Forgotten Printers, Open Doors: Why Unaudited Devices Are Your Office's Greatest Cybersecurity Liability

Ask the average US office manager how many printers are currently connected to their network. More often than not, the answer involves a pause, a rough estimate, and a qualifier: somewhere around five or six, I think. That uncertainty is not a minor administrative gap. It is a security vulnerability with measurable consequences.

Networked printers are computing devices. They run embedded operating systems, store document data in onboard memory, maintain open communication ports, and in many cases hold administrative credentials that have never once been changed from their factory defaults. Yet they are routinely excluded from IT security protocols, asset management systems, and routine maintenance schedules. The result is a growing population of forgotten devices sitting quietly on corporate networks — invisible to IT teams and completely visible to anyone who knows where to look.

What Cybercriminals Actually See When They Look at Your Network

When a malicious actor probes a corporate network, they are not necessarily looking for the most sophisticated target. They are looking for the path of least resistance. Unmanaged printers offer exactly that.

In documented cases across the United States, attackers have exploited printer vulnerabilities to gain initial network access, intercept documents queued for printing, extract cached credentials stored in device memory, and pivot laterally to more sensitive systems. A 2022 analysis by cybersecurity firm Quocirca found that 68 percent of US organizations had experienced at least one print-related data breach in the prior twelve months. More troubling still, a significant portion of those incidents originated from devices that were not included in the company's official IT asset registry.

The attack surface is broader than most business owners realize. Modern multifunction printers often include web-based administrative interfaces accessible via standard browsers. If those interfaces are left open on default credentials — which is common on devices that have never been formally onboarded — an attacker with basic tools can access print logs, scan stored documents, alter device configurations, or use the printer as a relay point to other systems on the same network segment.

The Inventory Problem Nobody Talks About

Before any security hardening can take place, a business must first know what it owns. This sounds obvious. In practice, it is rarely accomplished.

Organizations accumulate printers over years of growth, departmental purchases, and equipment transitions. A printer bought for a satellite office three years ago may still be connected to the main network. A device replaced during a lease upgrade may never have been formally decommissioned. A personal printer brought in by an employee and connected to the office Wi-Fi may not appear on any official record at all.

Each of these scenarios represents an unmonitored endpoint. And unmaintained devices are particularly dangerous not just because of their configuration weaknesses, but because they rarely receive firmware updates. Printer manufacturers regularly issue firmware patches to address discovered vulnerabilities. A device that has not been serviced or updated in two or three years may be running firmware with publicly documented exploits — exploits that attackers can find with a simple internet search.

Conducting a Security-Focused Printer Inventory

A security-oriented printer audit differs meaningfully from a routine cost audit. Where a cost audit asks how much are we spending on these devices, a security audit asks what are these devices capable of doing to us. The following steps provide a practical framework.

Step one: Network discovery before physical counting. Do not begin with a walk through the office. Begin with a network scan. Tools such as Nmap, or enterprise-grade solutions like SolarWinds Network Performance Monitor, can identify every device currently communicating on your network. Cross-reference that list against your official asset registry. Any device that appears on the network but not in your records requires immediate investigation.

Step two: Document every device's administrative configuration. For each printer identified, record the device make, model, firmware version, assigned IP address, and administrative credentials currently in use. Flag any device still operating on default manufacturer credentials. These must be changed immediately and documented in a secure credential management system.

Step three: Audit stored data and print logs. Many networked printers store recent print jobs in onboard memory. Some retain this data indefinitely unless manually cleared. Review each device's storage settings and, where appropriate, enable automatic memory clearing after each job. For devices handling sensitive documents — legal filings, financial records, health information — this step is not optional.

Step four: Check firmware currency. Visit the manufacturer's support page for each identified device and compare the currently installed firmware version against the latest available release. Any device running outdated firmware should be updated immediately or, if it is no longer supported by the manufacturer, flagged for decommissioning.

Step five: Establish network segmentation for print devices. Where possible, printers should be placed on a dedicated network segment or VLAN, isolated from systems containing sensitive business data. This limits the lateral movement an attacker can achieve even if a printer is successfully compromised.

Step six: Formally decommission abandoned devices. Any printer that is no longer in active use should be removed from the network, have its storage wiped, and be formally logged as decommissioned. A device sitting powered off in a storage closet but still connected to a network port is not harmless — it is an unmonitored endpoint.

Why Maintenance History Matters for Security

There is a direct relationship between regular maintenance and security posture. A printer that is serviced on a consistent schedule is a printer whose firmware gets reviewed, whose configuration gets checked, and whose anomalies get noticed. A device that has not been touched in eighteen months is, by definition, a device whose vulnerabilities have been accumulating undetected.

This is one reason that professional maintenance programs — whether delivered locally or through remote support providers — offer value that extends well beyond mechanical upkeep. A technician who examines a device regularly is also a technician who notices when something has changed: an unfamiliar open port, an administrative account that should not exist, a print log showing traffic at unusual hours.

For US businesses operating with lean IT teams, this kind of structured oversight is difficult to maintain internally across an entire device fleet. Engaging a dedicated printer service provider that incorporates security checks into routine maintenance visits is one practical way to close that gap without dramatically expanding internal headcount.

The Cost of Inaction

Data breaches are expensive. IBM's 2023 Cost of a Data Breach Report placed the average total cost of a breach in the United States at $9.48 million — the highest of any country in the study. Not every breach originates from a printer. But when one does, the contributing factor is almost always the same: a device that nobody was watching.

The printer audit nobody wants to do is, in most cases, the audit that would have prevented a breach that nobody wanted to explain. The administrative effort required to inventory, configure, and maintain a fleet of networked printers is modest compared to the regulatory, reputational, and financial consequences of a preventable security incident.

The devices your office has forgotten are not neutral. They are active participants in your network's security posture — for better or worse. The only question is whether you choose to manage that participation deliberately, or leave it to chance.