How Do I Secure IoT Devices on My Network?

To secure IoT devices on your network, start with the basics: change default credentials, update firmware, place devices on a separate network or VLAN, disable unnecessary features, and limit what they can access internally and on the internet. The safest approach is to treat smart devices as untrusted by default so a compromised camera, printer, thermostat, or sensor cannot easily reach critical systems.

Why IoT Devices Need Special Attention

IoT devices include cameras, printers, smart TVs, thermostats, sensors, voice assistants, badge readers, conference room gear, and other connected appliances. They are useful, but many were not designed with strong security in mind. Some ship with weak default settings, inconsistent patching, poor logging, and unnecessary cloud exposure.

That makes them attractive targets for:

• botnets
• credential abuse
• lateral movement inside a network
• spying through microphones or cameras
• attacks against poorly secured vendor portals

The safest mindset is simple: IoT devices are often higher-risk endpoints, so they should get the minimum access required to function.

1. Inventory Every IoT Device

You cannot secure devices you do not know about. Start by identifying:

• device type and model
• physical location
• owner or business function
• IP and MAC address
• management interface
• firmware version
• internet dependencies

This matters because forgotten devices often become long-term blind spots. A retired camera, old printer, or smart TV in a conference room can remain connected for years without maintenance.

If your environment is growing, document these assets in the same way you would track laptops, servers, and networking gear.

2. Change Default Usernames and Passwords

Default credentials are still one of the most common IoT security failures. Many attacks succeed because devices were deployed quickly and never hardened.

For each device:

• change the default admin password immediately
• use a long, unique password
• disable default accounts if possible
• avoid reusing passwords across devices

A password manager can help teams keep device credentials unique and organized. For example, 1Password can be useful for storing and sharing administrative credentials safely within a household or small team.

If the platform supports MFA for management access, enable it. If not, restrict who can reach the admin interface.

3. Segment IoT From Core Systems

This is one of the highest-value controls. IoT devices should not sit on the same flat network as laptops, servers, backups, or directory services.

Use:

• a separate SSID for smart devices
• a dedicated VLAN or subnet
• firewall rules between IoT and the rest of the network
• allowlists for only the traffic the devices actually need

For example, a smart thermostat may need internet access to a vendor cloud service, but it probably does not need access to finance systems, file shares, or employee workstations.

Segmentation limits lateral movement if a device is compromised.

For a broader primer, see what is network segmentation and why does it matter.

4. Update Firmware and Software Regularly

Many IoT products have known security issues that are only fixed through firmware updates. Establish a patching routine:

• check for firmware updates at deployment
• enable automatic updates if they are reliable and appropriate
• subscribe to vendor security notices when available
• replace devices that no longer receive updates

If a vendor has effectively abandoned a device, treat it as a growing risk. Unsupported IoT should be isolated tightly or retired.

Firmware management is often less mature than normal endpoint patching, which is exactly why it needs a defined process.

5. Disable Unnecessary Services and Features

Most devices ship with more functionality than you need. Every enabled protocol or feature increases attack surface.

Review and disable what is not required, such as:

• remote administration from the internet
• UPnP
• Bluetooth if unused
• Telnet or insecure web management
• unused APIs or integrations
• default cloud sharing features

If the device only needs local operation, do not expose it externally.

6. Restrict Inbound and Outbound Access

Security teams often focus on inbound exposure, but outbound traffic matters too. A compromised IoT device may call out to attacker infrastructure, download malware, or scan internal systems.

Use firewall or gateway policies to:

• block unnecessary outbound destinations
• limit DNS to approved resolvers
• deny administrative access from untrusted networks
• permit only required ports and protocols

The goal is simple: each device should communicate only with the systems it truly needs.

If you manage devices remotely from outside your home or office, use secure remote access rather than exposing device interfaces directly to the internet. In some small-team or consumer scenarios, a VPN such as NordVPN or Surfshark may help protect traffic in transit, but it should complement segmentation and access control, not replace them.

7. Secure Management Interfaces

Web consoles, mobile apps, and vendor cloud portals are often overlooked. If attackers compromise the management plane, they may not need to attack the device directly.

Protect management access by:

• limiting admin access to specific IPs or management networks
• requiring strong credentials
• disabling remote admin unless absolutely necessary
• reviewing account permissions
• removing former employee access promptly

For business environments, avoid managing critical IoT from shared or personal accounts where possible.

8. Monitor Device Behavior

Even basic monitoring helps. Watch for:

• new IoT devices joining the network
• unusual outbound traffic
• repeated login failures
• connections to unexpected countries or domains
• scans or traffic toward internal systems

Many IoT compromises are noticed only after a device starts behaving strangely, consuming bandwidth, or interacting with systems it should never touch.

For small businesses, this can be as simple as reviewing firewall logs and DHCP leases regularly. For larger environments, you may want alerts for unauthorized devices or unusual network behavior.

9. Plan for Replacement, Not Just Deployment

IoT security is a lifecycle issue. Before buying or deploying devices, ask:

• does the vendor provide updates?
• how long is the support window?
• can the device be centrally managed?
• does it allow password changes and secure protocols?
• can it function safely if internet access is restricted?

Cheap devices with poor maintenance often cost more in risk than they save in purchase price.

Unsupported hardware is especially risky because known vulnerabilities may remain unpatched indefinitely. For more on that issue, see what is the risk of unsupported hardware.

Common Misconceptions

My IoT device is harmless, so nobody would target it

Attackers often do not care what the device does. They care that it is connected, poorly secured, and useful for botnets, spying, or pivoting deeper into the network.

If it is inside my network, it is already protected

Internal placement is not enough. A vulnerable device on a flat network can still be exploited and used for lateral movement.

I changed the Wi-Fi password, so the device is secure

That helps with wireless access, but it does not fix default admin credentials, outdated firmware, exposed services, or weak network design.

Only internet-facing IoT devices are risky

Not true. Devices with no direct public exposure can still be compromised through local access, weak credentials, vendor apps, or previously infected systems on the same network.

Consumer-grade smart devices are fine for business use

Sometimes they work operationally, but they often lack enterprise-grade management, logging, update support, and access controls.

Final Takeaway

The practical rule is straightforward: treat IoT devices as untrusted, limit what they can reach, and keep them maintained. If one smart device gets compromised, good segmentation and access controls should keep it from becoming a broader security incident.

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