Certain older Lexmark devices (C, M, X, and 6500e before 2018-12-18) contain a directory traversal vulnerability in the embedded web server.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2018-10604
http://support.lexmark.com/index?page=content&id=TE906&locale=EN&userlocale=EN_US