How to Secure Your Smart Home Devices

Smart home devices — voice assistants, security cameras, smart locks, thermostats, light bulbs, robot vacuums — have transformed homes into networks of internet-connected computers, most of which have weaker security than a decade-old laptop. Every device you add without taking security steps creates a potential entry point for attackers, a source of surveillance data for the manufacturer, and a target for botnet recruitment. This fits into the wider topic we cover in our Complete Guide to Online Security and Privacy.

The principles for securing your smart home are the same as for any computer: change default credentials, keep software updated, restrict network access, and minimise unnecessary data sharing. The challenge is applying these to dozens of devices from different manufacturers, each with its own app and settings interface. A systematic approach applied at setup — and revisited quarterly — is the only practical way to keep pace as the device count grows.

Network segmentation — the most important architectural decision

The single most effective step for securing your smart home is placing all smart devices on a separate network from computers, phones, and tablets. When a smart device is compromised, the attacker gains access to whatever network segment it occupies. If your laptop and smart TV share a network, a compromised TV can potentially reach the laptop. On separate networks with no routing between them, the compromised TV is isolated — it can reach the internet through the guest network but has no path to the primary network.

Every modern router supports a guest network that serves as the IoT isolation network:

1. Log into the router admin panel (typically 192.168.1.1 or 192.168.0.1)
2. Navigate to Wireless settings → Guest Network → Enable
3. Create a different SSID from the primary network (e.g., “IoT-Devices”)
4. Set a strong password
5. Enable “Client Isolation” or “AP Isolation” if available — prevents devices on the guest network from communicating with each other
6. Connect all smart home devices to this network, keep computers and phones on the primary

The devices still reach the internet and their cloud services through the guest network’s internet connection. They just have no path to the primary network where your laptop, NAS, and phones live. Setup takes about 15 minutes. Our guide on securing your home WiFi network covers the router configuration for this guest network setup in detail, including which settings to check for the strongest isolation between network segments.

What every new device needs at setup

Apply this checklist before putting any new smart device into regular use:

• Change the default admin credentials. Every smart home device ships with default credentials — many share the same defaults across all units of the same model. These defaults are publicly documented and among the first things automated scanners try. Use a strong unique password stored in your password manager. Cameras in particular: a security camera running factory-default credentials is findable by anyone using Shodan (a search engine for internet-connected devices) within seconds.
• Update firmware before first use. Devices sitting on retail shelves for months may have unpatched vulnerabilities by the time you purchase them. Check for and install firmware updates through the device’s app or admin interface before connecting to the live network.
• Disable features you don’t use. Many devices enable remote access, UPnP, RTSP streaming, Telnet, or other services by default that you may not need. Each enabled service is an additional attack surface. Review the settings and disable anything that doesn’t serve a purpose you actually need.
• Review app permissions. The companion app for each device typically requests more permissions than the device function requires — location, microphone, contacts. Grant only permissions directly necessary for the device to function. A smart light bulb’s app doesn’t need microphone access.
• Use a dedicated email address for device registrations. An email alias or dedicated address for all device registrations prevents manufacturers from linking your smart home registrations to your primary email identity. If the manufacturer’s database is breached, the exposure is limited to that dedicated address.

Cameras and smart locks — the physical safety layer

Security cameras and smart locks have physical safety implications that other devices don’t. They deserve additional attention.

For cameras:

• Enable two-factor authentication on the camera’s cloud account — even if credentials are stolen, live feed access still requires the second factor
• Check end-to-end encryption for video storage — Arlo, Eufy Security, and Ring have meaningfully different approaches to cloud storage encryption worth comparing before purchase
• Review account access logs periodically to confirm no unfamiliar logins have occurred
• Disable RTSP streaming and remote access features if you only access feeds through the manufacturer’s app

For smart locks:

• Check the lock’s access log periodically (through the manufacturer’s app) to confirm all entries and exits match people who should have access
• Review and revoke guest access codes regularly — a contractor given a temporary code last year should not still have active access
• Enable auto-lock so the door locks after a configured period if left unlocked
• Ensure the lock enforces rate limiting or lockout after repeated failed code attempts

For voice assistants (Alexa, Google Home, Siri): these are ambient microphones that activate on wake words and send recordings to cloud servers. Review and delete voice history:

• Amazon: Alexa app → Settings → Alexa Privacy → Review Voice History → delete all
• Google: myactivity.google.com → filter by Google Assistant → delete

Disable “Follow-up mode” and extended listening features that increase the window during which audio is captured. Most smart speakers have a physical microphone mute button — hardware-level confirmation the microphone is inactive during sensitive conversations.

The step-by-step network setup process

1. Audit connected devices. Log into the router admin panel → connected devices list. Note every device: name, IP address, MAC address. Any device you cannot identify should be investigated before proceeding. Audits frequently reveal devices users forgot about — old tablets, smart TVs from previous residences, devices set up years ago with forgotten credentials. Each discovered forgotten device is a potential security gap.
2. Create the IoT guest network as described in the first section — separate SSID, strong password, client isolation enabled.
3. Migrate smart home devices to the IoT network. For each smart device, change the WiFi connection through the device’s app or settings. Some devices require a factory reset to change networks — check the device documentation. Every non-computer, non-phone device should be on the IoT network after this step.
4. Update all device firmware. Check through each device’s app or admin interface. Install all available updates. For automatic update options: enable them, but verify quarterly that updates are actually running rather than failing silently.
5. Change all default credentials. Work through the device list — confirm each has a changed admin password stored in the password manager.
6. Enable 2FA on all smart home cloud accounts. Camera apps, smart lock apps, and hub apps all support 2FA. Enable it on each.
7. Disable UPnP on the router. UPnP allows devices to automatically open ports on the router — convenient for establishing cloud connections, but it’s also exploited by malware to create attack entry points. Disabling it requires manually port-forwarding any legitimate services that need external access, but removes the automatic port-opening risk.

