Connected devices now sit inside hospitals, factories, retail stores, utilities, and smart buildings across the world. Every one of these devices adds convenience, but it also adds a new entry point for attackers. Understanding what risk is posed by Internet of Things devices starts with recognizing a simple fact; IoT hardware rarely gets the same security attention as traditional laptops and servers. Analysts at Transform Insights expect global IoT connections to approach 40 billion by the early 2030s, spanning healthcare, manufacturing, transportation, utilities, retail, and smart building systems. NIST and CISA have both published guidance warning that this growth is expanding the enterprise attack surface faster than most security teams can monitor it. Knowing how attackers exploit these devices is the first step toward reducing IoT security risks across an organization.
What Risk Is Posed by Internet of Things Devices?
Internet of Things devices face risks of unauthorized access, data breaches, botnet recruitment, and network compromise, largely because many ship with weak default security controls. A single unmonitored camera or sensor can give an attacker a position inside an essentially well-defended network.
IoT devices commonly expose organizations to several different threats. Attackers use them to gain unauthorized access, hijack devices, and breach data, exposing sensitive information. They also utilize compromised devices to distribute malware, build botnets, and move further into a network. Physical security equipment, like cameras and access control panels, brings an added layer of risk because a breach there affects both cyber and physical safety.
Security teams increasingly find that compromised IoT devices act as the opening move in a larger attack chain. An attacker rarely stops at one camera or sensor. Once inside, they look for a path toward identity systems, business applications, or operational technology. CISA and NIST both stress that IoT devices deserve the same evaluation as any other networked asset.
Unauthorized Access and Device Hijacking
Attackers may use the compromised device to attack other systems on the network or to gain unauthorized access to IoT devices and take control, monitor activity, or steal sensitive information. One compromised device can serve as the opening gap of a much larger cyberattack.
The 2021 Verkada camera breach shows this risk clearly. Attackers used a single set of exposed credentials to access thousands of internet-connected security cameras across hospitals, schools, and corporate offices. CISA and OWASP both list weak authentication as one of the most common entry points in IoT attacks today.
Data Breaches and Privacy Risks
IoT devices collect large volumes of sensitive information, including video, audio, biometric data, location history, and operational communications. A breach involving any of this data creates privacy exposure, intellectual property theft, and regulatory compliance problems.
Organizations that lose customer trust after a data breach struggle to rebuild it. ENISA and NIST both recommend treating IoT data collection with the same privacy safeguards applied to traditional IT systems, since the underlying risk to individuals is the same.
Botnet Attacks and Network Exploitation
Attackers frequently infect vulnerable IoT devices with malware, then use command-and-control infrastructure to coordinate large-scale attacks. Infected devices can launch distributed denial-of-service (DDoS) attacks or run automated credential attacks against other targets.
The Mirai botnet remains the clearest example of this threat. It infected IP cameras and DVRs using default credentials, then used the resulting botnet to launch the 2016 Dyn DNS attack, which disrupted major websites across the United States. OWASP and CISA both cite Mirai as a lasting reminder of why default passwords remain dangerous. These attacks succeed largely because many IoT devices share the same set of technical weaknesses.
Common IoT Device Vulnerabilities That Increase Cybersecurity Risks
Most vulnerabilities in IoT devices are the result of a few recurring design and maintenance flaws, not clever tricks by attackers. Being aware of these vulnerabilities can help security teams identify where to begin their IoT device vulnerability evaluations.
Weak Passwords and Poor Authentication
Factory default credentials are the biggest source of IoT security risk. Credential attacks are easily scalable because of password reuse on devices, bad authentication techniques, and a lack of multi-factor authentication (MFA). Shared admin accounts, where no single person is responsible for access, present another risk. OWASP and CISA both recommend unique credentials and MFA as baseline controls on any connected devices.
Outdated Firmware and Software Vulnerabilities
Some manufacturers have ceased support for older models, and many IoT devices run for years without a firmware update. If the fixes are not applied, attackers will exploit known vulnerabilities for years after they are made public. Unlike traditional IT systems, IoT hardware is more difficult to update and might require manual intervention or physical access to the hardware. NIST and CISA do not recommend leaving unsupported devices at risk permanently.
