Why Your Smart Home Network Is a Security Risk
The average UK household now has more than 20 internet-connected devices — smart speakers, video doorbells, thermostats, robot vacuums, security cameras, smart plugs, and more. Each one of those devices is a potential entry point for cybercriminals. Unlike your laptop or smartphone, most smart home gadgets run lightweight firmware with limited built-in security, and many are rarely — if ever — updated by their owners.
The threat is real. Attackers routinely scan the internet for poorly secured IoT devices, using them to launch large-scale attacks, spy on households, or gain a foothold on the same network as your banking laptop. The good news is that with the right approach, you can dramatically reduce your exposure without needing a degree in computer science.
This guide covers everything you need to know to lock down your smart home network in 2026, including the new legal protections now available to UK consumers under the Product Security and Telecommunications Infrastructure (PSTI) Act.
Understanding the Threat Landscape
Before diving into solutions, it helps to understand how attackers actually target smart homes. There are three primary methods:
- Lateral movement: An attacker compromises a low-security device — say, a cheap smart bulb or an older IP camera — and uses it as a stepping stone to reach more valuable devices on the same network, such as a NAS drive, a work laptop, or a device storing financial information.
- Botnet recruitment: Your smart devices are hijacked and conscripted into a botnet, where their processing power is used to carry out Distributed Denial of Service (DDoS) attacks against third parties. You may never notice, but your broadband performance can suffer.
- Direct exploitation: Attackers target known vulnerabilities in specific device firmware — particularly on older or unsupported hardware — to gain direct access to your home network or the device itself.
The most effective defence against all three is network segmentation — keeping your smart devices isolated from your trusted devices. We'll cover exactly how to do that below.
Step 1: Harden Your Router
Your broadband router is the front gate of your digital home. Most people leave it configured exactly as it arrived from their ISP, which is a significant mistake. Here's what to change immediately.
Change the Default Admin Password
Every router ships with a default administrator username and password — often something as obvious as "admin" and "password". These are publicly documented and the first thing any automated attack script will try. Log into your router's admin panel (usually accessible at 192.168.1.1 or 192.168.0.1 in your browser) and set a long, unique passphrase you don't use anywhere else.
Enable WPA3 Encryption
If your router supports it, switch your Wi-Fi security protocol to WPA3. It provides significantly stronger protection than the older WPA2 standard, including individualised data encryption that makes it much harder for attackers to crack your Wi-Fi password even if they capture network traffic. Most routers sold in the UK since 2021 support WPA3, though you may need to enable it manually in the wireless settings.
Disable WPS
Wi-Fi Protected Setup (WPS) was designed to make connecting devices easier, but it has well-documented security vulnerabilities that allow attackers to brute-force their way onto your network. Disable it entirely in your router settings — you won't miss it.
Disable UPnP
Universal Plug and Play (UPnP) allows devices on your network to automatically open ports in your router's firewall. While convenient, it means a compromised device can punch holes in your defences without your knowledge. Unless you have a specific need for it, turn it off.
Disable Remote Administration
Remote administration allows your router to be configured from outside your home network. Unless you have a very specific reason to need this, disable it. Your router should only be configurable from within your home.
Keep Router Firmware Updated
Router manufacturers regularly release firmware updates that patch security vulnerabilities. Check your router's admin panel for firmware updates at least every few months, or enable automatic updates if your router supports them. This is especially important if you're using a third-party router rather than your ISP's hub.
Step 2: Upgrade Your Router If Necessary
Most ISP-supplied hubs — including those from BT, Sky, Virgin Media, and TalkTalk — are functional but often a generation behind in Wi-Fi technology and security features. If you have a large home, thick walls, or more than 15–20 connected devices, a third-party router or mesh system is worth considering.
