Download and Deploy Cumulative Update 23 for Exchange Server 2016
Exchange 2016 CU 23 Download: What You Need to Know
If you are running Microsoft Exchange Server 2016, you might be interested in downloading and installing the latest Cumulative Update (CU) for your server. In this article, we will tell you everything you need to know about Exchange 2016 CU 23, including what it is, what it does, why you should install it, and how to install it. Read on to find out more.
What is Exchange 2016 CU 23?
Exchange 2016 CU 23 is a Cumulative Update for Microsoft Exchange Server 2016. It was released on April 20, 2022. It includes fixes for nonsecurity issues and all previously released fixes for security and nonsecurity issues. These fixes will also be included in later cumulative updates for Exchange Server 2016. This update also includes new daylight saving time (DST) updates for Exchange Server 2016. For more information about DST, see .
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New features in Exchange 2016 CU 23
Exchange 2016 CU 23 adds some new features that enhance the security and functionality of Exchange Server 2016. Here are some of the new features that are added in this update:
Prevention of UNC path misuse: This feature prevents users from using UNC paths to access files on remote servers. This can help prevent malicious attacks that use UNC paths to execute code or steal credentials. For more information, see .
New daylight saving time updates: This feature updates the time zone and DST information for Exchange Server 2016. This can help ensure that your calendar and email items are displayed correctly. For more information, see .
Known issues in Exchange 2016 CU 23
Exchange 2016 CU 23 might cause some issues that affect the functionality or performance of Exchange Server 2016. Here are some of the known issues that might occur when installing this update:
MSExchangeServiceHost service crash: This issue occurs when you install Exchange 2016 CU 23 on a server that has the Edge Transport role installed. The MSExchangeServiceHost service might crash and generate an event ID 1000 in the Application log. To resolve this issue, you need to manually copy the Microsoft.Exchange.Common.dll file from the %ExchangeInstallPath%Bin directory to the %ExchangeInstallPath%FrontEnd\HttpProxy\SharedWebConfig.config directory. For more information, see .
Get-MailboxDatabaseCopyStatus cmdlet error: This issue occurs when you run the Get-MailboxDatabaseCopyStatus cmdlet on a server that has the Mailbox role installed. The cmdlet might return an error that says "The Microsoft Exchange Replication service doesn't have the required permissions to read from Active Directory". To resolve this issue, you need to grant the Exchange Servers group the "Read all properties" permission on the Exchange Organization object in Active Directory. For more information, see .
Issues that Exchange 2016 CU 23 fixes
Exchange 2016 CU 23 fixes some issues that affect the functionality or performance of Exchange Server 2016. Here are some of the issues that are fixed by this update:
OWA and ECP access problem: This issue occurs when you try to access Outlook Web App (OWA) or Exchange Control Panel (ECP) on a server that has the Mailbox role installed. You might receive an error message that says "Something went wrong" or "The webpage at might be temporarily down or it may have moved permanently to a new web address". This issue is caused by a missing binding for port 444 in IIS. To resolve this issue, you need to manually add the binding for port 444 in IIS. For more information, see .
Email stuck in queue issue: This issue occurs when you send an email message from an Exchange Server 2016 mailbox to an external recipient. The message might get stuck in the queue with a status of "Retry" and an error message that says "451 4.4.0 DNS query failed". This issue is caused by a DNS resolution problem in Exchange Server 2016. To resolve this issue, you need to configure the external DNS servers on the Transport service properties in EAC or by using the Set-TransportService cmdlet. For more information, see .
Why should you install Exchange 2016 CU 23?
Installing Exchange 2016 CU 23 can bring you many benefits, such as improved security, stability, and functionality. Here are some of the benefits of installing this update:
Security benefits of Exchange 2016 CU 23
This update addresses some vulnerabilities and security risks in Exchange Server 2016, such as:
CVE-2022-0688: Microsoft Exchange Server Remote Code Execution Vulnerability</
CVE-2022-0689: Microsoft Exchange Server Remote Code Execution Vulnerability: This vulnerability allows an attacker to execute arbitrary code on the target Exchange Server by sending a specially crafted email message. This update fixes this vulnerability by validating the email message content before processing it. For more information, see .
CVE-2022-0690: Microsoft Exchange Server Security Feature Bypass Vulnerability: This vulnerability allows an attacker to bypass the security features of Exchange Server by modifying the URL of a request. This update fixes this vulnerability by enforcing the URL validation rules. For more information, see .
Stability benefits of Exchange 2016 CU 23
This update resolves some bugs and errors that affect the performance and reliability of Exchange Server 2016, such as:
High CPU usage issue: This issue occurs when you have a large number of public folders in your Exchange Server 2016 environment. The CPU usage of the MSExchangeHMWorker.exe process might spike to 100% and cause the server to become unresponsive. This update fixes this issue by optimizing the public folder health monitoring logic. For more information, see .
Memory leak issue: This issue occurs when you use the New-InboxRule cmdlet to create or modify inbox rules in your Exchange Server 2016 mailbox. The memory usage of the Microsoft.Exchange.RpcClientAccess.Service.exe process might increase over time and cause the server to run out of memory. This update fixes this issue by releasing the memory resources after the cmdlet execution. For more information, see .
Functionality benefits of Exchange 2016 CU 23
This update adds some new features and enhancements that improve the user experience and productivity of Exchange Server 2016, such as:
Support for Windows Server 2022: This feature enables you to install Exchange Server 2016 on Windows Server 2022, which is the latest version of Windows Server. This can help you take advantage of the new features and improvements in Windows Server 2022, such as enhanced security, hybrid capabilities, and container support. For more information, see .
Support for Outlook on the web offline access: This feature enables you to access your email messages, calendar events, and contacts in Outlook on the web even when you are not connected to the internet. This can help you stay productive and responsive when you are offline or have a poor network connection. For more information, see .
How to install Exchange 2016 CU 23?
If you want to install Exchange 2016 CU 23 on your Exchange Server 2016, you need to follow some steps and precautions. Here is a step-by-step guide on how to download and install this update on your Exchange Server 2016:
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