Insecure Communication and APIs
Data in transit between devices and the cloud is at risk from poor encryption, unencrypted network traffic, and poorly protected APIs. Even with known vulnerabilities, open interfaces and old protocols (like Telnet and FTP) are still widely used by legacy IoT devices. ENISA and OWASP also state insecure communication as a major cause of IoT data exposure. These weaknesses can spread to more than one device. They spread into business operations and, in some industries, critical infrastructure.
How IoT Security Risks Impact Organizations and Critical Systems
When an IoT device is compromised, attackers generally use it as a foundation to access more valuable systems and data in the organization. The impact of a connected device being taken offline or hacked impacts operations on manufacturing lines, healthcare equipment, utility controls, and smart building systems. Close behind is financial impact, including downtime, recovery costs, regulatory fines, and broader business interruption while systems get restored.
Enterprise network compromise often follows a predictable path:
- Compromised IoT device
- Internal network
- Identity systems
- Critical business applications
Risks to critical infrastructure extend into energy, transportation, healthcare, and water systems, where a cyberattack can create real physical consequences. This overlap between digital and physical risk is called cyber-physical security.
Shadow IoT poses an additional layer of exposure. Corporate networks are being joined by personal wearables, smart assistants, and BYOD devices that are not managed by the security team, creating blind spots that NIST, ENISA, and CISA all warn about in their guidance. Organizations that leverage proven IoT security practices can avoid all of these risks.
IoT Security Best Practices to Prevent Cyber Threats
Reducing IoT security risk requires layered controls that address identity, patching, and network design together, as no single fix closes every gap on its own.
Use Strong Authentication and Access Controls
Replace default passwords with strong, unique credentials for every device. Enable MFA wherever the device supports it, and apply least privilege access so accounts only reach what they need. Disable unused accounts immediately and centralize identity management where possible. CISA and NIST both list strong authentication as the single highest-impact control available.
Keep Firmware Updated and Monitor Devices
Apply firmware updates and fixes as soon as they are released by the manufacturers. A complete asset inventory is critical, providing security teams with full visibility into devices, because organizations can’t protect devices they don’t know about. Replace unsupported or end-of-life hardware before it becomes a liability.
Implement Network Segmentation and Encryption
Separate IoT devices from core enterprise networks by using VLANs and dedicated IoT networking solutions, and apply Zero Trust principles where possible. Encrypt data in transit with TLS. Turn off any open ports that are not needed. Protect all the API endpoints from unauthorized calls.
Once a device has been compromised, segmentation limits the reach of the attacker. Both the NIST IoT Cybersecurity Program and CISA’s IoT security guidance offer useful starting points for building this kind of layered defense. Strong IoT security is not a one-off project. It has to be constantly updated as new devices, threats, and standards come out.
Conclusion
Internet of Things devices expand the modern attack surface in ways traditional IT security was never designed to handle. Security needs to extend across the full device lifecycle, from purchase through retirement, rather than stopping at initial setup. Strong authentication, consistent update management, network segmentation, encryption, and ongoing monitoring work together to reduce IoT security risk in any organization. Security teams have a proven base to build on by following recognized guidance from NIST, CISA, and ENISA. As the use of IoT expands across every industry, it has become more important than ever to build long-term cybersecurity.
FAQs
What risk is posed by Internet of Things devices?
They can be hacked, data can be stolen, they can be recruited into a botnet, and they can be used to attack the network. Attackers will often hijack devices with weak default credentials and then use that access to steal data or move deeper into the corporate network.
Why are IoT devices vulnerable to cybersecurity threats?
Weak authentication and exposed management interfaces allow attackers to gain unauthorized access. There are other gaps that attackers with legacy firmware, insecure APIs, and poor authentication can exploit using automated tools.
What are the most common security threats affecting IoT devices?
Common threats include malware infection, ransomware, device hijacking, distributed denial of service (DDoS) attacks, data theft, and unauthorized access because of exposed management interfaces.
How can businesses protect IoT devices from cyber attacks?
These include strong authentication, regular firmware updates, segmentation of IoT devices from core networks, encryption of data in communication, and constant monitoring of device activity for any unusual activity.
Can compromised IoT devices affect an organization’s network security?
Yes. The attackers use compromised IoT devices to move across the network. From there, they can steal data, deploy ransomware, and attack important enterprise systems.
