If PostScript is the printer driver, the printer is vulnerable to what they call Cross-Site Printing attacks, documented in detail at Hacking Printers here.

The bugs range from attackers exfiltrating copies of what’s sent to printers, to denial-of-service, code execution, forced resets and even bricking the targets.

The work from the University Alliance Ruhr landed on Full Disclosure here (with five vendor-specific follow-ups), and as they note: “This vulnerability has presumably been present in every PostScript printer [for] 32 years as solely legitimate PostScript language constructs are abused.”

Source: We don’t want to alarm you, but PostScript makes your printer an attack vector • The Register