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May 2021 Exchange Server Security Updates

Microsoft released several Security Updates (SUs) for Microsoft Exchange Server to address vulnerabilities. Due to the critical nature of these vulnerabilities, we recommend that customers apply the updates to affected systems immediately to protect the environment.

These vulnerabilities affect Microsoft Exchange Server. Exchange Online is not affected.

Microsoft has released Security Updates for vulnerabilities found in:

  • Exchange Server 2013
  • Exchange Server 2016
  • Exchange Server 2019

These Security Updates are available for the following specific versions of Exchange:

  • Exchange Server 2013 (CU23)
  • Exchange Server 2016 (CU19, CU20)
  • Exchange Server 2019 (CU8, CU9)

Read more on how to Install Exchange Security Update.

If you are not at these Exchange Server CU versions, please update right now and apply the above patch.

Read more on how to Install Cumulative Update Exchange.

Vulnerabilities addressed in the May 2021 Security Updates were responsibly reported by security partners and found through Microsoft’s internal processes. Although we are not aware of any active exploits in the wild, our recommendation is to install these updates immediately to protect your environment.

Further information and guidance  

ALI TAJRAN

ALI TAJRAN

ALI TAJRAN is a passionate IT Architect, IT Consultant, and Microsoft Certified Trainer. He started Information Technology at a very young age, and his goal is to teach and inspire others. Read more »

This Post Has 2 Comments

  1. Hi,

    I have one question for update, what is the best practice for update?
    Manuell to install Exchange 2013-KB5003435-x64-en or from local Windows Update

    Thanks a lot

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