After this report was announced, HP released a statement stating that no systems had been reported compromised by this potential attack. Moreover, the company claimed that this would not impact any printers produced after 2009.
Now HP released a firmware update for the owners of older LaserJet printers, which should fix the security exploit. The company says that it is actively working with its customers to make sure that the updates get installed.
"No customer has reported unauthorized access to HP. HP reiterates its recommendation to follow best practices for securing devices by placing printers behind a firewall and, where possible, disabling remote firmware upload on exposed printers," HP said.
The firmware update can be found at www.hp.com/support and selecting Drivers.