The HTTP interface of the Grandstream UCM6200 series is vulnerable to an unauthenticated remote SQL injection via crafted HTTP request. An attacker can use this vulnerability to execute shell commands as root on versions before 1.0.19.20 or inject HTML in password recovery emails in versions before 1.0.20.17.
https://www.tenable.com/security/research/tra-2020-15
http://packetstormsecurity.com/files/156876/UCM6202-1.0.18.13-Remote-Command-Injection.html