Data Security in Printers: Why Rented Devices Need Proper Configuration

In the digital age, printers are no longer passive machines that simply output pages. Modern printers—especially multifunction devices (print/scan/copy/fax)—are networked endpoints that store, transmit, and process data. Overlooking their security exposes organizations to significant risks. This is particularly true when devices are rented (or leased) rather than owned outright, since configuration or sanitation might be assumed as someone else’s responsibility. If you are considering renting printers from a provider like Docmix, which offers printer rentals and related services, you must ensure that these devices are properly secured before they enter your environment. 

Why Printers Are a Security Risk 

Printers Are Networked Devices with Data Storage 

Modern printers often contain internal hard drives, cache memories, and storage buffers. Print jobs, scanned documents, logs, and firmware revisions may all leave residual data on these storage elements. Without encryption or proper wiping, that data can be recovered by unauthorized actors. 

Default Credentials and Unsecured Services 

Many printers ship with default admin usernames and passwords (e.g. “admin/admin”). If not changed, these credentials become an open door for attackers to reconfigure, intercept, or hijack the device. In addition, printers may run unnecessary services such as Telnet, FTP, or HTTP by default. Attackers could exploit these to access stored data or upload malicious firmware. 

Print Job Interception 

When print data is sent over the network in the clear—via protocols like LPR, RAW, or HTTP—it can be intercepted and read. Only encrypted protocols such as IPPS or secure print release options protect the confidentiality of print jobs in transit. 

Lateral Threats and IoT Risks 

A compromised printer can serve as a foothold for attackers to move laterally into the wider network. Once inside, they may escalate privileges, install malware, or exfiltrate sensitive data. As printers increasingly act like IoT endpoints, they inherit many of the same vulnerabilities, including weak segmentation and poor default security. 

Residual Data & Decommissioning Risks 

At the end of lease, if a printer is returned or replaced without securely wiping its internal storage, residual sensitive information can remain. Attackers or subsequent users may recover it. 

Studies and real-world cases have shown that thousands of printers with internet connectivity are vulnerable and can be hijacked. Security research has also demonstrated attack methods, such as “Printjack,” that exploit weaknesses in printer systems—even when organizations assume their devices are safe. 

The Added Challenge of Rented / Leased Devices 

When renting or leasing printers, additional risks emerge: 

1. Ambiguous Responsibility 

The lease agreement may not clearly define who is responsible for firmware updates, configuration hardening, or data erasure. If both sides assume the other handles it, gaps occur. 

2. Preconfigured Defaults 

Devices delivered by the rental provider may still carry default settings (passwords, open ports, sample configurations) unless explicitly overridden. 

3. Weak Security by Provider 

The rental company might prioritize ease-of-use or quick deployment over rigorous security. Unless they follow strict policies, vulnerabilities can be baked into the device before delivery. 

4. Return & Transition Risks 

As devices are swapped or returned periodically, failure to wipe stored data becomes a recurring liability. Past data may persist if not properly sanitized. 

5. Variation Among Units 

In a fleet of rented machines, units may differ in model, firmware level, or features — leading to inconsistent security controls across the environment. 

Because of these challenges, organizations using rented printers must insist on rigorous configuration, oversight, and contractual guarantees. 

Best Practices for Secure Configuration of Rented Printers 

To mitigate risks, here are best practices you should insist on (either by yourself or through your managed print services provider): 

1. Change Default Credentials Immediately 

On first setup, replace all default admin/user passwords with strong, unique passwords. Disable any unused accounts or remote access. 

2. Disable Unnecessary Services & Ports 

Turn off Telnet, FTP, HTTP (non-TLS), SNMP v1/v2, or other legacy protocols unless explicitly needed. Use access control lists (ACLs) to restrict which IPs can reach the printer. 

3. Enforce Encryption for Data in Transit and at Rest 

Enable TLS/HTTPS or IPPS for print jobs. Encrypt internal storage (where supported). Configure secure print release (e.g., user authentication or PIN-based release) to prevent documents sitting uncollected. 

4. Segment the Printer Network 

Place printers on a separate VLAN or subnet with strict firewall rules. Prevent them from freely reaching internal systems. Only allow the minimal required access. 

5. Regular Firmware Updates & Patch Management 

Treat printers like servers: schedule regular firmware checks and updates to patch known vulnerabilities. If the rental provider cannot guarantee that, require them to do so. 

6. Centralized Logging and Monitoring 

Enable audit logs for access, configuration changes, user prints, and errors. Monitor anomalies or unusual activity. Send logs to a secure monitoring system. 

7. Secure Decommissioning 

Before returning a rented device, mandate a certified data wipe or physical destruction of storage as applicable. Keep records of the sanitization process. 

8. Include Security Requirements in the Contract 

Your rental or lease agreement should explicitly state the security measures and responsibilities (e.g., “provider will deliver devices with updated firmware, enforce default credential change, guarantee secure erasure on return”). 

9. Train Users 

Teach employees to use secure print, avoid sending sensitive documents carelessly, and report anomalies. Users are part of the chain of defense. 

Putting It All Together: What to Ask Your Printer Rental Provider 

When evaluating a printer rental service such as Docmix or others, ask: 

- Do they supply devices preconfigured with strong security settings? 

- Who is responsible for firmware and patch updates — the provider or your IT team? 

- What is their data-erasure or destruction protocol when returning a device? 

- Are they willing to sign a service-level agreement (SLA) around security? 

- Do they support encrypted print protocols, secure print release, and network segregation? 

- Do they provide logging, monitoring, and audit capabilities? 

- Can they support independent audits of their devices? 

If the provider is unable or unwilling to meet your security standards, you should reconsider or negotiate for stricter terms. The cost of a data breach—reputational damage, regulatory fines, and remediation—far outweighs the extra diligence up front. 

Conclusion 

Printers are no longer innocuous peripherals; they are networked devices with storage, processing, and connectivity capabilities. Left unsecured, they can become weak points or even launchpads for large-scale breaches. The risks become even more pronounced when you rent or lease devices, because responsibility for security can get blurred between you and the provider. 

By demanding secure configuration—changing passwords, disabling unnecessary services, enforcing encryption, segmenting networks, logging usage, updating firmware, and sanitizing devices on return—you can mitigate most of the major threat vectors. And by embedding these demands into your contract with providers like Docmix, you ensure that security is not an afterthought but a core part of the service.