"Your XFINITY Wireless Gateway broadcasts an additional ?xfinitywifi?
network signal for use with XFINITY WiFi. This creates an extension of the XFINITY WiFi network right in your home that any XFINITY Internet subscriber can use to sign in and connect. This XFINITY WiFi service is completely separate from your secure WiFi home network."
Do you believe that last sentence???
Does giving access to the network with the SSID "xfinitywifi" put one's private network at risk?