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Microsoft has released Security Updates (SUs) for vulnerabilities found in:
- Exchange Server 2013
- Exchange Server 2016
- Exchange Server 2019
SUs are available in a self-extracting auto-elevating .exe package, as well as the original update packages (.msp files), which can be downloaded from the Microsoft Update Catalog.
SUs are available for the following specific versions of Exchange Server:
- Exchange Server 2013 CU23 (note that support and availability of SUs end on April 11, 2023)
- Exchange Server 2016 CU23
- Exchange Server 2019 CU11 and CU12
The March 2023 SUs address vulnerabilities responsibly reported to Microsoft 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.
These vulnerabilities affect Exchange Server. Exchange Online customers are already protected from the vulnerabilities addressed in these SUs and do not need to take any action other than updating Exchange servers in their environment.
More details about specific CVEs can be found in the Security Update Guide (filter on Exchange Server under Product Family).
There is a security update for Microsoft Outlook that is required to address CVE-2023-2337. To address this CVE, you must install the Outlook security update.
After installing the Outlook update, you can use a script we created to see if any of your users have been targeted using the Outlook vulnerability. The script will tell you if any users have been targeted by potentially malicious messages and allow you to modify or delete those messages if any are found.
The following update paths are available:
Known issues with this release
- There are no known issues with this release
Issues resolved in this release
Our organization is in Hybrid mode with Exchange Online. Do we need to do anything?
Exchange Online is already protected, but this SU needs to be installed on your Exchange servers, even if they are used only for management purposes. If you change the auth certificate after installing the March 2023 SU, you should re-run the Hybrid Configuration Wizard.
The last SU we installed is a few months old. Do we need to install all SUs in order, to install the latest one?
SUs are cumulative. If you are running a CU supported by the SU, you do not need to install all SUs in sequential order; simply install the latest SU. Please see this blog post for more information.
Do we need to install SUs on all Exchange Servers within our organization? What about ‘Management Tools only’ machines?
Our recommendation is to install SUs on all Exchange Servers and all servers and workstations running the Exchange Management Tools to ensure compatibility between management tools clients and servers.
This post might receive future updates; they will be listed here (if available).
–The Exchange Server Team
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