Discover why smart home devices are vulnerable to cyber threats and learn how IoT security can protect your home network and personal data.
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You have WiFi light bulbs, a smart thermostat, a robot vacuum, a doorbell with a camera, plugged-in plugs, and maybe a voice assistant. Each of those devices is a small computer with an internet connection, and most were designed prioritizing functionality and price, not security. A 2024 Palo Alto Networks report revealed that 57% of IoT devices have known vulnerabilities that manufacturers never patched. After setting up more than 30 smart devices in my home and having experienced an attempted unauthorized access to an IP camera, I take IoT security very seriously.
The bottom line: Cheap IoT devices are the weakest link in your home network. An attacker who compromises your $8 WiFi bulb can pivot to your main network and gain access to your PC or NAS. Basic measures—changing default passwords, updating firmware, creating a separate WiFi network for IoT, and disabling features you don’t use—block most attacks.
Why IoT is insecure
IoT manufacturers operate with minuscule margins. An $8 WiFi bulb doesn’t have the budget for security equipment, code audits, or regular firmware updates. The processor is minimal (ESP8266 or similar), the RAM is scarce (64-128 KB), and the operating system is an RTOS (Real-Time Operating System) without the protections of a modern Linux or Windows.
The result: default passwords that are never changed (“admin/admin” is universal), unencrypted device-to-cloud communications (your data travels in plain text), unnecessary open ports, firmware with known unpatched vulnerabilities, and poorly secured manufacturer cloud APIs.
The most famous attack on IoT was the Mirai botnet (2016), which infected more than 600,000 IP cameras and routers with default passwords and used them to launch the largest DDoS attack in history (against Dyn, leaving Twitter, Netflix, Reddit, and Spotify without service). Mirai variants are still active in 2026.
Separate network: the most effective measure
Creating a separate WiFi network for IoT devices is the security action with the greatest impact. If an attacker compromises your WiFi bulb, they only access the network of light bulbs, plugs, and vacuum cleaners, not your PC with bank documents or your NAS with family photos.
Most modern routers support guest networks (which isolate devices) or VLANs (more advanced network segmentation). The simplest setup: create a guest network (Router Settings > Guest Network) and connect all IoT devices there. Connect your “trusted” devices (PC, mobile, NAS) to the main network. Our step-by-step guide to protecting your router with the 8 must-have settings explains how.
For those who want more control, Home Assistant with VLAN and firewall allows you to create rules that prevent IoT devices from communicating with each other or with the internet except for specific functions. Our guide to getting started with smart home and smart home from scratch covers setup.
The 7 IoT Security Rules
1. ALWAYS change the default password. First of all, when setting up any device. If your device doesn’t allow you to change your password, don’t buy it.
2. Update the firmware. Check for monthly updates. If your device hasn’t received an update in more than a year, consider replacing it with one from a manufacturer that maintains updates.
3. Turn off features you don’t use. If your camera has remote access and you don’t need it, turn it off. Each active function is an additional attack surface. The UPnP (Universal Plug and Play) protocol is especially dangerous: it automatically opens ports on your router without your knowledge. Turn it off on your router.
4. Buy brands with a safety record. Tuya, Philips Hue, Aqara, Ring, TP-Link Kasa, Google Nest, and Apple HomeKit are manufacturers that release regular updates. Generic unnamed brands from AliExpress may work but don’t expect security patches.
5. Use local protocols when possible. Zigbee, Z-Wave, and Thread/Matter work locally without relying on the manufacturer’s cloud. If the manufacturer shuts down or their servers are hacked, your devices continue to work.
6. Monitor network traffic. Tools like Pi-hole or your router’s dashboard show which devices are communicating and which servers they are communicating with. If your WiFi bulb is sending data to an unknown IP at 3 AM, there’s a problem.
7. Audit periodically. Every 3 months, review the list of devices connected to your network, remove any you don’t use (disconnect or factory reset), and check for any pending updates.
Matter and Thread: a safer future
The Matter standard (launched in 2022, adopted by Apple, Google, Amazon, and Samsung) seeks to solve IoT security and interoperability issues. Matter requires AES-128 encryption for all communications, security certification for each device, and works on top of Thread (a local mesh protocol that doesn’t need WiFi or the cloud).
In 2026, Matter adoption is growing: more than 2,000 certified devices. Our guide on Matter, Thread, and smart home compatibility explains the practical implications.
My rating
IoT security is the great black hole of home cybersecurity. We spent time and money on antivirus, passwords, and VPNs but left 15 IoT devices with default passwords and 2022 firmware connected to the same network as our work PC. The good news: the protection measures are simple and free. The separate network takes 10 minutes to set up. Change passwords, another 20. And deactivate UPnP in 2 minutes. That half-hour effort closes the door on most attacks. Standards like Matter are promising, but until adoption is universal, the responsibility for IoT security remains with the user.
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Frequently Asked Questions
Can a hacker turn on my camera without me knowing?
If the camera has unpatched vulnerabilities and is exposed to the internet (open port, active UPnP, default password), yes. Documented cases of unauthorized access to Wyze, Ring, and Eufy cameras have made headlines in recent years. The measures to prevent it are a strong password, updated firmware, two-factor authentication if the camera supports it, and disabling remote access if you don’t need it.
Are Apple HomeKit devices safer?
Yes, HomeKit has the strictest security requirements on the market: mandatory end-to-end encryption, local processing whenever possible, and MFi certification that includes security auditing. The limitation is the price (HomeKit devices typically cost 20-40% more than generic equivalents) and the smaller catalog. If security is a priority, HomeKit or Matter are the most robust options.
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