"Ever wondered what the USB-A port on the back of your Wi-Fi router is for? Several things, depending on the model. For example, the port on the router can be used for basic file sharing across your network, charging small devices, and as a waypoint for backing up your computer to an external drive. But here's the truth: I don't recommend using it. Having a USB port on the router sounds convenient, but there are a few problems."
"The fact is that USB ports on routers aren't secure. Many of them operate on outdated protocols, creating vulnerabilities that can be exploited by bad actors. This doesn't mean the entire router is compromised, but the USB port can be a weak link. Using it is not a risk worth taking, especially when safer alternatives are available. Let's break down the biggest reasons you should avoid using the USB port on your router and what to do instead."
Router USB-A ports offer conveniences like basic file sharing, device charging, and serving as backup waypoints to external drives. Many router USB implementations rely on outdated, unencrypted protocols such as FTP, which can transmit credentials and data in plain text and expose them to attackers. A compromised USB service can act as a weak link without implying full router takeover, but the risk to networked sensitive data remains significant. Safer centralized-storage options exist, including dedicated NAS devices or secure cloud services. Avoid connecting external drives to routers unless firmware uses modern encryption and receives regular security updates.
Read at ZDNET
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