D-Link DIR-846 devices with firmware 100A35 allow remote attackers to execute arbitrary code as root via HNAP1/control/SetGuestWLanSettings.php.
https://www.dlink.com/en/security-bulletin/
https://github.com/dahua966/Routers-vuls/blob/master/DIR-846/GuestWLanSetting_RCE.md