IoT is everywhere, quietly powering everything from smart thermostats in homes to complex systems in industrial networks. While these devices bring incredible convenience and innovation, they also open the door to significant cybersecurity risks, especially in manufacturing and similarly sensitive sectors.
The longer devices stay online, the more likely they are to become vulnerable due to outdated software, misconfigurations, or a lack of ongoing security management. If you haven’t already taken a hard look at your IoT setup, now is the perfect time to ask: Is it time for an IoT audit?
Why IoT Audits Matter
IoT security isn’t a one-and-done exercise; it’s an ongoing process that demands vigilance. Many organizations deploy IoT devices and then forget about them, assuming they’ll just keep working securely in the background. But these devices—no matter how small or seemingly innocuous—can become a major security liability if left unchecked.
In this case, we don’t have to look further than legacy systems. Think about the industrial sensors that have been running in a factory for years, or the security cameras that were installed back when IoT was just gaining traction. These devices might still function perfectly, but they could be running outdated firmware with known vulnerabilities, or they might lack even basic encryption standards. Attackers know this, and they’re always on the lookout for easy entry points.
Conducting an IoT audit is about identifying these weak links before they’re exploited. An audit helps you take stock of what’s connected, assess how well those devices are protected, and prioritize remediation. Ultimately, this is about protecting your entire digital ecosystem, because one insecure device can compromise an entire network.
Building an Inventory: Know What You Own
The first step in any IoT audit is understanding what’s actually connected to your network. It’s surprisingly easy to lose track of devices, especially in large organizations with hundreds or even thousands of endpoints. A comprehensive inventory is the foundation for all other security measures.
Start by mapping every device that connects to your network. That means everything from smart door locks to environmental sensors. Use automated discovery tools where possible, but don’t rely on them exclusively; manual verifications and cross-referencing asset lists are necessary to capture the full picture.
Once you have a complete list, categorize devices based on their criticality and function. Devices controlling industrial processes, for example, should receive more immediate attention than a smart lightbulb in the break room. Don’t just record what the device is, also capture details like firmware version, software dependencies, and whether it can be updated or replaced easily. This level of detail helps you make informed decisions later when prioritizing patches or upgrades.
Evaluating Network Segmentation: Divide and Conquer
An often overlooked but crucial element of IoT security is proper network segmentation. Not every device needs to be on the same network as your core business operations. By segmenting devices into separate VLANs or network zones, you can drastically reduce the risk of a single compromised device serving as an attack vector for attacks on more critical systems.
Start by identifying which devices truly need to interact with each other and which ones don’t. Likewise, devices like a video surveillance system or industrial controller system should have restricted communication paths, isolated from the main business network to limit lateral movement opportunities for attackers
Effective segmentation also means controlling external access. IoT devices should never be directly exposed to the internet unless absolutely necessary, and even then, they should be protected with VPNs, multi-factor authentication, and tight firewall policies. This layered approach can make it significantly harder for attackers to move laterally within your network.
Firmware and Software Updates: Patch Early, Patch Often
With your inventory in place, the next priority is making sure all devices are up to date. It’s astonishing how many devices run on outdated firmware, leaving them exposed to known exploits that attackers can easily find in public vulnerability databases.
Thus, you must check the firmware version of each device against the manufacturer’s website or known vulnerability listings. Pay close attention to devices that haven’t been updated in a while. These are prime targets for attackers. If possible, automate the process of checking and updating devices; many modern IoT management platforms can handle this for you. But even with automation, manual oversight is essential. Sometimes updates fail, or new firmware introduces unexpected problems, and those issues can’t be ignored.
Equally, it’s important to consider cloud security when managing devices that rely on cloud-based dashboards or management platforms. Ensure that these cloud services follow strong security protocols, as a compromise in the cloud could affect all your connected devices
At the same time, sadly, updating isn’t always straightforward. Some older devices might not support newer firmware, or the vendor may no longer provide updates. In those cases, consider segmenting the device from the rest of the network or replacing it with a more secure alternative. The key is to treat patch management as a non-negotiable part of your IoT strategy, rather than a nice-to-have feature.
Authentication and Access Control: Who’s In Charge?
A common oversight in IoT security is weak authentication. Too many devices still ship with default usernames and passwords, and too many organizations neglect changing them. Attackers thrive on default credentials because they’re so easy to guess or find online, giving any cybercriminal a potential entry point against careless companies.
Strong authentication should be standard for every device. This means unique passwords (preferably stored in a secure password manager) and multifactor authentication wherever possible. For devices that support certificate-based authentication, make sure certificates are managed properly and rotated regularly.
Access control is just as important. Who has access to each device, and do they need that access? Implement the principle of least privilege, ensuring users only have the permissions they actually need. Review and update access rights regularly, and don’t forget about remote access; VPNs or secure tunnels are much safer than open ports that anyone on the internet can poke at.
Conclusion
IoT devices bring incredible capabilities to every industry, but they also bring risks that can’t be ignored. An IoT audit helps you shine a light on the dark corners of your network, revealing hidden vulnerabilities that could otherwise lead to devastating attacks.
It’s not about checking a box for compliance; it’s about taking ownership of your digital infrastructure and making sure it’s as secure as possible. Don’t wait for an incident to force your hand. Now is the time to ask yourself: Is it time for an IoT audit?
About the Author
Editor’s Note: The opinions expressed in this guest author article are solely those of the contributor and do not necessarily reflect those of Fortra.
