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.

  • even without the firewall, how would something from the internet reach local devices w/o port forwarding or an explicit DMZ? Seems a stretch to worry about low-value targets being momentarily "exposed".
    – dandavis
    Commented Feb 9, 2021 at 20:58
  • What kind of router is this? Do you even have public reachable addresses inside the LAN (i.e. no NAT). Where there any port forwardings or exposed systems setup? See also Vulnerabilities of pure NAT without firewall. Commented Feb 9, 2021 at 21:07
  • @dandavis I worried too much about the incoming traffic that I forgot about the port forwarding. Thanks for pointing that out.
    – Rocket
    Commented Feb 9, 2021 at 21:09
  • @SteffenUllrich Edge Router. No public reachable address. Few very specific port forwarding rules. Nothing too broad. I was worried about potential remote access.
    – Rocket
    Commented Feb 9, 2021 at 21:19
  • In this case the potential impact likely only depends on the specific port forwarding rules since the rest is implicitly protected by NAT. Commented Feb 9, 2021 at 21:56


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