Connected devices have quietly taken over critical infrastructure, from hospital equipment to factory automation systems. The problem is not the technology itself. It is the speed of adoption outpacing any reasonable security response. 

Every sensor, controller, or networked terminal added to an environment introduces new exposure. Most organizations do not notice how fast those risks accumulate until something goes wrong, and by then, the damage is already done.

The Scale of the Problem

Ericsson projects the number of connected devices globally will surpass 29 billion by 2030. Security investment has not kept pace. Many endpoints ship with default credentials, outdated firmware, and no practical path to receiving updates after deployment.

This issue matters because conventional security tooling was built around standard computing environments. It often has no way to detect threats on constrained devices running proprietary systems. A security platform monitoring laptops and servers may never register suspicious activity on a connected pressure sensor or building access terminal.

Filling that gap requires purpose-built assessment. Many organizations are now engaging IoT security testing services to surface weaknesses before they become incidents. These evaluations cover firmware integrity, hardware interfaces, communication protocols, and cloud back-end connections, giving teams a realistic view of where their actual exposure lies.

Why Attack Surfaces Keep Growing

Device Sprawl Outpaces Inventory

Security teams cannot defend what they do not know exists. In many organizations, device procurement happens at the department level without central oversight. A facilities team installs a networked access control system. A logistics group deploys asset trackers. Neither group notifies security.

The result is shadow inventory: a growing collection of devices operating on the corporate network with no security baseline, no monitoring, and no one accountable for them.

Legacy Protocols Create Persistent Gaps

A significant portion of connected devices communicate over protocols that predate modern security expectations. Zigbee, Z-Wave, and older MQTT implementations lack default encryption or authentication. Any attacker with local network access can intercept or manipulate device traffic without sophisticated tools.

Remediation is rarely simple. Hardware constraints limit what firmware changes are possible, and some devices remain in active use long after the manufacturer has stopped supporting them.

Cloud and Mobile Integration Adds Complexity

Connected devices rarely operate in isolation. They sync with cloud platforms and mobile applications, each of which introduces its own potential entry points. A vulnerability in a companion app for a smart lock, for instance, can bypass physical security entirely without ever touching the device directly.

Each integration layer extends the attack path. Breaches do not always start at the device.

Where Security Teams Fall Behind

Insufficient Testing Cadence

Most organizations assess connected devices once during procurement and rarely return to them. That is a problem, because firmware updates, new integrations, and evolving network configurations all change a device’s risk profile over time. A device that cleared a security review two years ago may carry substantially more exposure today.

Lack of Segmentation

Flat network architectures remain common in mid-sized organizations. When all devices share a single segment, a compromised security camera or office printer becomes a pivot point toward more sensitive systems. Proper segmentation limits how far any single breach can travel, but it requires deliberate planning that many teams deprioritize.

Underestimating Physical Attack Vectors

Most security attention focuses on digital pathways, but connected devices are also vulnerable to physical interference. Exposed debug ports, removable storage slots, and unsecured hardware interfaces can allow an attacker with brief physical access to extract firmware or introduce malicious code. Any assessment that skips the hardware layer is working with an incomplete picture.

Conclusion

The gap between device deployment and security coverage does not close on its own. Organizations relying solely on perimeter defenses will eventually find that one unmanaged endpoint is enough to compromise an otherwise sound environment. Addressing the issue requires accurate inventory, consistent assessment, and a clear map of how each device connects to the broader network. 

Security teams that treat connected devices as a distinct discipline, rather than an extension of standard IT, are far better equipped to manage what those devices actually bring with them.