UNPATCHED MS EXCHANGE SERVERS VULNERABLE AGAINST REMOTE ATTACK
When you are using the Microsoft Exchange Server Online, then it is necessary for you to patch it as soon as you can, if you didn't do it till now. The reason for it is that the foreign remote attacks can attack its unpatched services. Yet Microsoft has not disclosed any other way to avoid the threat of the CVE-2020-0688. So, you have to work this way to secure yourself from the remote attacks.