A few years ago, a family in the US noticed something strange. Their baby monitor — a perfectly ordinary Wi-Fi connected camera — had started moving on its own. The lens was panning around the room while their child slept. Nobody in the house was controlling it.
A hacker had gotten in through their home network, found the camera’s default password had never been changed, and was watching through it remotely.
It’s an unsettling story, but not an unusual one. IoT attacks on home devices happen every day — and most of them succeed not because hackers are particularly clever, but because the devices were never properly secured in the first place.
The good news is that protecting your IoT devices from hackers is entirely within your control, doesn’t require technical expertise, and can be done in an afternoon. This guide walks you through exactly how.
Why Hackers Target IoT Devices
How to Protect IoT Devices from Hackers?
Before getting into the fixes, it helps to understand why smart home devices are such attractive targets.
Your laptop and phone are protected by operating systems that receive regular security updates, antivirus software, and years of hardening by companies that take security seriously. Your smart thermostat, security camera, or Wi-Fi light bulb? Usually none of that.
Most IoT devices ship with bare-bones software, minimal security features, and the same default username and password across every unit ever manufactured. That last point is the key one — when a hacker discovers that a particular model of smart camera uses “admin/admin” as its default login, they can write an automated script that scans the internet for that device and tries those credentials on every one it finds. Within minutes, they can gain access to thousands of homes.
Once inside a single device on your network, an attacker can use it as a foothold to reach other devices, monitor your traffic, steal credentials, or recruit your devices into a botnet — a network of hijacked gadgets used to launch large-scale attacks on other targets without you ever knowing.
None of this requires a sophisticated hacker. These attacks are largely automated, cheap to run, and astonishingly effective against unprotected devices.
Step 1: Change Every Default Password — No Exceptions
This is the single most important thing you can do to protect your IoT devices from hackers, and it takes about five minutes per device.
Every smart device you own — camera, thermostat, smart speaker, router, doorbell, smart plug — shipped with a default password. Some devices use a generic default like “admin” or “password123.” Others use the device’s serial number, which is often printed on the label. Either way, these defaults are publicly known and the first thing any attacker will try.
What to do:
- Access each device through its companion app or web interface
- Navigate to Settings → Security or Account → Change Password
- Set a strong, unique password for each device — at least 12 characters, mixing upper and lowercase letters, numbers, and a symbol
- Don’t reuse the same password across multiple devices
- Store them in a password manager like Bitwarden (free) or 1Password so you don’t need to remember them all
Yes, this is tedious if you have ten smart devices. Do it anyway. This step alone closes the door on the vast majority of automated IoT attacks.
Step 2: Secure Your Router First — It Protects Everything Else
Your router is the gateway between your home network and the internet. Every IoT device in your house connects through it. If your router is compromised, every device connected to it is at risk regardless of how well you’ve secured them individually.
Router security checklist:
- Change the default admin credentials. Your router has a separate login for its admin panel — usually something like “admin/admin” by default. Change both the username and password to something strong.
- Update the firmware. Log into your router’s admin panel and check for firmware updates. Many routers now support automatic updates — enable this if available.
- Enable WPA3 encryption. In your router’s wireless settings, set the security protocol to WPA3 if supported, or WPA2 at minimum. Avoid WEP — it’s outdated and easily cracked.
- Change your network name (SSID). Default network names often reveal your router’s make and model, which helps attackers look up known vulnerabilities. Use a name that reveals nothing — and definitely not your address or surname.
- Disable WPS. Wi-Fi Protected Setup sounds helpful but has a known vulnerability. Disable it in your router settings.
- Disable UPnP. Universal Plug and Play automatically opens ports in your firewall to let devices communicate. This convenience comes at a security cost — disable it unless you have a specific reason to use it.
Step 3: Create a Separate Network for Your IoT Devices
This is the most powerful security step most people skip — and it genuinely changes the risk profile of your entire home network.
The idea is simple: put all your smart home devices on a separate Wi-Fi network, isolated from the devices that hold your sensitive information — your laptop, phone, and tablet. Most modern routers support a guest network, which is a secondary Wi-Fi network that keeps devices on it from communicating with your main network.
Here’s why this matters so much. Imagine a hacker compromises your smart fridge through an unpatched vulnerability. If everything is on one network, that compromised fridge can potentially reach your laptop, your cloud backups, your banking apps. If the fridge is on an isolated IoT network, the hacker is stuck there — they can’t reach anything that matters.
Setting up a guest network takes about five minutes in your router’s settings. Look for “Guest Network” or “Secondary Network” in the admin panel. Give it a strong, unique password — different from your main network — and connect all your smart home devices to it.
Step 4: Keep Firmware and Software Updated
Software updates exist for one primary reason: security. When researchers or manufacturers discover a vulnerability in a device’s firmware, they release a patch. If you don’t install it, that vulnerability stays open indefinitely.
Most smart home devices update through their companion app. Go through each app regularly and check for available updates. Better yet, enable automatic updates wherever the option exists.
Also check the device itself — some cameras, routers, and smart hubs have separate firmware update processes through a web interface or admin panel that the app won’t notify you about.
One important caveat: devices that have been discontinued and no longer receive security updates are a genuine risk. When a manufacturer announces end-of-life for a product — meaning no more patches — that device becomes increasingly vulnerable over time. If you’re running smart home devices that stopped receiving updates years ago, consider replacing them. An unpatched camera watching your front door is a liability, not a security asset.
