Today is the monthly 'Windows Update' day

by okubax | Flickr

This month too, there was a Windows Update that delivers monthly Windows security updates and bug fixes. Let's update as soon as possible.

We have released the security update for May 2021. See the Security Update Guide for more information. https://t.co/U5eJTOOIIC

— Microsoft Security Team (@JSECTEAM) May 11, 2021

May 2021 Security Update (Monthly) – Microsoft Security Response Center
https://msrc-blog.microsoft.com/2021/05/11/202105-security-updates/

In the May update, Microsoft addressed 55 cybersecurity vulnerabilities, including four critical bugs. Three of them were zero-day vulnerabilities, but Microsoft says there is no evidence of their exploitation so far. This fix resolves security issues such as Internet Explorer, .NET Core, Visual Studio, Windows 10, and Office.

◆ Windows 10 v20H2, v2004, v1909, v1809, v1803
Maximum severity:
emergency

Most impact:
Code is executed remotely

Related Knowledge Base or Support Web Page:
Windows 10 v2004 and Windows 10 v20H2: 5003173
Windows 10 v1909: 5003169
Windows 10 v1809: 5003171
Windows 10 v1803: 5003174

◆ Windows Server 2019, Windows Server 2016, Server Core installation (2019, 2016, v20H2, v2004, v1909)
Maximum severity:
emergency

Most impact:
Code is executed remotely

Related Knowledge Base or Support Web Page:
Windows Server 2019: 5003171
Windows Server 2016: 5003172
Windows Server v2004 and Windows Server v20H2: 5003173
Windows Server v1909: 5003169

◆ Windows 8.1, Windows Server 2012 R2, and Windows Server 2012
Maximum severity:
emergency

Most impact:
Code is executed remotely

Related Knowledge Base or Support Web Page:
Windows 8.1 and Windows Server 2012 R2 Monthly Rollup: 5003209
Windows 8.1 and Windows Server 2012 R2 Security Only: 5003220
Windows Server 2012 Monthly Rollup: 5003208
Windows Server 2012 Security Only: 5003203

◆ Internet Explorer 11
Maximum severity:
emergency

Most impact:
Code is executed remotely

Related Knowledge Base or Support Web Page:
Internet Explorer 11 Cumulative Update: 5003165

◆ Microsoft Office related software
Maximum severity:
important

Most impact:
Code is executed remotely

Related Knowledge Base or Support Web Page:
4464542 , 4493197 , 4493206 , 5001914 , 5001918 , 5001919 , 5001920 , 5001923 , 5001925 , 5001927 , 5001928 , 5001931 , 5001936

◆ Microsoft SharePoint related software
Maximum severity:
important

Most impact:
Code is executed remotely

Related Knowledge Base or Support Web Page:
5001916 5001917 , 5001935

◆ Microsoft Exchange Server
Maximum severity:
important

Most impact:
Code is executed remotely

Related Knowledge Base or Support Web Page:
5003435

◆ Microsoft .NET related software
Maximum severity:
important

Most impact:
Elevation of privilege

Related Knowledge Base or Support Web Page:
For more information about security updates for .NET-related software, see the Security Update Guide https://msrc.microsoft.com/update-guide .

◆ Microsoft Dynamics related software
Maximum severity:
important

Most impact:
Spoofing

Related Knowledge Base or Support Web Page:
For more information about security updates for Dynamics-related software, see the Security Update Guide https://msrc.microsoft.com/update-guide .

◆ Microsoft Visual Studio related software
Maximum severity:
important

Most impact:
Code is executed remotely

Related Knowledge Base or Support Web Page:
For more information about security updates for Visual Studio related software, see https://docs.microsoft.com/en-us/visualstudio and the Security Update Guide https://msrc.microsoft.com/update-guide . Please give me

◆ Microsoft Lync / Skype for Business
Maximum severity:
important

Most impact:
Code is executed remotely

Related Knowledge Base or Support Web Page:
For more information about Lync / Skype for Business security updates, see https://docs.microsoft.com/en-us/SkypeForBusiness/

In addition, Windows Update is released on the second Tuesday of every month in US time, and the next update is scheduled to be provided on June 10, 2021 (Wednesday) in Japan time.