Further, they claimed they could easily have installed Trojan malware to spy on documents being printed.

But the real issue is with the firmware update process.

Context contacted Canon in March 2014 and provided the supplier with information about this issue.

Canon Prima Printer hacked by security researchers from Context

The printer manufacturer responded by saying it would provide a fix as quickly as possible.

Canon Prima Printer hacked by security researchers from Context

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source: www.techworm.net