This vulnerability is of great concern as Malware on an internal company computer can attack and infect a printer, the printer then can attack other devices and PCs, completely hidden from the usual virus checkers!

Remotely Exploitable Flaw Found In HP Enterprise Printers—Patch Now.
Wednesday, November 22, 2017 Mohit Kumar

Security researchers have discovered a potentially dangerous vulnerability in the firmware of various Hewlett Packard (HP) enterprise printer models that could be abused by attackers to run arbitrary code on affected printer models remotely.

Read more: https://thehackernews.com/2017/11/hp-printer-hacking.html