Connected devices have become part of everyday business operations. Smart sensors monitor facilities, medical devices support patient care, industrial controllers help run production environments, and connected cameras or access systems support physical security. As these systems expand, the enterprise attack surface expands with them.
That is why IoT security matters. An IoT device may look simple from the outside, but it can introduce meaningful security risk if it connects to the corporate network, transmits sensitive information, or relies on weak authentication. Many IoT devices are not built with the same onboard security capabilities commonly found in traditional laptops or servers, which can make device security harder to validate and manage.
For organizations preparing for audits or assessments, IoT security is becoming more relevant to broader cybersecurity, network security, and compliance conversations. The question is no longer only whether connected devices work. Organizations need to understand whether those devices are inventoried, segmented, monitored, and protected against unauthorized access.
What Is IoT Security?
IoT security refers to the controls and processes used to protect internet-connected devices, the networks they communicate through, and the applications that support them. It includes device security, network security, application security, API security, authentication, monitoring, and response processes that reduce exposure across an IoT environment.
Unlike many standard IT assets, IoT devices may have limited processing power, restricted logging, or few built-in endpoint security options. Some devices cannot run traditional security tools. Others may depend on cloud platforms or mobile applications that are controlled by the vendor rather than the organization.
A practical IoT security program usually looks at three layers:
- The device itself: Hardware, firmware, configuration, identity, and update capability.
- The network connection: Segmentation, encryption, monitoring, and access control.
- The supporting applications: Cloud services, APIs, administrative consoles, and data storage.
Strong IoT security work starts with visibility. If an organization cannot identify every IoT device connected to its environment, it cannot fully assess security vulnerabilities or unauthorized access paths.
Top IoT Security Challenges Today
IoT security challenges often begin with inventory. Many organizations have more connected devices than they realize, especially when teams connect cameras, thermostats, wearables, printers, sensors, or facility systems outside normal procurement processes. This “shadow IoT” creates unmanaged entry points and weakens network security.
Default credentials are another common issue. Some devices ship with factory-set usernames and passwords, and those settings may remain unchanged after installation. Weak authentication can allow unauthorized access, especially if the device is reachable from a broader network or exposed through a poorly secured management interface.
Patching also creates challenges. IoT technology often stays in service for years, but vendor firmware support may be inconsistent. A vulnerability that would be quickly patched on a standard workstation may remain open on an IoT device because updates are manual, unsupported, or operationally difficult to apply.
Communication security adds another layer of risk. Data moving between IoT devices, gateways, mobile apps, and cloud services may not always use strong encryption or transport layer security. If traffic is not properly protected, attackers may be able to intercept sensitive information or manipulate command traffic.
Common IoT security issues include:
- Unauthorized access through weak credentials.
- Unpatched firmware or unsupported devices.
- Insecure APIs and cloud management portals.
- Poor network segmentation.
- Limited logging and threat detection.
- Overlooked vendor access and maintenance accounts.
These IoT security threats can create real business impact. A compromised device may be used to pivot deeper into the network, disrupt operations, or expose data that was never meant to leave the environment.
IoT Security and the Compliance Landscape
IoT security is increasingly relevant to audit and compliance expectations because connected devices can affect the security of regulated data and critical systems. Frameworks and regulations may not always use the phrase “IoT security,” but they often require organizations to manage assets, control access, protect data, monitor activity, and respond to security incidents.
The NIST Cybersecurity Framework can help organizations think through IoT-related risk within broader cyber security and risk management programs. It supports activities such as identifying connected assets, protecting systems from unauthorized access, detecting security events, and responding when a security breach occurs.
Healthcare organizations may also need to consider connected medical devices as part of HIPAA and HITECH control environments. If an IoT device supports clinical workflows or interacts with protected health information, device security and network security become part of the broader data protection conversation.
SOC 2 and ISO/IEC 27001 assessments may also surface IoT security questions. Auditors may look for evidence that connected devices are included in the asset inventory, risk assessment, access control processes, and monitoring activities. For organizations with industrial systems, OT security may also overlap with IoT security when operational technology connects to enterprise networks or cloud services.
Emerging regulatory expectations are adding pressure as well. The IoT Cybersecurity Improvement Act created baseline requirements for certain federal IoT devices, while other laws and standards continue to shape how manufacturers and enterprise users approach IoT security standards. For many organizations, the direction is clear: connected devices need defined ownership, documented controls, and evidence that those controls operate in practice.
Best Practices for IoT Security
There is no single IoT security solution that addresses every connected environment. The right security measure depends on the device type, business use, network design, and data involved. Still, several IoT security best practice areas apply broadly.
Maintain a Complete Device Inventory
Organizations should maintain an inventory of every IoT device connected to the environment. The inventory should identify device type, owner, location, network segment, vendor, firmware version, and support status. Automated discovery tools can help identify unmanaged devices that may otherwise remain hidden.
Segment IoT Networks
Network segmentation limits what an IoT device can reach. Instead of placing connected devices on the same network as servers or user workstations, organizations can isolate the IoT network through VLANs, firewall rules, and restricted routing. Segmentation reduces the risk that a compromised device becomes a path into more sensitive systems.
Strengthen Authentication
Strong authentication is essential for securing IoT devices. Default credentials should be replaced, shared accounts should be avoided, and administrative access should be limited to approved users. Where supported, device-to-device authentication, certificates, and privileged access management can further reduce unauthorized access risk.
Encrypt Communications
Data moving between devices and applications should be protected using appropriate encryption and secure communication protocols, including transport layer security (TLS) where supported. This is especially important when devices transmit sensitive information, telemetry, or operational commands.
Monitor for Threat Activity
Threat detection for IoT environments often depends on network-level monitoring because devices may not support traditional agents. Intrusion prevention system capabilities, anomaly detection, and traffic analysis can help identify unusual communication patterns, suspicious outbound connections, or behavior tied to known cyber threats.
Validate Controls Through Testing
Securing IoT devices should include testing, not only documentation. Penetration testing, configuration reviews, and segmentation testing can help validate whether IoT security controls operate as intended. These activities may also support assessment evidence when stakeholders ask how IoT security risks are being managed.
Validating the Security of Your IoT Environment
A mature IoT security program should be able to show how controls work, not just describe them. That means organizations need evidence showing that devices are inventoried, access is restricted, communications are protected, and monitoring is active.
Insight Assurance provides independent assessment services that can evaluate IoT security controls against relevant frameworks and audit expectations. Depending on scope, this may include reviewing asset inventories, access controls, network security boundaries, segmentation evidence, logging, and governance practices related to connected devices.
Insight Assurance also performs security testing services, including penetration testing where applicable, to validate whether controls reduce exposure to unauthorized access or common IoT security threats. Our role is to assess, test, and report on control design and operation. We do not operate devices, implement remediation, or manage the client’s security environment.
Build a Resilient, Connected Future
IoT devices can improve operations, visibility, and automation, but connectivity should be matched with disciplined security. The organizations that manage IoT security well treat connected devices as part of the broader control environment, not as isolated equipment.
As IoT security risks continue to evolve, assessment-ready evidence becomes more important. Organizations should be able to show where devices are located, how they are protected, who can access them, and how security events are detected.
Contact Insight Assurance to discuss IoT security assessment expectations, control validation, and how connected device security can be reviewed through an independent audit lens.
