When uploading a firmware image to a Netgear Nighthawk Wifi6 Router (RAX30), a hidden “forceFWUpdate” parameter may be provided to force the upgrade to complete and bypass certain validation checks. End users can use this to upload modified, unofficial, and potentially malicious firmware to the device.
Any request send to a Netgear Nighthawk Wifi6 Router (RAX30)'s web service containing a “Content-Type” of “multipartboundary=” will result in the request body being written to “/tmp/mulipartFile” on the device itself. A sufficiently large file will cause device resources to be exhausted, resulting in the device becoming unusable until it is rebooted.