Last week Microsoft released a Security Update for Exchange 2019 (CU5 and CU6) and Exchange 2016 (CU16 and CU17) that addresses the CVE-2020-16875 vulnerability.

It is recommended to test this update in your lab environment quickly and deploy them in production when no issues are found.

Download locations and KB articles can be found on my https://jaapwesselius.com/exchange page under the Exchange 2019 or Exchange 2016 section.