Microsoft Download Center Archive
 | Security Update For Exchange Server 2019 CU12 (KB5015322) |
Security Update For Exchange Server 2019 CU12 (KB5015322)
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.
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Files
 | Status: LiveThis download is still available on microsoft.com. The downloads below will come directly from the Microsoft Download Center. |
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 Exchange2019-KB5015322-x64-en.exe |
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System Requirements
Operating Systems: Windows Server 2019
Exchange Server 2019 System Requirements and Prerequisites
For information about Exchange 2019 system requirements and prerequisites, see the following topics:
Actual requirements will vary based on system configuration. For more detailed system requirements, please refer to the Exchange Server 2019 Technical Documentation Library.
Installation Instructions
We recommend restarting your computer before installing a security update. Then follow these steps:
- Disable the anti-virus software.
- Open an elevated Command Prompt window (not PowerShell) as an administrator, like this:
- Select Start and then enter cmd .
- Right-click Command Prompt in the results and select Run as administrator .
- If the User Account Control dialog box appears, select Yes and then Next .
Note: Do not double-click the 'MSP file' to run it.
If problems occur during or after this installation, please refer to Repair failed installations of Exchange Cumulative and Security updates before contacting Microsoft Support.