The global number of IoT devices has exceeded 30 billion. IoT device security varies greatly, becoming the primary springboard for attackers to infiltrate enterprise networks. This article analyzes the 2026 IoT security threat landscape.

Major Threat Types

Default credential attacks: Many IoT devices still use factory default passwords. Firmware vulnerabilities: Unupdated old firmware, existing known vulnerabilities are exploited. Insecure communication: Sensitive data transmitted through unencrypted MQTT, CoAP protocols. Supply chain attacks: Devices with pre-installed malicious firmware entering the market.

Typical Attack Cases

Mirai botnet variants are still active. In 2026, the largest single DDoS attack peak exceeded 2Tbps. BACnet protocol attacks targeting smart buildings are increasing. Medical IoT devices have become a new target for ransomware.

Response Strategies

Network segmentation: Isolate IoT devices to independent VLANs. Continuous monitoring: Deploy IoT-specific traffic analysis tools. Firmware management: Establish firmware update management processes.

Conclusion

IoT security must start from the procurement stage, incorporating security requirements into supplier evaluation standards.