Yes but most bots are scanning for common ports. It’s far too slow to scan 65k ports on every host. Even things like shodan only scan a handful of common ports. But you can test this yourself, expose SSH on a port number in 20-40ks, I’ve seen several weeks without a single probe.
If you’ve ever done mass scanning you know that’s minutes is not going to to be a full scan and if you are trying to do 65k ports in a few minutes, your results will not be accurate.
Honestly, all applications are vulnerable AF, especially the open source projects without a major team behind them. I work in a security research team and we find critical bugs like this in a weekly basis. Even in major projects which you would be scared to know about. I personally wouldn’t expose anything except SSH or a VPN, or if I have to expose a web app, it’s going inside a VLAN with very restrictive firewall rules, proper logging, and a reverse proxy enforcing authentication via an OIDC based IDP.
We generally spend a couple of days to a week before finding something critical allowing RCE.