IoT security: 10 must-have controls
Short answer
IoT security plays out on four fronts: device (signed firmware, secure element), network (private APN, mutual TLS), platform (auth, auditing), and operations (lifecycle management, key rotation). Layered architecture removes 90% of the risk before you even touch advanced analytics.
The four recurring mistakes
Shared credentials across devices, unsigned firmware allowing remote flashing, public APN without mutual TLS, and no key rotation plan. Any fleet with two of these is in serious danger.
The 10 minimum controls
Unique identity per device (X.509 certificate in a secure element), client and server mutual TLS, private APN with VPN to your backend, fixed IP for firewalling, OTA key rotation, signed firmware, audit logs, VLAN segmentation, anomaly alerting, and a documented incident plan.
OWASP IoT Top 10 as a checklist
OWASP publishes a yearly list: weak passwords, insecure services, insecure interfaces, lack of updates, insecure components, privacy, data transfer, device management, default configuration, and lack of physical hardening. Walk through each one.
- Unique per-device identity
- Mutual TLS
- Private APN + fixed IP
- Signed, updatable firmware
- Automated key rotation
Free IoT security audit
We review your fleet against the 10 controls and OWASP IoT Top 10. Report with prioritized risks and 90-day remediation plan.
Frequently asked questions
Do I need a secure element in every device?+
Recommended for real-risk projects (health, energy, payments). For low-cost, low-impact sensors, MCU secure storage can work if paired with good flashing practices.
Is a private APN enough?+
No. It shrinks attack surface but doesn't replace mutual TLS, signed firmware, or device auth. They stack.
What do EU regulations (CRA, NIS2) require?+
The Cyber Resilience Act (CRA) forces manufacturers to issue patches over the product lifetime, coordinate vulnerabilities, and meet design requirements. Enforceable from late 2027 with growing pressure.
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