It is possible to execute arbitrary commands as root in Terramaster F4-210, F2-210 TOS 4.2.X (4.2.15-2107141517) by sending a specifically crafted input to /tos/index.php?app/del.
https://www.cisa.gov/news-events/cybersecurity-advisories/aa24-207a
https://thatsn0tmy.site/posts/2021/12/how-to-summon-rces/
http://packetstormsecurity.com/files/172881/TerraMaster-TOS-4.2.15-Remote-Code-Execution.html