We have up gradated CU 19 for exchange 2016 and Installed exchange security patch 1st march patch 5000871 after getting new April patch we have installed April security patch (5001779). but showing vulnerable after installed April security patch.

We have up gradated CU 19 for exchange 2016 and Installed exchange security patch 1st march patch 5000871 after getting new April patch we have installed April security patch (5001779). but showing vulnerable after installed April security patch.

It is suggested by Microsoft to install the latest security updates to protect your environment. And you are the best practice and you could ignore these warnings for now.
Please refer to the offcial article here: Released: April 2021 Exchange Server Security Updates
Vulnerabilities addressed in the April 2021 security updates were responsibly reported to Microsoft by a security partner. Although we are not aware of any active exploits in the wild, our recommendation is to install these updates immediately to protect your environment.
Do the April 2021 security updates contain the March 2021 security updates for Exchange Server?
Yes, our security updates are cumulative. Customers who installed the March 2021 security updates for supported CUs can install the April 2021 security updates and be protected against the vulnerabilities that were disclosed during both months.
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