My router's firewall was set to accept incoming traffic for about 48 hours. Misconfiguration from a user, apparently.
I have few devices on the network (two Windows PC, Freenas, printer, chromecast TV). The firewall logs were disabled. No default login/password on any device, except for one (guest Windows account without password).
What is the potential damage? How do I assess it? I don't know where to start.