Your Office Printer Is the Attacker’s Doorway: IoT Security Risks

Every smart device in your business — from the IP camera in the lobby to the smart lock on the server room and the multifunction printer in the breakroom — is a potential entry point for cybercriminals. In 2026, the threat landscape has shifted dramatically. Attackers no longer need to guess your CEO’s password to breach your network. They simply need to find the one forgotten smart thermostat or unpatched printer that was left on the same network as your financial systems.

For small and medium-sized enterprises (SMEs) with 10 to 500 employees, the reliance on Internet of Things (IoT) and Operational Technology (OT) devices for efficiency is undeniable. But convenience has a price: expanded attack surfaces. If your business is plugged into the internet, attackers are already knocking on your digital front door — and they are using your IoT devices to get in.

What's Happening Right Now (current threat landscape, trending in 2025–206)

In 2025 and early 2026, threat intelligence reports from CISA and the FBI IC3 highlight a massive escalation in IoT-targeted attacks. The Mirai-style botnets that once focused on distributed denial-of-service (DDoS) attacks have evolved. Today, attackers use compromised IoT devices as stepping stones to infiltrate corporate networks, exfiltrate data, and deploy ransomware.

The "Verkada playbook" — a strategy made infamous in 2024 where attackers exploited default credentials on IP cameras to gain network access — is still the most common initial access vector mapped to MITRE ATT&CK techniques. However, we are now seeing attackers pivot from smart HVAC systems and networked printers to deploy IoT-specific ransomware, which can brick devices and halt physical operations, not just digital ones. The CISA alerts of 2025 warned that unmanaged IoT devices are now the #1 cause of initial breaches for SMEs lacking dedicated security teams.

How This Attack Works (step-by-step, written for non-technical readers)

You don’t need to be a hacker to understand how this happens. Think of your network like a house. Your firewalls and email servers are the front door and windows. Your IoT devices are the unlocked cellar door. Here is how the attack unfolds:

1. 1The Scan: Automated bots constantly scan the internet for devices with default passwords (like admin/admin) or known, unpatched vulnerabilities in older firmware.
2. 2The Sneak In: An attacker finds your lobby IP camera or office printer. Because it wasn’t updated or configured securely, they log in using default credentials. This is the "beachhead."
3. 3The Pivot: Once inside the camera’s system, the attacker looks around. Because the camera is on the same network as your computers, they use it to jump laterally into your main network. They can now see your HR databases, accounting files, and customer records.
4. 4The Payoff: The attacker installs ransomware or steals sensitive data. In some 2025 cases, attackers shut down the HVAC system of a warehouse to create physical chaos while negotiating a ransom.

Real-World Examples

The most famous example remains the 2024 Verkada breach. Attackers exploited default credentials on Verkada IP cameras installed at hundreds of businesses. Because those cameras were connected to the same network as corporate computers, attackers pivoted from the video feeds into internal systems, stealing confidential data.

More recently, in early 2026, a mid-sized regional manufacturing firm suffered a catastrophic ransomware attack. The initial breach wasn't through an employee clicking a phishing link — it was through a networked industrial printer. Attackers used an unpatched vulnerability in the printer’s firmware to access the network, deploying ransomware that encrypted both digital files and locked the factory’s OT production lines, resulting in a three-day operational shutdown.

Who Is Most at Risk

Businesses with 10–500 employees are the primary targets. These organizations often buy smart devices directly from retail outlets or distributors without a dedicated IT security team to vet them. If you fall into these categories, you are highly vulnerable:

• Manufacturing and Warehousing: Heavy reliance on OT (Operational Technology) like smart thermostats, conveyor belt controllers, and networked printers.
• Healthcare: Connected medical devices and IP cameras in patient areas that are often left on legacy, unpatched software for "stability."
• Retail and Hospitality: Smart locks, digital signage, and point-of-sale IoT peripherals that blend in with personal devices.

If your IoT devices share the same Wi-Fi network as your employee laptops, you are operating with a severe lack of defense-in-depth.

Warning Signs to Watch For

Because IoT devices rarely have screens, employees and managers must look for indirect signs of compromise. Watch for:

• Phantom Logins: IP cameras or smart locks showing "recording" or "locked" when no one is using them.
• Unexplained Network Traffic: Your internet suddenly slowing down during the day, which could indicate a Mirai-style botnet using your devices for DDoS attacks.
• Device Erratic Behavior: Printers jamming repeatedly, smart thermostats changing settings on their own, or security cameras losing connection randomly.
• Unfamiliar Devices: Seeing an unknown device appear on your network inventory or Wi-Fi router admin page.

How to Protect Your Business

Securing your IoT environment doesn't require a million-dollar budget; it requires discipline and alignment with frameworks like the NIST Cybersecurity Framework (CSF) and CIS Controls.

1. 1Conduct an IoT Inventory: You cannot secure what you do not know exists. Use network discovery tools to catalog every smart device in your office. Document the device type, manufacturer, firmware version, and physical location.
2. 2Implement Network Segmentation: This is the single most effective defense. Do not let your smart HVAC system or lobby camera talk to your accounting software. Place IoT devices on a separate Virtual Local Area Network (VLAN). If a camera is compromised, the attacker hits a digital dead end, not your corporate network.
3. 3Enforce Firmware Update Policies: Manufacturers regularly release patches for IoT vulnerabilities. Assign an IT owner to check for and apply firmware updates quarterly, or configure devices to auto-update if possible.
4. 4Replace Default Credentials with Phishing-Resistant MFA: Never leave a factory password. Change default credentials to complex, unique passwords. Wherever the device supports it, enable phishing-resistant Multi-Factor Authentication (MFA) using passkeys or hardware security keys (like YubiKeys), rather than SMS codes.

Quick Action Checklist

• [ ] Isolate IoT Devices: Immediately move all IP cameras, smart locks, and printers to a separate guest or IoT Wi-Fi network that cannot access internal corporate files.
• [ ] Change Default Passwords: Audit all networked devices today. If a device still uses its default password (check the label on the bottom), change it immediately.
• [ ] Disable Unused Features: Turn off remote access, UPnP, and cloud connectivity on devices that only need to operate on your local network.
• [ ] Update Firmware: Log into your printer and router admin panels and check for pending security patches.
• [ ] Review NIST CSF: Ensure your incident response plan includes IoT compromise scenarios.

Start Here This Week

Today, log into your network router or firewall. Look at the list of connected devices. Do you see cameras, printers, or smart thermostats? If they are on the same network as your employees' computers, you are one compromised device away from a ransomware attack. This week, create a separate IoT VLAN or guest network and migrate those devices to it. It takes 30 minutes and is the most impactful security move you can make right now.