An unrestricted file upload vulnerability in importuser.cgi in ASUSTOR AS6202T ADM 3.1.0.RFQ3 allows attackers to upload supplied data to a specified filename. This can be used to place attacker controlled code on the file system that is then executed.
https://www.purehacking.com/blog/matthew-fulton/back-to-the-future-asustor-web-exploitation