Smart home security comparison — device categories

Device type	Main security risks	Priority controls	Update frequency
Security cameras	Default credentials; cloud account access; recording storage	Password change + 2FA + access log review	Check quarterly — critical for outdoor cameras
Smart locks	Physical access; guest code accumulation; cloud account	Access log review; guest code audit; auto-lock; 2FA	Check quarterly
Voice assistants	Ambient audio recording; voice history retention	Voice history deletion; mute button use; follow-up mode disabled	Automatic usually; verify quarterly
Smart TVs	ACR (automatic content recognition); network access to primary devices	Guest network isolation; disable ACR in settings	Usually automatic; check annually
Smart plugs/bulbs	Low individual risk; potential network pivot point	Guest network isolation; firmware updates	Low priority; check annually
Routers (smart)	Network-wide impact if compromised; default admin credentials	Admin password + firmware auto-update + UPnP disabled	Critical — check monthly

Ongoing maintenance — quarterly 30-minute review

The initial configuration must be paired with ongoing maintenance because the smart home ecosystem isn’t static — new devices are added, manufacturers release or stop releasing firmware updates, and the threat landscape evolves.

• Quarterly: check firmware versions for all devices through each device’s app; cross-reference against manufacturer release notes to confirm the latest version is installed; review the router’s connected devices list for any unfamiliar additions; verify automatic updates are running (not failing silently)
• Annually: review cloud accounts for each smart home service — check for unfamiliar login events; review and revoke guest access codes that are no longer needed; confirm 2FA is still active on all accounts; change passwords on any device whose credentials haven’t been rotated in over a year

Smart home security in 2026 matters more than it did in 2020 for a simple reason: the average household has added dozens of internet-connected devices without applying the same security discipline that it applies to computers and phones. The network segmentation approach in this guide directly addresses the gap between device count and security posture — isolating the weakest devices from the most sensitive ones so that compromise of one doesn’t cascade to the other.

Smart TV tracking — the overlooked privacy issue

Smart TVs deserve specific attention because they contain a feature called ACR (Automatic Content Recognition) that most users don’t know exists. ACR continuously samples what’s displayed on screen — including content from streaming apps, cable boxes, game consoles, and Blu-ray players connected via HDMI — and sends this data to the manufacturer and advertising partners to build detailed viewing profiles used for targeted advertising.

ACR is enabled by default on most major smart TV brands (Samsung, LG, Vizio, Sony, Roku) and is buried in privacy settings under different names:

• Samsung: Settings → Terms & Privacy → Privacy Choices → Internet-Based Advertising → Off; also disable “Viewing Information Services”
• LG: Settings → All Settings → General → AI Service → AI Recommendation → disable “Live Plus” and “Programme Suggestions”
• Vizio: Settings → System → Reset & Admin → Smart Interactivity → Off
• Roku: Settings → Privacy → Smart TV Experience → disable “Use Info from TV Inputs”; also Settings → Privacy → Advertising → “Limit Ad Tracking” → On

Disabling ACR doesn’t affect streaming app functionality or picture quality — it only stops the viewing data collection. On smart TVs already placed on the IoT guest network (isolated from computers and phones), disabling ACR addresses the data collection concern that guest network isolation alone doesn’t resolve.

Smart home devices and the manufacturer lifecycle problem

The security lifecycle of smart home devices is often much shorter than the physical lifespan of the device. Manufacturers typically support IoT devices with security updates for 2–5 years after release, after which no new patches are issued regardless of newly discovered vulnerabilities. A smart camera purchased in 2019 and still physically functional may have been out of security support since 2022, running unpatched firmware indefinitely.

Identifying end-of-support status for smart home devices requires checking the manufacturer’s website or their support forums — there’s rarely a prominent notification in the app when firmware support ends. For high-security-impact devices (cameras, locks), check the manufacturer’s update history: if the last firmware release was more than 18 months ago and the device is more than 3 years old, it’s likely no longer receiving security updates and should be replaced if it continues to be connected to the network.

The guest network isolation is particularly important for older devices whose firmware is no longer updated — isolating them from the primary network limits the attack surface of vulnerabilities that will never be patched, without requiring immediate replacement of functional hardware. If this sounds familiar, Remote Work Security is worth a look.

Securing your smart home is ultimately about applying proportionate controls to devices that weren’t designed with security as a primary concern. The guest network isolation, default credential changes, and firmware updates are the three controls that address the majority of smart home attack vectors — and all three can be applied to every device regardless of manufacturer or device type, providing a consistent security baseline across the heterogeneous ecosystem that most smart homes have become. Our guide on Network Security Basics covers an adjacent issue.