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Windows Server 2022 Windows Server 2022 Out-of-band security update
Out-of-band

KB5070884

KB5070884: Cumulative update for Windows Server, version 2022, October 2025. WSUS remote-code flaw fixed; synchronization error details disappear

In short

Fixes 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 2022, x64.

Build
20348.4297
Security
1 fixed · 1 critical
Restart
Required
Review notes Additional details from the official release notes (1) Read note
  • In detail Secure Boot certificates used by most Windows devices have started expiring in June 2026, but only certain personal and business devices might have trouble booting securely if they are not updated in time.

The official sources are linked at the end of the page.

What changes

Improvements 2 changes

General

For: Windows Server 2022 devices

  • Includes the security fixes and improvements from the October 14, 2025 update, KB5066782.1

Servicing stack

  • The component that installs Windows updates receives quality improvements.2
    Includes servicing stack update KB5066781, build 20348.4285.

Fix 1 change

Windows Server Update Services (WSUS)

  • The remote code execution vulnerability in WSUS reporting web services is addressed.3
    Addresses CVE-2025-59287.

Known issues

  1. Open Affects: Organizations and IT administrators

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

    After installing this update or later updates, WSUS does not display synchronization error details in its error reporting. This functionality is temporarily removed to address CVE-2025-59287.4

    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
KB5066782, KB5065432, KB5063880, KB5062572
+25 earlier KB5060526, KB5061906, KB5058385, KB5059092, KB5058920, KB5055526, KB5053603, KB5051979, KB5052819, KB5049983, KB5048654, KB5046616, KB5047767, KB5044281, KB5042881, KB5041160, KB5040437, KB5041054, KB5039227, KB5037782, KB5036909, KB5037422, KB5035857, KB5034770, KB5034129
Replaced by
KB5068787
VersionBuildChannel
2022 20348.4297 General availability

Security

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

Downloads (Microsoft Update Catalog)

x64 2022
410.0 MB
windows10.0-kb5070884-x64.msu Main update · KB5070884 SHA-1: 33466d5f…950ed5

Updated components

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

Top changed componentsFiles
Secure Boot6
Kernel4
Networking3
Hyper-V and virtualization2
Security and sign-in2

Sources

Updated
Cited passages from Microsoft's official notes (4)
  1. 1. This update is cumulative and includes security fixes and improvements from the October 14, 2025, security update (KB5066782), in addition to the following: 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. Fixed: This update addresses a remote code execution (RCE) vulnerability that was identified in WSUS reporting web services. support.microsoft.com
  4. 4. Windows Server Update Services (WSUS) does not display synchronization error details within its error reporting. This functionality is temporarily removed to address the Remote Code Execution Vulnerability support.microsoft.com
Checked automatically: 8 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: passed

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