Zoom video conferencing software has patched a security loophole that could have allowed anyone to remotely eavesdrop on unprotected active meetings. Zoom now, by default, automatically generates a six-digit numeric password for each meeting you create that participants need to enter when joining by manually entering the meeting ID. Zoom also allows users to set up a session for non-pre-registered participants who can join an active meeting by entering a unique Meeting ID, without requiring a password or going through the Waiting Rooms. To prevent brute force attacks, repeated attempts to scan for meeting IDs will cause a device to be blocked.
Source: https://thehackernews.com/2020/01/zoom-meeting-password.html