Recommended Routers for UK Smart Homes in 2026
| Router | Type | Wi-Fi Standard | Approx. UK Price | Best For |
|---|---|---|---|---|
| TP-Link Archer AX73 | Single unit | Wi-Fi 6 | £68–£95 | Smaller homes, budget upgrade |
| ASUS RT-AX88U Pro | Single unit | Wi-Fi 6 | ~£220 | Gigabit broadband, power users |
| TP-Link Deco XE75 (3-pack) | Mesh system | Wi-Fi 6E | ~£318 | Larger homes, 20–40+ devices |
| eero Pro 7 (3-pack) | Mesh system | Wi-Fi 7 | ~£700 | Premium, future-proofed homes |
The TP-Link Archer AX73 (available from Amazon UK and other retailers for around £68–£95) is an excellent mid-range upgrade that supports WPA3, guest networks, and regular firmware updates. For larger homes, the TP-Link Deco XE75 mesh system (around £318 for a 3-pack) provides whole-home coverage with Wi-Fi 6E and solid security features. The ASUS RT-AX88U Pro (around £220) is ideal for those on gigabit broadband plans, featuring a 2.5 GbE WAN port and comprehensive security controls. At the premium end, the eero Pro 7 (around £700 for a 3-pack) offers Wi-Fi 7 performance and is available from Amazon UK and John Lewis.
All of these models are available from UK retailers including Amazon UK, Currys, John Lewis, and Argos.
Step 3: Segment Your Network
Network segmentation is the single most effective thing you can do to protect your smart home. The idea is simple: keep your smart devices on a completely separate network from your trusted devices (laptops, phones, tablets, NAS drives). That way, even if a smart device is compromised, the attacker cannot reach your sensitive data.
Option A: Use a Guest Network (Easiest)
Most modern routers — including many ISP hubs — support a guest Wi-Fi network. This creates a separate SSID (network name) that is isolated from your main network. Simply connect all your smart home devices to the guest network and keep your computers and phones on the main network.
This is not as robust as a full VLAN setup, but it provides meaningful protection with minimal technical effort. Check your router's admin panel or app for a "Guest Network" or "Guest Wi-Fi" option.
Option B: Set Up a Dedicated IoT VLAN (Advanced)
For those who want stronger isolation, a Virtual Local Area Network (VLAN) provides proper network-level separation. This requires a VLAN-capable router (such as those running OpenWrt, OPNsense, or the Ubiquiti UniFi ecosystem), a managed network switch for wired devices, and a wireless access point that supports multiple SSIDs.
A typical home VLAN setup might look like this:
- VLAN 20 – Trusted: Personal computers, smartphones, tablets, NAS drives
- VLAN 30 – IoT: Smart speakers, cameras, thermostats, smart plugs, robot vacuums
- VLAN 40 – Guest: Internet-only access for visitors
Firewall rules are then configured to block traffic from the IoT VLAN to the Trusted VLAN, while allowing IoT devices to reach the internet. This means a compromised smart camera cannot communicate with your laptop, even if both are connected to the same physical router.
One thing to be aware of: protocols like Chromecast and AirPlay use multicast DNS (mDNS) for device discovery, which doesn't cross VLAN boundaries by default. If you want to cast from your phone to a Chromecast on the IoT VLAN, you'll need to enable an mDNS reflector on your router. This is a more advanced configuration step, but it's well-documented for popular platforms like OPNsense and UniFi.
Step 4: Practise Good Device Hygiene
Network segmentation protects you at the infrastructure level, but individual device security matters too.
Use Strong, Unique Passwords
Every smart device and its associated app account should have a unique, complex password. Use a reputable password manager — such as Bitwarden (free), 1Password, or Dashlane — to generate and store these. Never reuse passwords across devices or services.
Enable Two-Factor Authentication
Enable two-factor authentication (2FA) on every smart home app account that supports it — Google Home, Amazon Alexa, Apple Home, Ring, Nest, Hive, and so on. Use an authenticator app (such as Google Authenticator or Authy) rather than SMS-based 2FA where possible, as SMS codes can be intercepted via SIM-swapping attacks.
Keep Firmware Updated
Enable automatic firmware updates on every smart device that supports it. For devices that require manual updates, set a monthly reminder to check. Manufacturers regularly patch security vulnerabilities in firmware updates — an unpatched device is a sitting target.
Pay particular attention to older devices. If a manufacturer has stopped releasing updates for a product, consider replacing it. An unsupported device with known, unpatched vulnerabilities is a genuine liability on your network.
Disable Features You Don't Use
Many smart devices come with features enabled by default that you may never use — remote access, voice activation, cloud storage, and so on. Review the settings of each device and disable anything you don't actively need. Fewer active features means a smaller attack surface.
