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. ThisXFINITY WiFi service is completely separate from your secure WiFi home network.
Not only is this done without your knowledge, it's done without your explicit permission. This will cause your WiFi bandwidth to suffer if someone is using your connection. Bad Comcast! Bad!