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Today is the first patch day of the year 2021. Microsoft released security updates and non-security updates for the company's Windows operating system and other company products such as Microsoft Office.

In this guide, you will get a full overview of everything that is important in regards to the released updates. We provide you with an executive summary, links to support pages, download links, the list of known issues, the vulnerability distribution of each operating system version that is supported, and more.
Check out the December 2020 Patch overview in case you missed it.

Microsoft Windows Security Updates January 2021You can download the following Excel spreadsheet to your system; it contains a list of released security updates for Microsoft's Windows platform. Click on the following link to download it to your system: Security Updates 2021-01-12-083940pm

Executive Summary

• Microsoft released security updates for all supported client and server Windows products.
  
• No critically rated vulnerabilities for client and server versions of Windows.
  
• Security updates are also available for Microsoft Office, Microsoft Edge, Azure, Visual Studio, Windows Codecs Library, SQL Server, Microsoft Malware Protection Engine, .NET Core, .NET Repository, and ASP .NET
  

Operating System Distribution

• Windows 7  (extended support only): 5 vulnerabilities: 0 critical and 5 important
  
• Windows 8.1: 7 vulnerabilities: 0 rated critical and 7 rated important
  
• Windows 10 version 1809: 13 vulnerabilities: 0 critical and 13 important
  
• Windows 10 version 1903 and 1909: 13 vulnerabilities: 0 critical and 13 important
  
• Windows 10 version 2004 and 20H2: 13 vulnerabilities, 0 critical, 13 important
  

Windows Server products

• Windows Server 2008 R2 (extended support only):5 vulnerabilities: 0 critical and 5 important
  
• Windows Server 2012 R2: 8 vulnerabilities: 0 critical and 8 important.
  
• Windows Server 2016: 8 vulnerabilities: 0 critical and 8 important.
  
• Windows Server 2019: 8 vulnerabilities: 0 critical and 8 important.
  

Other Microsoft Products

• Internet Explorer 11: nothing listed
  
• Microsoft Edge (classic): 1 vulnerabilities: 1 critical
  • CVE-2021-1705 --  Microsoft Edge (HTML-based) Memory Corruption Vulnerability
    
• Microsoft Edge (Chromium)
  • see here (latest security patches from the Chromium project)
    

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