Security Update For Exchange Server 2019 CU12 SU6 (KB5023038)

A remote code execution vulnerability exists in Microsoft Exchange software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the System user. An attacker could then install programs; view, change, or delete data; or create new accounts.

Supported Operating Systems

Windows Server 2019, Windows Server 2022

Exchange Server 2019 System Requirements and Prerequisites
For information about Exchange 2019 system requirements and prerequisites, see the following topics:

• Exchange 2019 System Requirements
• Exchange 2019 Prerequisites

Actual requirements will vary based on system configuration. For more detailed system requirements, please refer to the Exchange Server 2019 Technical Documentation Library.

We recommend that you restart your computer before you install a security update. Then, follow these steps:

1. Temporarily disable any anti-virus software.
2. To start the download, select the Download button, and then do one of the following:

• To start the installation immediately, select Run.
• To copy the download file to your computer for installation at a later time, select Save.
  

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3. After the installation is completed, re-enable the antivirus software, and then restart your computer. (The installation program may prompt you to restart. We strongly recommend that you restart the computer even if you are not prompted to do this.)

If problems occur during or after the installation, please see Repair failed installations of Exchange Cumulative and Security updates before you contact Microsoft Support.