The Comcast firmware on Motorola MX011ANM (firmware version MX011AN_2.9p6s1_PROD_sey) and Xfinity XR11-20 Voice Remote devices allows local users to upload arbitrary firmware images to an XR11 by leveraging root access. In other words, there is no protection mechanism involving digital signatures for the firmware.

Comcast XFINITY WiFi Home Hotspot devices allow remote attackers to spoof the identities of Comcast customers via a forged MAC address.

Comcast XFINITY Home Security System does not properly maintain base-station communication, which allows physically proximate attackers to defeat sensor functionality by interfering with ZigBee 2.4 GHz transmissions.

The XFINITY Constant Guard Mobile (aka com.whitesky.mobile.android) application 3.1.140603 for Android does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.