cgi_system in NUUO's NVRMini2 3.8.0 and below allows remote attackers to execute arbitrary code via crafted HTTP requests.
https://www.tenable.com/security/research/tra-2018-25
https://www.nuuo.com/backend/CKEdit/upload/files/NUUO_NVRsolo_v3_9_1_Release%20note.pdf