Review App Permissions
Smart home apps often request access to your location, contacts, microphone, and camera. Review the permissions granted to each app on your phone and revoke anything that isn't strictly necessary for the device to function.
Step 5: Monitor Your Network
Knowing what's on your network is the first step to spotting anything that shouldn't be there.
Use a Network Scanner
The free Fing app (available on iOS and Android) is an excellent tool for scanning your home network and identifying every connected device. It shows you the device name, manufacturer, IP address, and MAC address. Run a scan periodically and investigate anything unfamiliar. Fing also alerts you when new devices join your network, which can be an early warning sign of unauthorised access.
Check Your Router's Connected Devices List
Your router's admin panel will also show a list of connected devices. Cross-reference this with what you expect to see. If you spot an unknown device, change your Wi-Fi password immediately and investigate further.
Monitor for Unusual Traffic
Some routers — particularly those running OPNsense or pfSense — include traffic monitoring tools that can alert you to unusual data patterns. A smart device that suddenly starts sending large amounts of data to an unfamiliar server is a red flag worth investigating.
Step 6: Understand Your Rights Under the PSTI Act
UK consumers now have meaningful legal protections when it comes to smart device security, thanks to the Product Security and Telecommunications Infrastructure (PSTI) Act, which came into force on 29 April 2024.
Under the PSTI Act, manufacturers of consumer connectable products — including smart speakers, cameras, thermostats, doorbells, and other smart home devices — are legally required to:
- Ban universal default passwords: Devices must not ship with a single default password shared across all units (such as "admin" or "1234"). Each device must have a unique password, or the user must be prompted to set one during setup.
- Provide a vulnerability disclosure policy: Manufacturers must publish a clear process for security researchers and users to report vulnerabilities.
- State the support period: Manufacturers must clearly communicate how long the device will receive security updates, so consumers can make informed purchasing decisions.
Non-compliance can result in fines of up to £10 million or 4% of global revenue, whichever is greater. The Office for Product Safety and Standards (OPSS) is responsible for enforcement.
In practical terms, this means you should now be able to find out — before you buy — exactly how long a device will be supported with security updates. If a manufacturer cannot or will not provide this information, that's a significant red flag. When shopping at UK retailers such as Currys, John Lewis, or Argos, look for this information on the product packaging or the manufacturer's website.
Quick-Reference Security Checklist
Use this checklist to audit your smart home security:
- ☐ Changed router admin username and password from defaults
- ☐ Enabled WPA3 encryption on Wi-Fi (or WPA2 if WPA3 not available)
- ☐ Disabled WPS on router
- ☐ Disabled UPnP on router
- ☐ Disabled remote administration on router
- ☐ Router firmware is up to date
- ☐ Smart devices connected to a separate guest network or IoT VLAN
- ☐ Unique, strong passwords set for every device and app account
- ☐ Two-factor authentication enabled on all smart home app accounts
- ☐ Automatic firmware updates enabled on all devices (or manual check scheduled monthly)
- ☐ Unused device features disabled
- ☐ Network scanned with Fing or similar tool
- ☐ Checked support period before purchasing new devices
Pros and Cons of a Fully Secured Smart Home Network
Pros
- Significantly reduced risk of lateral movement attacks
- Personal data and financial accounts better protected
- Greater visibility into what's on your network
- Peace of mind when adding new devices
- PSTI Act gives you legal recourse against non-compliant manufacturers
Cons
- Initial setup of VLANs requires technical knowledge and compatible hardware
- Some smart home features (casting, local discovery) may need additional configuration across VLANs
- Ongoing maintenance required — firmware updates, periodic audits
- Premium routers with full VLAN support can be expensive
Final Thoughts
Securing a smart home network doesn't have to be overwhelming. Start with the basics — change your router's default password, enable WPA3, disable WPS and UPnP, and move your smart devices onto a guest network. These steps alone will put you ahead of the vast majority of UK households and eliminate the most common attack vectors.
If you're comfortable going further, setting up a proper IoT VLAN with firewall rules provides a much stronger level of isolation and is well worth the effort for anyone with a large number of connected devices or sensitive data on their network.
Finally, take advantage of the protections now available under the PSTI Act. Check the support period before buying any new smart device, and favour manufacturers who are transparent about their security commitments. A smart home should make your life easier — not leave you exposed.
