Microsoft Windows Security Updates for April 2025 are now available

[harlan4096]

It is the second Tuesday of the month and that means Microsoft has released security updates for Windows and other company products like Office. Our overview gives regular users and system administrators an overview of what has been released.

It includes information about known issues, new features, links to downloads, an Excel spreadsheet with information about the updates and much more.

Microsoft Windows Security Updates: March 2025You may download the following Excel spreadsheet to get a list of released updates. Click on the following link to download the archive to the local device: Windows security updates april 2025

Executive Summary

• Microsoft released a total of 126 security updates for various Microsoft products and 9 security update for non-Microsoft issues (e.g. Chromium).
  
• Windows clients with issues:
  • Windows 10 version 1809, 21H2, 22H2
    
  • Windows 11 version 22H2, 23H2, and 24H2
    
• Windows Server clients with issues:
  • Windows Server 2008
    
  • Windows Server 2019
    
  • Windows Server 2022
    

Product overviewEach supported version of Windows and their critical vulnerabilities are listed below.

• Windows 10 version 22H2: 60 vulnerabilities, 4 critical, 56 important
  • Windows Lightweight Directory Access Protocol (LDAP) Remote Code Execution Vulnerability -- CVE-2025-26663
    
  • Lightweight Directory Access Protocol (LDAP) Client Remote Code Execution Vulnerability --
    CVE-2025-26670
    
  • Windows TCP/IP Remote Code Execution Vulnerability -- CVE-2025-26686
    
  • Windows Hyper-V Remote Code Execution Vulnerability -- CVE-2025-27491
    
• Windows 11 version 22H2 and 23H2: 66 vulnerabilities, 2 critical, 64 important
  • Windows Lightweight Directory Access Protocol (LDAP) Remote Code Execution Vulnerability -- CVE-2025-26663
    
  • Lightweight Directory Access Protocol (LDAP) Client Remote Code Execution Vulnerability --
    CVE-2025-26670
    
  • Windows Hyper-V Remote Code Execution Vulnerability -- CVE-2025-27491
    
• Windows 11 version 24H2: 66 vulnerabilities, 3 critical, 30 important
  • Same as Windows 11, Version 22H3.
    

Windows Server products

• Windows Server 2008 R2 (extended support only): 39 vulnerabilities: 3 critical,  36 important
  • Windows Lightweight Directory Access Protocol (LDAP) Remote Code Execution Vulnerability -- CVE-2025-26663
    
  • Lightweight Directory Access Protocol (LDAP) Client Remote Code Execution Vulnerability --
    CVE-2025-26670
    
  • Windows TCP/IP Remote Code Execution Vulnerability -- CVE-2025-26686
    
• Windows Server 2016: 60 vulnerabilities: 6 critical, 54 important
  • Windows Lightweight Directory Access Protocol (LDAP) Remote Code Execution Vulnerability -- CVE-2025-26663
    
  • Lightweight Directory Access Protocol (LDAP) Client Remote Code Execution Vulnerability --
    CVE-2025-26670
    
  • Windows TCP/IP Remote Code Execution Vulnerability -- CVE-2025-26686
    
  • Windows Remote Desktop Services Remote Code Execution Vulnerability -- CVE-2025-27480
    
  • Windows Remote Desktop Services Remote Code Execution Vulnerability -- CVE-2025-27482
    
  • Windows Hyper-V Remote Code Execution Vulnerability -- CVE-2025-27491
    
• Windows Server 2019: 74 vulnerabilities: 6 critical, 68 important
  • Same as Windows Server 2016
    
• Windows Server 2022: 76 vulnerabilities: 5 critical, 29 important
  • Same as Windows Server 2016
    
• Windows Server 2025:  82  vulnerabilities: 6 critical, 76 important
  • Same as Windows Server 2016
    

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