They seem to be ESP32 based wifi modems talking to 8-bit machines over a variety of interfaces. I don't think exploits compromising the 8-bit machines are a serious concern or even likely. Presumably the question was just being playful curious.

The IoT-style modems, maybe, but that wasn't what was asked. I'm not sure what the architecture is like for the network so I can't really say if there are security concerns there.