Stack-based buffer overflow in the base, IPDS DLE, Forms DLE, Barcode DLE, Prescribe DLE, and Printcryption DLE components on certain Lexmark laser printers and multi-function printers allows remote attackers to execute arbitrary code or cause a denial of service (device hang) via a long argument to a PJL INQUIRE command.
http://www.securityfocus.com/archive/1/510251/100/0/threaded
http://support.lexmark.com/index?page=content&id=TE84&locale=EN&userlocale=EN_US