Today is the monthly 'Windows Update' day

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 January 2021 security update. See the Security Update Guide for more information. https://t.co/U5eJTOOIIC

— Microsoft Security Team (@JSECTEAM) January 12, 2021

'January 2021 Security Updates (Monthly)' describes the security updates released this month. https://t.co/WmgYpXkcIv

— Microsoft Security Team (@JSECTEAM) January 12, 2021

◆ 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: 4598242
Windows 10 v1909: 4598229
Windows 10 v1809: 4598230
Windows 10 v1803: 4598245

◆ 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: 4598230
Windows Server 2016: 4598243
Windows Server v2004 and Windows Server v20H2: 4598242
Windows Server v1909: 4598229

◆ 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: 4598285
Windows 8.1 and Windows Server 2012 R2 Security Only: 4598275
Windows Server 2012 Monthly Rollup: 4598278
Windows Server 2012 Security Only: 4598297

◆ Microsoft Office related software
Maximum severity:
important

Most impact:
Code is executed remotely

Related Knowledge Base or Support Web Page:
Knowledge Base article related to Microsoft Office-related software: 4493156 , 4486736 , 4486755 , 4486759 , 4486762 , 4486764 , 4493142 , 4493143 , 4493145 , 4493160 , 4493165 , 4493168 , 4493171 , 4493176 , 4493181 , 4493183 , 4493186

◆ Microsoft SharePoint related software
Maximum severity:
important

Most impact:
Code is executed remotely

Related Knowledge Base or Support Web Page:
Knowledge Base Articles Related to Microsoft SharePoint Related Software: 4486683 , 4486724 , 4493161 , 4493162 , 4493163 , 4493167 , 4493175 , 4493178 , 4493187

◆ Microsoft .NET related software
Maximum severity:
important

Most impact:
Service denial

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

◆ Microsoft SQL Server related software
Maximum severity:
important

Most impact:
Elevation of privilege

Related Knowledge Base or Support Web Page:
Knowledge Base Articles Related to Microsoft SQL Server Related Software: 4583456 , 4583457 , 4583458 , 4583459 , 4583460 , 4583461 , 4583462 , 4583463 , 4583465

◆ Microsoft Visual Studio related software
Maximum severity:
important

Most impact:
Code is executed remotely

Related Knowledge Base or Support Web Page:
Knowledge Base article related to software related to Microsoft Visual Studio: 4584787

◆ Microsoft Malware Protection Engine
Maximum severity:
emergency

Most impact:
Code is executed remotely

Related Knowledge Base or Support Web Page:
For more information about Microsoft Malware Protection Engine security updates, see the Security Update Guide. https://msrc.microsoft.com/update-guide

Windows Update is released on the second Tuesday of every month in US time, and the next update will be available on Wednesday, February 10, 2021 in Japan time.