The SUs address vulnerabilities responsibly reported to Microsoft by security partners and found through Microsoft’s internal processes. Our recommendation is to immediately install these updates to protect your environment.

NOTE   The October 2022 SUs do not contain fixes for the zero-day vulnerabilities reported publicly on September 29, 2022 (CVE-2022-41040 and CVE-2022-41082). Please see this blog post to apply mitigations for those vulnerabilities. We will release updates for CVE-2022-41040 and CVE-2022-41082 when they are ready.

Microsoft has released Security Updates (SUs) for vulnerabilities found in:

  • Exchange Server 2013
  • Exchange Server 2016
  • Exchange Server 2019

The October 2022 SUs are available for the following specific versions of Exchange Server:

  • Exchange Server 2013 CU23
  • Exchange Server 2016 CU22 and CU23
  • Exchange Server 2019 CU11 and CU12

Enable Windows Extended Protection

Starting with the August 2022 SUs, Exchange Server supports the Windows Extended Protection (EP) feature, which can help you protect your environments from authentication relay or “man in the middle” (MitM) attacks. If you have not yet enabled EP in your environment, please install the October SUs which address a known issue in Exchange EP support (see below). Then, review the information in the Manual Enablement of Extended Protection section of our August announcement for more details.

Customers who have already installed the August 2022 SUs and have enabled EP do not need to re-run the EP script after installing the October SUs.

Update installation

The following update paths are available:

Update Installation Paths

Reach out to Messageware to improve Microsoft Exchange Server Security

If you are not protecting all the protocols used by your Exchange Server, you’re putting your company at a higher risk of a data breach.

Security incidents happen frequently. They cause disruption, loss of data and potentially risk the reputation of your company. However, if you implement these steps, you’re doing more than most other companies.

Have you heard about Messageware’s EPG that offers advanced Exchange Server security to protect organizations from a variety of logon and password attacks, as well as extensive real-time reporting and alerts of suspicious logon activity? Click here to learn more.