NUUO NVRMini2 version 3.9.1 is vulnerable to authenticated remote command injection. An attacker can send crafted requests to upgrade_handle.php to execute OS commands as root.
https://www.tenable.com/security/research/tra-2018-41
https://www.exploit-db.com/exploits/45948/
https://github.com/tenable/poc/tree/master/nuuo/nvrmini2/cve_2018_15716