Microsoft Exchange Servers security updates have been released for May 2021.
These updates are available for the following specific builds of Exchange Server:
Exchange Server 2013 CU23
Exchange Server 2016 CU19 and CU20
Exchange Server 2019 CU8 and CU9
Recommendation is to install these updates immediately to protect your environment.
You can installation security patches if you are in the specified Cumulative Update(CU) versions.
If you aren’t in the specified cumulative updates, you must first installation cumulative updates.
Note : Don't double-click the 'MSP file' to run it. Run Command Prompt (not powershell) as an Administrator.
Further Information and Guidance
Exchange Team Blog
Vulnerabilities and Exposures
Security Update Guide
Cumulative Update “Tell me the steps”
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