ESC/POS, a printer control language designed by Seiko Epson Corporation, lacks mechanisms for user authentication and command authorization, does not provide controls to restrict sources or destinations of network communication, and transmits commands without encryption or integrity protection.

Stack-based buffer overflow vulnerability exists in SEIKO EPSON Web Config. Specially crafted data input by a logged-in user may execute arbitrary code. As for the details of the affected products and versions, see the information provided by the vendor under [References].

Multiple SEIKO EPSON printer drivers for Windows OS are configured with an improper access permission settings when installed or used in a language other than English. If a user is directed to place a crafted DLL file in a location of an attacker's choosing, the attacker may execute arbitrary code with SYSTEM privilege on a Windows system on which the printer driver is installed.