Print and scan data is often transmitted over networks in unencrypted form. This allows attackers to intercept transmitted documents. Print files that are temporarily stored on print servers can also be read. This applies to central scanning and document processing systems, as well.

Unencrypted communication interfaces for the administration of such devices present further sources of danger. If, for example, printers are accessed via HTTP, SNMPv2, or Telnet, the information involved is not protected when it is transmitted. This endangers device passwords and other access information.