This is a real exploit chain in cups-browsed. The tl;dr is that it will add basically anything that knows the correct protocol to your printers, and this can be exploited for RCE if you print to the malicious printer. The service listens on all interfaces by default on UDP 631.

It is not as horrible as it was marketed, but it’s real. You may or may not have this service running by default; I didn’t on Fedora.