There must be a way to open ports on your modem (that is NAT forwarding). If no port is open, there is no way to gain access to your server. If a port is open, then there might be a way for an intruder to get into your network. The reality is a bit more complex (man in the middle, ...) but it would make sense only if your data is of value or if someone means you harm.
this post was submitted on 18 Oct 2023
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Make sure upnp is not enabled on your modem/router. Scan your public IP from the outside, or use shields up to see if anything is exposed.
UPnP got me some lovely ransomware once. Never again.
If you didn’t specifically open ports on your router, you’re starting off pretty well. Now software on the Fedora box could be reaching out to the internet opening ports, possibly misconfigured, but that’s a much smaller attack surface.
Keep in mind that no being accessible from the internet does not mean it is safe as your local network is ALSO a very hostile environment with modern technologies (especially your PCs, smartphones , smart TV, and so on). Make sure you use HTTPS, proper authentication and so on to protect your server