Microsoft has released security updates for Microsoft Exchange Server.

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Title: Microsoft Security Update Releases
Issued: March 2, 2021
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Summary
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The following CVEs have undergone a major revision increment:

Critical CVEs
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* CVE-2021-26412 - https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26412 
* CVE-2021-26855 - https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26855 
* CVE-2021-27065 - https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-27065 
* CVE-2021-26857 - https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26857 


Important CVEs
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* CVE-2021-27078 - https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-27078
* CVE-2021-26854 - https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26854 
* CVE-2021-26858 - https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26858 


Publication information
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 - Microsoft Exchange Server Remote Code Execution Vulnerability
 - See preceding list for links
 - Version 1.0
 - Reason for Revision: Information published
 - Originally posted: March 2, 2021
 - Updated: N/A