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What are the actual security implications of port forwarding? (alien.top)

submitted 10 months ago by Alt_Lightning@alien.top to c/main@selfhosted.forum

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Like, I hear all the time that you shouldn't open any ports on your networks fire wall for security reasons this and security reasons that. But what are the actual security implications/risks of forwarding a port for something like Jellyfin or a Minecraft server or something like that? Explain like im 16 (or something)

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[–] Bulky_Construction51@alien.top 3 points 10 months ago

Also be aware that an exposed port that has an application responding to requests can give information that might reveal weaknesses (for example old versions with available exploits).

I know Minecraft was very exploitable earlier, I guess with that specific version an attacker would still be able to get access to your machine in some cases.

So port forwarding is like unlocking a door. As long as the stuff inside the door knows how to handle unwanted guests then no problem. But the challenge, as others have mentioned, is to make sure you actually know everything is secure.