IIUC it doesn't have any listening sockets open on WAN by default at least?
I do see sockets listening on all interfaces, but those are blocked by the firewall.
root@OpenWrt2:~# ss -Qlnt4 'src 0.0.0.0' State Local Address:Port Peer Address:Port LISTEN 0.0.0.0:443 0.0.0.0:* LISTEN 0.0.0.0:80 0.0.0.0:* LISTEN 0.0.0.0:22 0.0.0.0:*
I do see sockets listening on all interfaces, but those are blocked by the firewall.