VisualDoor
SonicWall SSL-VPN Exploit, as used by Phineas Fisher to hack Cayman Trust Bank and Hacking Team.
Unauthenticated, gives you a "nobody" shell. Getting root is an exercise for the user.
For details see: https://darrenmartyn.ie/2021/01/24/visualdoor-sonicwall-ssl-vpn-exploit/