How Hackers Exploit IoT Devices to Gain Network Access

Your smart thermostat. Your security camera. Your voice assistant. Your smart TV. These devices make your life more convenient, but they also introduce significant security risks. In 2026, IoT devices are one of the most common entry points for hackers. Attackers exploit these devices to gain access to networks, steal data, and launch further attacks. Understanding how IoT devices are exploited is essential for protecting your network.

In this article, I will examine how hackers exploit IoT devices to gain network access, the techniques they employ, and how to protect yourself. Our fraud investigation team applies these principles daily to investigate IoT compromises and help victims secure their networks.

The Scale of the Problem

IoT devices are everywhere—and they are notoriously insecure. The numbers are alarming:

• 20+ billion IoT devices are connected to networks worldwide.
• 90% of IoT devices are vulnerable to attack.
• 50% of network breaches start with an IoT device.
• 120,000 new IoT malware variants emerge every month.

Why IoT Devices Are Vulnerable

IoT devices have several characteristics that make them prime targets for hackers:

Default Credentials

Most IoT devices ship with default usernames and passwords that are widely known. Users often never change these credentials, making it trivial for hackers to gain access. Common default credentials include:

• admin/admin
• admin/password
• root/root
• user/user
• admin/1234

Infrequent Updates

IoT devices rarely receive regular security updates. Manufacturers often stop supporting devices shortly after release. Vulnerabilities remain unpatched for years, providing attackers with reliable entry points.

Limited Processing Power

IoT devices lack the processing power for advanced security measures. They cannot run comprehensive antivirus software or intrusion detection systems. This makes them easy targets for malware.

Network Exposure

Many IoT devices are exposed directly to the internet. They use protocols like UPnP and port forwarding, making them discoverable and accessible to attackers. Scanning services like Shodan make it easy for hackers to find vulnerable devices.

Lack of Encryption

Many IoT devices transmit data without encryption. This allows attackers to intercept communications, steal data, and even inject malicious code. Unencrypted communication is a major vulnerability.

How Attackers Exploit IoT Devices

Attackers employ systematic techniques to identify and compromise IoT devices.

Reconnaissance

Attackers find IoT devices through:

• Shodan – A search engine for internet-connected devices that makes it easy to find vulnerable IoT devices.
• Mass scanning – Scanning IP ranges for open IoT ports (22, 23, 80, 443, 554, 8080, 8443).
• Default credential testing – Trying default credentials on discovered devices.
• Vulnerability scanning – Scanning for known vulnerabilities in IoT firmware.

Compromise

Attackers compromise IoT devices through:

• Default credentials – Logging in with default usernames and passwords.
• Vulnerability exploitation – Exploiting known vulnerabilities in the firmware.
• Brute force – Guessing weak passwords through brute force attacks.
• Man-in-the-middle – Intercepting communication to inject malicious code.

Establishing Persistence

Once compromised, attackers maintain access through:

• Installing backdoors – Creating hidden access points.
• Creating new user accounts – Adding accounts for future access.
• Using command and control (C2) – Connecting to C2 servers for commands.
• Joining botnets – Adding the device to a botnet for attacks.

Lateral Movement

From the compromised IoT device, attackers move to other parts of the network:

• Network scanning – Scanning the internal network for other devices.
• Credential theft – Stealing credentials from the device.
• Exploiting trust – Using the device's trusted position to access other systems.
• Privilege escalation – Gaining higher-level access through other vulnerabilities.

Common IoT Attack Vectors

Attackers use several common attack vectors to exploit IoT devices. Understanding these vectors is essential for protection.

Botnet Recruitment

Compromised IoT devices are often added to botnets like Mirai. These botnets are used to launch devastating DDoS attacks. Mirai has been responsible for some of the largest DDoS attacks in history, including the 2016 Dyn attack that disrupted major internet services. The source code was released publicly, leading to countless variants.

Network Pivoting

IoT devices are often positioned on the same network as critical systems. Attackers use them as a foothold to move laterally to other devices. For example, a compromised smart TV can be used to access a connected corporate network. This is a common technique for gaining access to sensitive systems.

Data Exfiltration

IoT devices can be used to steal data:

• Cameras and microphones capture audio and video.
• Smart home devices reveal patterns of occupancy.
• Sensitive data can be exfiltrated through unencrypted connections.

How to Identify Vulnerable IoT Devices

Identifying vulnerable IoT devices is the first step in securing them. Our free assessment can help you identify vulnerable IoT devices on your network.

Network Scanning

Scan your network to identify all connected devices:

• Use network scanning tools to discover devices.
• Check for devices with open ports and known vulnerabilities.
• Identify devices using default credentials.

Vulnerability Assessment

Assess IoT device vulnerabilities:

• Check for unpatched vulnerabilities – Identify devices with known vulnerabilities.
• Test default credentials – Try default credentials on all IoT devices.
• Review network exposure – Check if devices are exposed directly to the internet.

How to Protect Your Network

Protecting your network from IoT-based attacks requires a combination of technical measures and good security hygiene.

Essential Security Measures

Take these steps to protect yourself:

• Change default credentials – Immediately change the default usernames and passwords on all IoT devices.
• Keep firmware updated – Update IoT device firmware as soon as updates are available.
• Use network segmentation – Place IoT devices on a separate VLAN from critical systems.
• Disable UPnP – Disable Universal Plug and Play on your router to prevent automatic port forwarding.
• Monitor network activity – Watch for suspicious outbound connections from IoT devices.

Advanced Protection Strategies

For individuals at elevated risk, consider these advanced strategies:

• Use a firewall – Block unnecessary inbound and outbound traffic from IoT devices.
• Use a VPN – Use a VPN to access IoT devices remotely instead of exposing them directly.
• Conduct regular security audits – Regularly audit IoT device security.
• Engage professional investigators – If you suspect compromise, seek professional analysis.

How HireCyberz Investigates IoT Compromises

At HireCyberz, our IoT compromise investigation process follows a structured methodology:

• Assessment – We evaluate your network and identify vulnerable IoT devices.
• Analysis – We analyze compromised devices to identify the attacker's entry point.
• Remediation – We support device remediation and network security hardening.
• Protection – We implement measures to prevent future compromises.

Contact us to discuss your IoT security concerns. Our free assessment can help you understand your current security posture. Explore our full range of services for comprehensive IoT protection.

Best Practices for IoT Security

To protect against IoT-based attacks:

• Change default credentials – Change default usernames and passwords on all IoT devices.
• Keep firmware updated – Update IoT device firmware regularly.
• Use network segmentation – Place IoT devices on a separate VLAN.
• Disable UPnP – Disable UPnP on your router.
• Engage professionals – Seek professional support for complex security concerns.

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*This article is for informational purposes only. All investigations are conducted ethically and with appropriate authorization. Consult security professionals for guidance on specific situations.*