

Microsoft publishes separate notes for this KB for Windows 10.

What changes

Fix 1 change

Windows Server Update Services (WSUS)

  • The remote code execution vulnerability in WSUS reporting web services is addressed.1
    Addresses CVE-2025-59287.

Known issues

  1. Open Affects: Organizations and IT administrators

    Windows Server Update Services (WSUS) does not display error details

    After this update or later updates, WSUS does not display synchronization error details. Microsoft temporarily removed this functionality to address CVE-2025-59287.2

    Workaround status No workaround yet

    Microsoft has not published a manual workaround for this issue yet. Monitor release health until a resolving update is available.

Technical details

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

Data sheet

Released
2025-10-23
Classification
Security Updates
Type
Cumulative update
Restart
Required
Replaces
KB5066836, KB5065427, KB5063871, KB5062560
+10 earlier KB5061010, KB5058383, KB5058921, KB5055521, KB5053594, KB5052006, KB5049993, KB5048671, KB5046612, KB5037423
Replaced by
KB5068864
VersionBuildChannel
2016 14393.8524 General availability

Security

1 vulnerability fixed
1 critical
VulnerabilitySeverityCVSS
CVE-2025-59287
Windows Server Update Service (WSUS) Remote Code Execution Vulnerability
 Critical 9.8

Updated components

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

Sources

Updated
Cited passages from Microsoft's official notes (2)
  1. 1. Fixed: This update addresses a remote code execution (RCE) vulnerability that was identified in WSUS reporting web services. support.microsoft.com
  2. 2. After installing this update or later updates, Windows Server Update Services (WSUS) does not display synchronization error details within its error reporting. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 2 quoted passages · compared with Microsoft's page on Oct 21, 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 5/5, 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