The Microsoft April 2021 security updates have been released and consist of 114 CVEs. The updates apply to the long list of products, features and roles that can be found in the April Security Updates Guide. Of these 89 CVEs, 19 are rated Critical, 89, and 1 is rated Important in severity. Six additional bugs impact Chromium-based Edge.
According to Microsoft, one bug is currently being exploited while four others are publicly known at the time of release. In addition, CVE-2021-28310 is listed as being actively exploited.
The updates released today will automatically remove Edge Legacy which is out of support and replace it with the new Chromium-based Edge. In the event you still use legacy Edge or if you have blocked the Chromium Edge update using group policies/registry hacks, those settings will be ignored and the legacy version will be removed automatically.
Important Note For Windows 10, Version 2004 and Windows 10, Version 20H2:
Before installing this update
Prerequisite: Microsoft now combines the
latest servicing stack update (SSU) for your operating system with the latest
cumulative update (LCU). If you encounter the error, 0x800f0823 –
CBS_E_NEW_SERVICING_STACK_REQUIRED, close the error message and install the
last standalone SSU (KB4598481) before installing this LCU. You will not
need to install this SSU (KB4598481) again for future updates.
For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.
For Windows 10 Version 1909, see KB5001337.
The KBs listed below contain information about known issues with the security updates:
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KB Article |
Applies To |
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SharePoint Server 2019 Language Pack |
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SharePoint Server 2019 |
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Windows 10, Version 2004, Windows Server, Version 2004, Windows 10, Version 20H2, Windows Server, Version 20H2 |
|
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Windows Server 2008 (Security-only update) |
|
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Windows 7, Windows Server 2008 R2 (Monthly Rollup) |
|
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Windows 10, Version 1909, Windows Server, Version 1909 |
|
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Windows 10, Version 1809, Windows Server 2019 |
|
|
Windows 10, Version 1607, Windows Server 2016 |
|
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Windows 8.1, Windows RT 8.1, Windows Server 2012 R2 (Monthly Rollup) |
|
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Windows Server 2012 (Security-only update) |
|
|
Windows Server 2012 (Monthly Rollup) |
|
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Windows Server 2008 (Monthly Rollup) |
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Windows 7, Windows Server 2008 R2 (Security-only update) |
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Windows 8.1, Windows RT 8.1, Windows Server 2012 R2 (Security-only update) |
|
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Microosft Exchange Server 2019, 2016, 2013 |
Recommended Reading: See Dustin Childs review and analysis in Zero Day Initiative -- TheApril 2021 Security Update Review.
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.
- 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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