The Internet of Things increases risk because every connected device becomes another potential entry point that must be secured, monitored, and patched. A single weak device can give an attacker initial access, especially when devices are unmanaged or lightly defended. Security teams need to treat connected devices as part of the core environment, not as peripheral assets with lower protection requirements.
Why IoT expands the organisation’s attack surface
IoT expands attack surface because it turns many small, often overlooked devices into part of the organisation’s trusted environment. Those devices usually add their own firmware, management interfaces, credentials, update paths, and network communications, which means each one can be abused directly or used as a foothold into more valuable systems.
The risk is not just volume, it is diversity. IoT deployments mix cameras, sensors, building systems, wearables, industrial controllers, and smart peripherals, each with different security expectations and patching realities. That variety makes standard hardening, inventory, and monitoring harder to enforce consistently.
Why unmanaged devices create easier entry points
IoT devices often live outside normal endpoint governance, so they may miss the controls that are routine for laptops and servers. When a device is lightly monitored, has default or weak credentials, or cannot be patched quickly, it becomes a practical entry point for initial compromise.
Because many devices are always on and permanently connected, attackers do not need a rare timing window. They can probe exposed services, abuse management protocols, or exploit known weaknesses long after the device has been installed.
Why one weak device can increase exposure across the whole environment
A compromised IoT device is valuable to attackers because it can provide persistence, internal network access, or a path to adjacent systems. Once inside, they may move laterally, harvest credentials, or use the device as a relay point into networks that were not meant to be directly reachable.
This is why IoT is not only a device problem. It is an environment problem. Connected devices can create new trust relationships, new data flows, and new dependencies that expand the number of places where security failure can matter.
Risk and Threat Considerations
IoT risk grows when organisations treat connected devices as low-value “things” rather than as managed assets that can expose sensitive data or provide internal access. The main danger is that a single weak device can be exploited at scale, especially where device identity, patching, and network segmentation are inconsistent.
Failure mechanism: attackers exploit exposed management interfaces, weak authentication, outdated firmware, or vendor defaults to compromise a device, then use that device as an internal foothold or persistence point.
Impact: the organisation may face broader lateral movement, loss of visibility, service disruption, and compromise of systems that were never directly internet-facing.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
CIS Controls v8, NIST CSF 2.0 and NIST SP 800-53 Rev 5 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-1 — Inventory and Control of Enterprise Assets | IoT expands attack surface by adding assets that must be discovered and managed. |
| Recommendation — Maintain a complete device inventory and remove unauthorized or unmanaged IoT assets. | ||
| NIST CSF 2.0 | ID.AM-01 — Physical devices and systems within the organization are inventoried | IoT risk starts with knowing what devices exist and where they are connected. |
| PR.AA-05 — Identities and credentials are issued, managed, verified, revoked, and audited | IoT devices rely on credentials and management access that can widen exposure if poorly governed. | |
| Recommendation — Inventory all connected devices and keep ownership and location current. Govern device credentials with unique issuance, rotation, revocation, and audit. | ||
| NIST SP 800-53 Rev 5 | CM-8 — System Component Inventory | IoT devices are system components that must be tracked to reduce hidden exposure. |
| IA-5 — Authenticator Management | Device access often depends on secrets or authenticators that are high-value attack targets. | |
| Recommendation — Keep an accurate component inventory and reconcile it against active device connections. Apply secure authenticator lifecycle controls and rotate device secrets regularly. | ||
Practitioner Guidance
What to prioritise: start with device inventory, ownership, and exposure. If you cannot identify every connected device and its business owner, you cannot meaningfully secure the attack surface it creates.
What to verify: confirm that devices have unique credentials, current firmware, and a supported update path. Also verify whether each device is allowed to talk only to the systems it truly needs, rather than to broad internal networks.
What good looks like: connected devices are on a known register, monitored like other assets, segmented from high-value systems, and removed quickly when they are no longer supported or cannot be patched safely.
Practitioner takeaway: IoT increases attack surface most sharply when scale and convenience outrun governance, so the real control objective is to reduce blind spots and shrink what each device can reach if it fails.
Related resources from NHI Mgmt Group
- Why does an expanding attack surface increase operational and financial risk for organisations?
- Why does weak external attack surface visibility increase remediation risk for internet-exposed assets?
- Why does a constantly changing attack surface increase breach risk for internet-facing systems?
- Why does slow attack surface assessment increase breach risk for internet exposed assets?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 28, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
