Released: March 2022 Exchange Server Security Updates

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Microsoft has released security updates (SUs) that resolve vulnerabilities found in:

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

IMPORTANT: When manually installing SUs, you must install the .msp file from an elevated command prompt (see the Known Issues area in the KB).

These SUs are available for the following specific builds of Exchange Server:

The March 2022 SUs for Exchange Server address vulnerabilities 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.

These vulnerabilities affect on-premises Exchange Server, including servers used by customers in Exchange Hybrid mode. Exchange Online customers are protected from the vulnerabilities addressed in these SUs and do not need to take any action other than updating any on-premises Exchange servers.

More details about specific CVEs can be found in Security Update Guide (filter on Exchange Server under Product Family).

Update installation

Two update paths are available:


Inventory your Exchange Servers / determine which updates are needed

Use the latest version of the Exchange Server Health Checker script to inventory your servers. Running this script will tell you if any of your Exchange Servers need CUs or SUs.

Update to the latest Cumulative Update

Go to and choose your currently running CU and your target CU to get update instructions.

If you encounter errors during or after installation of Exchange Server updates

If you encounter errors during installation, use the SetupAssist script. If something does not work properly after updating, see Repair failed installations of Exchange Cumulative and Security updates.

Known issues with this release

We are not aware of any known issues with this release.


My organization is in Hybrid mode with Exchange Online. Do I need to do anything?
While Exchange Online customers are already protected, the March 2022 SUs do need to be applied to your on-premises Exchange Servers. You do not need to re-run the Hybrid Configuration Wizard (HCW) after applying updates.

Do I need to install the updates on ‘Exchange Management Tools only’ workstations?
Servers or workstations running only the Management Tools role (no Exchange services) do not need these updates.

NOTE: This post might receive future updates; they will be listed here (if available).


The Exchange Team

Read full article (Microsoft Exchange Blog)

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