Please upgrade your MikroTik devices to at least 6.42.7, to make sure your device will not be comprised by hackers.
See the following articles for reference:
https://thehackernews.com/2018/08/mikrotik-router-hacking.html
https://blog.mikrotik.com/security/winbox-vulnerability.html
Checking on DataTill what versions your MikroTik devices are on; Go to Devices. Network Devices
