As the security agencies have seen an increase in attacks against on-premise Microsoft Exchange servers, recently Microsoft released a one-click mitigation tool to help the customers of both current and out-of-support versions of on-premise Exchange Servers who are unfamiliar with the patch/update process.
Now the company has taken an additional step to further support the customers who are still vulnerable and have not yet implemented the complete security updates. To tackle the critical vulnerabilities in Exchange Server, Microsoft implemented an automatic mitigation tool within Defender Antivirus.