The FTP print feature in multiple Canon printers, including imageRUNNER and imagePRESS, allow remote attackers to use the server as an inadvertent proxy via a modified PORT command, aka FTP bounce.
The print-from-email feature in the Canon ImageRUNNER (iR) 5000i and C3200 digital printer, when not using IP address range filtering, allows remote attackers to print arbitrary text without authentication via a text/plain email to TCP port 25.