Today is the monthly 'Windows Update' day.

The monthly Windows Update, which delivers security updates and bug fixes for Windows, has been released. The April 9, 2025 Windows Update includes six updates with a maximum severity of 'Critical' and seven updates with a 'Important' severity.

April 2025 Security Updates (Monthly) | MSRC Blog | Microsoft Security Response Center
https://msrc.microsoft.com/blog/2025/04/202504-security-update/

Microsoft's monthly security updates for April 2025 have been released. By default, updates are automatically applied. For organizations that manage updates, an overview has been published on the blog. Please refer to this and deploy updates as soon as possible. https://t.co/SgsGsy07Ya #Security #Updates #Microsoftpic.twitter.com /GzAZuwxIS5

— Microsoft Security Team (@JSECTEAM) April 9, 2025

◆Windows 11 v24H2, v23H2, v22H2
Maximum Severity:
emergency

The biggest impacts:
Remote code execution possible

Related knowledge base articles or support web pages:
v24H2 5055523
v23H2,v22H2 5055528

◆Windows 10 v22H2
Maximum Severity:
emergency

The biggest impacts:
Remote code execution possible

Related knowledge base articles or support web pages:
5055518

◆Windows Server 2025
Maximum Severity:
emergency

The biggest impacts:
Remote code execution possible

Related knowledge base articles or support web pages:
5055523

◆Windows Server 2022, 23H2
Maximum Severity:
emergency

The biggest impacts:
Remote code execution possible

Related knowledge base articles or support web pages:
Windows Server 2022, 5055518
Windows Server 23H2, 5055527

◆Windows Server 2019, 2016
Maximum Severity:
emergency

The biggest impacts:
Remote code execution possible

Related knowledge base articles or support web pages:
Windows Server 2019, 5055519
Windows Server 2016, 5055521

◆Remote Desktop client for Windows Desktop
Maximum Severity:
important

The biggest impacts:
Remote code execution possible

Related knowledge base articles or support web pages:
https://learn.microsoft.com/windows-server/remote/remote-desktop-services/

◆Microsoft Office
Maximum Severity:
emergency

The biggest impacts:
Remote code execution possible

Related knowledge base articles or support web pages:
https://learn.microsoft.com/officeupdates

◆Microsoft SharePoint
Maximum Severity:
important

The biggest impacts:
Remote code execution possible

Related knowledge base articles or support web pages:
https://learn.microsoft.com/officeupdates/sharepoint-updates

◆Microsoft Dynamics 365
Maximum Severity:
important

The biggest impacts:
Information leakage

Related knowledge base articles or support web pages:
https://learn.microsoft.com/dynamics365

◆Microsoft .NET
Maximum Severity:
important

The biggest impacts:
Denial of Service

Related knowledge base articles or support web pages:
https://learn.microsoft.com/dotnet

◆Microsoft Visual Studio
Maximum Severity:
important

The biggest impacts:
Elevation of privilege

Related knowledge base articles or support web pages:
https://learn.microsoft.com/visualstudio

◆Microsoft Azure
Maximum Severity:
important

The biggest impacts:
Information leakage

Related knowledge base articles or support web pages:
https://learn.microsoft.com/azure

◆System Center
Maximum Severity:
important

The biggest impacts:
Elevation of privilege

Related knowledge base articles or support web pages:
https://learn.microsoft.com/system-center

Additionally, there were no updates to existing vulnerability information or new security advisories released in the April 2025 Windows Update. There was one update to an existing security advisory to inform users that a new version of the servicing stack update was available.

Windows Update is released on the second Tuesday of every month in the United States, and the next update is scheduled to be provided on Wednesday, May 14, 2025, Japan time.