Citizen Printer Default Password

Once upon a time in the "paperless" office of a mid-sized logistics firm, there sat a Citizen CL-S700 industrial printer named

Hardware Exceptions: Some mobile thermal printers (like the CMP-40) use a button sequence instead of a text password to enter the setup screen: Up, Enter, Up, Enter, Up. Common Model Default Credentials Model Series Default Username Default Password CT-S Series (Receipt) admin admin Used for CT-S601II, CT-S4500, etc. CL-E Series (Label) admin admin Includes CL-E321, CL-E331, CL-E300 CL-S Series (Label) admin admin Includes CL-S700, CL-S521, CL-S621 CMP Mobile Series Button Sequence ↑up arrow →right arrow →right arrow ↑up arrow →right arrow →right arrow ↑up arrow Security Recommendation citizen printer default password

Real-World Incident: How a Default Citizen Password Led to a Breach

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. Once upon a time in the "paperless" office

If the default admin/admin does not work, it is likely the password was changed by a previous administrator. You can perform a Factory Reset to restore these defaults by holding the Feed button while powering the printer on, though this will also wipe existing network settings. Attackers scanned for port 80 and discovered a

The Importance of Securing Citizen Printers: A Look at Default Passwords