Step 5: Enable Two-Factor Authentication Wherever Possible
Two-factor authentication (2FA) adds a second layer of verification when you log into a device’s app or account. Even if a hacker obtains your password through a data breach, they still can’t access your account without the second factor — usually a code sent to your phone or generated by an authenticator app.
Most major smart home platforms support 2FA: Amazon Alexa, Google Home, Ring, Nest, Wyze, and others. Go into the account settings of each app and enable it if the option exists.
It adds about ten seconds to your login process and dramatically raises the bar for anyone trying to break into your accounts remotely.
Step 6: Turn Off Features You Don’t Use
Every active feature on a smart device is a potential attack surface. Many devices ship with a long list of capabilities enabled by default — remote access, Bluetooth, voice activation, cloud sync — whether you use them or not.
Go through your devices and ask honestly: do I use this feature? If not, disable it.
Some specific things to look at:
Remote access: If you only control your devices from home on your own Wi-Fi, turn off remote access. Remote access requires opening a communication channel to the outside internet — that channel is one more thing to potentially exploit.
Microphones and cameras: Some smart TVs, displays, and home hubs have microphones or cameras that are enabled even when you’re not actively using them. Disable these in settings if you don’t use them.
Bluetooth: Devices that have Bluetooth enabled but that you never connect to via Bluetooth are broadcasting unnecessarily. Switch it off.
Cloud storage on security cameras: Many cameras offer optional local storage via SD card. If you use local storage and don’t need cloud recording, disabling cloud sync reduces the data you’re entrusting to a third-party server.
Step 7: Monitor What’s Connected to Your Network
You can’t protect devices you don’t know exist on your network. Smart devices accumulate over time — old ones get forgotten, new ones get added — and it’s easy to lose track of what’s actually connected.
Every few months, log into your router’s admin panel and look at the list of connected devices. Most routers show you the device name, manufacturer, and IP address of everything on the network. Ask yourself: do I recognise all of these? Is anything there that shouldn’t be?
For a more user-friendly view, apps like Fing (free, available on iOS and Android) scan your network and identify every connected device with clear labels. If something appears that you don’t recognise, investigate it — and change your Wi-Fi password if you suspect unauthorised access.
Also think about devices you no longer use. An old smart speaker sitting in a drawer but still connected to your Wi-Fi is an unnecessary risk. Disconnect devices you’re not actively using and factory reset them before storing or disposing.
Step 8: Be Selective About What You Connect
Not every appliance needs to be smart. The IoT market has expanded to include everything from connected toothbrushes to Wi-Fi enabled kitchen scales — but more connected devices means more potential entry points into your home network.
Before buying a new smart device, ask:
- Does the manufacturer have a track record of supporting their products with security updates?
- Does this device actually need an internet connection to do its job, or is the “smart” functionality just a bonus feature I’ll never use?
- Has this brand had any notable security incidents?
- Does it require creating an account with a third-party service, and if so, how is that data handled?
Buying fewer, better-quality devices from reputable manufacturers who take security seriously is one of the smartest long-term decisions you can make for your home network.
Real Attacks That Happened to Real Homeowners
Understanding the stakes makes the steps above feel less like theory. Here are the kinds of incidents that show up in security research and news reports every year:
Baby monitor hijacking: Multiple documented cases of attackers accessing Wi-Fi connected baby monitors through default credentials, watching sleeping children, and in some cases speaking through the device’s speaker.
Smart thermostat ransomware: Researchers demonstrated the ability to lock a smart thermostat and demand payment to restore normal function — a scenario now within reach of real attackers as thermostats become more powerful.
Security camera feeds leaked: Poorly secured IP cameras from various manufacturers have had their live feeds published to public websites, exposing the interiors of homes, offices, and shops to anyone with a browser.
Botnet recruitment: The Mirai botnet — first identified in 2016 but whose descendants still operate — compromised hundreds of thousands of home routers and IoT devices to launch some of the largest distributed denial-of-service attacks ever recorded. The devices’ owners had no idea.
In every case, the attack relied on weak or unchanged default passwords, unpatched firmware, or devices with no network isolation. All preventable with the steps above.
IoT Device Security Checklist
Work through this list and your smart home will be dramatically more secure than the average:
- Changed default passwords on every smart device
- Changed router admin username and password
- Enabled WPA3 (or WPA2) on router
- Updated router firmware and enabled auto-updates
- Disabled WPS on router
- Disabled UPnP on router
- Set up guest/separate network for IoT devices
- Enabled automatic firmware updates on all devices
- Enabled 2FA on all smart home app accounts
- Disabled unused features (remote access, Bluetooth, microphones)
- Audited connected devices in router admin panel
- Removed or factory reset devices no longer in use
Final Thoughts on How to Protect IoT Devices from Hackers
Protecting your IoT devices from hackers doesn’t require you to become a cybersecurity expert. It requires awareness, a few good habits applied once, and an occasional check-in every few months.
The steps in this guide — starting with your router and default passwords, then isolating your devices on a separate network — will put you significantly ahead of most home users. The majority of IoT attacks succeed because of basic, preventable oversights. Close those gaps, and you become a much harder target.
Your smart home should make your life easier and more comfortable — not hand a stranger a window into it.
Related reading: How to Secure Smart Home Devices: A Beginner’s Complete Guide | VPNs and IoT: How to Secure Your Smart Home Network | Voice Assistant vs Smart Home Hub: Which Do You Need?
Published on KontraNet IoT Hub — Your beginner-friendly guide to smart living and connected tech.
Useful:
Federal Trade Commission – consumer.ftc.gov,
Cybersecurity and Infrastructure Security Agency – cisa.gov
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