A low privileged remote attacker can upload arbitrary data masked as a png file to the affected device using the webserver API because only the file extension is verified.
Exploitability
AV:NAC:LPR:LUI:NScope
S:UImpact
C:NI:LA:N4.3/CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:NOther