Citizen Printer Default Password (TOP-RATED • 2026)

Advanced users should be aware that some Citizen printers (particularly older CL-series barcode printers) have a hidden service mode accessible via Telnet (port 23) or serial console. The default credentials for this service mode are often hardcoded and cannot be changed by the user. For the CL-Series, the service-level default password is frequently service or a blank password with username sysadm.

This is a significant vulnerability. If you have a Citizen printer that exposes Telnet, you should:

You cannot use the default password if you cannot find the login screen. Here is the standard workflow for accessing a Citizen network printer. citizen printer default password

If you are prompted for a password immediately upon connecting, the device has been configured previously.

In the modern office, the humble printer is often the most overlooked piece of networked equipment. We spend hours securing routers, servers, and workstations, yet the device sitting in the corner—the one that holds every sensitive document sent to it—frequently remains protected by a factory default password. For users of Citizen Systems printers (widely used in retail, healthcare, and hospitality for receipt, label, and barcode printing), understanding the Citizen printer default password is not just a technical footnote; it is a critical component of network security. Advanced users should be aware that some Citizen

While administrator / administrator works for 90% of modern network-enabled Citizen printers, some legacy models (pre-2010) or specific regional firmware versions use a blank password.

Some high-end Citizen label printers store credentials in NVRAM. You must send an escape command sequence via serial or USB. Connect using a terminal program (PuTTY, RealTerm) and send:
! U1 E2 24 23 5B 00 00 00 (this clears the admin password). Request the full command list from Citizen support. If you are prompted for a password immediately

In early 2023, a regional pharmacy chain in the Midwest experienced a data leak. Attackers scanned for port 80 and discovered a Citizen CT-S4000 receipt printer used for prescription labels. The printer was still using admin / admin. The attackers changed the SMTP server settings to forward every printed receipt—including patient names, drug names, and doctor NPI numbers—to an external email address. The breach went undetected for three months because the pharmacy staff never accessed the printer’s web interface. The fine: $450,000 under HIPAA.

This is the most common series in retail. The web interface (WebConfig) uses: