A new study by security researchers at NCC Group has found “vulnerabilities and exploitations relating to devices made by six of the largest enterprise printer makers in the world.” More specifically, the researchers discovered that serious flaws present in Xerox, HP, Lexmark, Kyocera, Brother, and Ricoh printers could be exploited by threat actors to gain a foothold on company networks.

The discovered vulnerabilities were disclosed to the manufactures, who have released security patches. The researchers will present their findings at DEF CON on Saturday.

Read more: Warning As Dangerous Cybersecurity Risks Found In Mainstream Office Printers: Report