The update process of the Circle Parental Control Service on various NETGEAR routers allows remote attackers to achieve remote code execution as root via a MitM attack. While the parental controls themselves are not enabled by default on the routers, the Circle update daemon, circled, is enabled by default. This daemon connects to Circle and NETGEAR to obtain version information and updates to the circled daemon and its filtering database. However, database updates from NETGEAR are unsigned and downloaded via cleartext HTTP. As such, an attacker with the ability to perform a MitM attack on the device can respond to circled update requests with a crafted, compressed database file, the extraction of which gives the attacker the ability to overwrite executable files with attacker-controlled code. This affects R6400v2 22.214.171.124, R6700 126.96.36.199, R6700v3 188.8.131.52, R6900 184.108.40.206, R6900P 220.127.116.11, R7000 18.104.22.168, R7000P 22.214.171.124, R7850 126.96.36.199, R7900 188.8.131.52, R8000 184.108.40.206, and RS400 220.127.116.11.