The Microsoft January 2021 security updates have been released and consist of 83 CVEs. Of these 83 CVEs, 10 are rated Critical and 73 are rated Important in severity. At the time of release, CVE-2021-1648 is publicly known and CVE-2021-1647 is known to be actively exploited.
The updates apply to the following: Microsoft Windows, Microsoft Edge (EdgeHTML-based), Microsoft Office and Microsoft Office Services and Web Apps, Microsoft Windows Codecs Library, Visual Studio, SQL Server, Microsoft Malware Protection Engine, NET Core, .NET Repository, ASP .NET, and Azure.
If you are using Windows Update, the latest SSU (KB4598481) will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog. For information about Servicing Stack updates see Servicing Stack Updates (SSU).
The KBs listed below contain information about known issues with the security updates.
| KB Article | Applies To |
|---|---|
| 4598229 | Windows 10, Version 1903, Windows Server, Version 1903, Windows 10, Version 1909, Windows Server, Version 1909 |
| 4598230 | Windows 10, Version 1809, Windows Server 2019 |
| 4598242 | Windows 10, Version 2004, Windows Server, Version 2004, Windows 10, Version 20H2, Windows Server, Version 20H2 |
| 4598275 | Windows 8.1, Windows Server 2012 R2 (Security-only update) |
| 4598278 | Windows Server 2012 (Monthly Rollup) |
| 4598279 | Windows 7, Windows Server 2008 R2 (Monthly Rollup) |
| 4598285 | Windows 8.1, Windows Server 2012 R2 (Monthly Rollup) |
| 4598287 | Windows Server 2008 (Security-only update) |
| 4598288 | Windows Server 2008 (Monthly Rollup) |
| 4598289 | Windows 7, Windows Server 2008 R2 (Security-only update) |
| 4598297 | Windows Server 2012 (Security-only update) |
Recommended Reading:
See Dustin Childs review and analysis in Zero Day Initiative -- The January 2021 Security Update Revuew.
For more information about the updates released today, see the Security Update Guide.
REMINDER: Adobe Flash Player is out of support. For more information, see Adobe Flash end of support on December 31, 2020. Flash content is blocked from running in Flash Player today, January 12, 2021. For more information, see Adobe Flash Player EOL General Information Page.
Additional Update Notes:
- MSRT -- The Malicious Software Removal Tool is now run on a quarterly basis rather than monthly. See Remove specific prevalent malware with Windows Malicious Software Removal Tool.
- Servicing Stack Updates -- A list of the latest servicing stack updates for each operating system can be found in ADV990001. This list will be updated whenever a new servicing stack update is released. It is important to install the latest servicing stack update. Learn more about SSU's in Servicing Stack Updates (SSU)
- Windows 10 updates are cumulative. The monthly security release includes all security fixes for vulnerabilities that affect Windows 10, in addition to non-security updates. The updates are also available via the Microsoft Update Catalog.
- For information on lifecycle and support dates for Windows 10 operating systems, please see Windows Lifecycle Facts Sheet.
- Windows Update History:
References
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