No, I don't know of any vulnerabilities in Calibre at all, but it's just common safety to me. All my ports and closed and showing as stealth unless I need to forward them for some specific reason. Once that reason is done with, I undo it so they go back to stealth. I'd just rather err on the side of caution, and it seems to be working since over 20 years on the net I've never had one virus or hacking or lost data.
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