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Cumulative Update 8 for Exchange Server 2019

Microsoft released Cumulative Update 8 for Exchange Server 2019 (KB4588885) on December 15, 2020. Also known as Exchange Server 2019 CU8. This cumulative update 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 2019. This update also resolves vulnerabilities, see Microsoft Common Vulnerabilities and Exposures CVE-2020-17117, CVE-2020-17132, CVE-2020-17141, CVE-2020-17142, CVE-2020-17143.

How to update Exchange Server 2019 to CU8?

It’s recommended to update the Exchange Server in the lab environment before updating it in the production environment.

  1. Download Cumulative Update CU8 for Exchange Server 2019 (KB4588885)
  2. Update to Microsoft .NET Framework 4.8
  3. Install Exchange Cumulative Update

Cumulative Update CU8 for Exchange Server 2019 is released as version 15.02.0792.003. Which version are you running now? Read more on how to find your Exchange version build number.

Known issues in Cumulative Update 8

In multidomain Active Directory forests in which Exchange is installed or has been prepared previously by using the /PrepareDomain option in Setup, this action must be completed after the /PrepareAD command for this cumulative update has been completed and the changes are replicated to all domains. Setup will try to run the /PrepareAD command during the first server installation. Installation will finish only if the user who initiated Setup has the appropriate permissions.

Issues fixed in Cumulative Update 8

This cumulative update fixes the issues that are described in the following Microsoft Knowledge Base articles:

  • 4588297 Attachments can’t be downloaded or previewed from Outlook Web App
  • 4583531 Design change about inline images will be forced to download but not open in a new tab of OWA in Exchange Server 2019
  • 4583532 ELC MRM archiving fails due to DomainName in AuthServer in Exchange Server 2019
  • 4583533 Exchange Server 2019 installation fails with error “The user has insufficient access rights”
  • 4583534 Event ID 65535 System.Runtime.Serialization errors in Application log in Exchange Server 2019
  • 4583535 New-Moverequest, Resume-Moverequest, and Remove-Moverequest not logged in Audit logs in Exchange Server 2019
  • 4583536 Set-MailboxFolderPermission is included in Mail Recipient Creation in Exchange Server 2019
  • 4583537 Update Korean word breaker in Exchange Server 2019
  • 4583538 Microsoft Teams REST calls exceed the default value of maxQueryStringLength in Exchange Server 2019
  • 4583539 Non-breaking space is visible in message body in Outlook in Exchange Server 2019
  • 4583542 Server assisted search in Outlook doesn’t return more than 175 items in Exchange Server 2019
  • 4583544 Lots of LDAP requests for FE MAPI w3wp lead to DDoS on DCs in Exchange Server 2019
  • 4583545 Make DomainName in Authserver a multivalued parameter in Exchange Server 2019
  • 4593465 Description of the security update for Microsoft Exchange Server 2019 and 2016: December 8, 2020


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 »

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