I see you are using a very old version of Mendix.
You would need to move up to one of the long term support versions of Mendix as these have security fixes applied to them.
The closest long term support version to yours is 7.23.
More details on long term support can be found here.
https://docs.mendix.com/releasenotes/studio-pro/lts-mts#lts
Mendix published an incident report (updating regularly) for this, maybe it can be helpful;
https://status.mendix.com/incidents/8j5043my610c