HP Refutes Claim That Printer Flaw Could Be Exploited to Cause Fire

Hewlett-Packard acknowledges that there is a vulnerability in some of
its LaserJet printers, but says that the claim made by those who
disclosed the flaw that it could be exploited to set the machines on
fire is untrue. A hardware component of HP printers called the thermal
breaker would prevent the overheating the researchers said could start
the fire. The researchers claim that the flaw could also be exploited
to steal documents and take control of networks. The essence of the
problem lies in the fact that the vulnerable printers do not validate
the origin of remote firmware updates.

http://www.scmagazineus.com/hp-says-security-flaw-is-real-but-flames-are-unlikely/article/217911/

http://redtape.msnbc.msn.com/_news/2011/11/29/9076395-exclusive-millions-of-printers-open-to-devastating-hack-attack-researchers-say

http://www.theregister.co.uk/2011/11/30/hp_probes_fire_started_printer_vuln/