Smart devices are no longer a novelty confined to tech enthusiasts' living rooms. From thermostats and doorbell cameras to voice assistants and connected light bulbs, the average household now runs a small network of internet-connected gadgets around the clock. That convenience comes with a cost: connected households face nearly 30 IoT attack attempts every single day, according to a 2025 report from Netgear and Bitdefender that analyzed data from 6.1 million households. Keeping smart devices safe from hackers is no longer optional homework for IT professionals — it's a basic requirement for anyone who owns a smart speaker, camera, or lock.
The good news is that most successful attacks on smart homes don't involve sophisticated exploits or nation-state hackers. They rely on the same handful of weaknesses: default passwords, outdated firmware, and networks with no internal boundaries. Understanding those weaknesses, and closing them, is well within reach for a non-technical homeowner.
Why Smart Devices Are Such an Easy Target
Manufacturers competing on price and speed to market often treat security as an afterthought. Many devices still ship with generic default credentials such as "admin" or "1234," and a large share of buyers never bother to change them. Attackers know this, and they maintain databases of default logins for thousands of device models, which lets them scan the internet and break into unsecured devices within seconds.
The scale of the problem is easy to underestimate until you see it measured. A Which? investigation, run in partnership with the NCC Group and the Global Cyber Alliance, filled a test home with ordinary smart devices — TVs, thermostats, and security systems — and logged the incoming traffic. In a single week, the home was hit with over 12,800 unique scans and hack attempts, including more than 2,400 login attempts using weak default usernames and passwords. That's roughly 14 credential-stuffing attempts every hour, aimed at a house with nothing more exotic than a smart TV and a few sensors.
Streaming devices and smart TVs are consistently among the most exposed categories, together accounting for close to half of all detected security flaws in connected homes, with IP cameras not far behind. These devices tend to run outdated software, get fewer security updates than phones or laptops, and are rarely monitored the way a work computer would be.
The Real-World Consequences of a Compromised Device
It's tempting to think of a hacked smart bulb or thermostat as a minor inconvenience. In practice, a single compromised device can become a foothold into the rest of your home network, exposing laptops, phones, and any files or accounts connected to them.
The most infamous example remains the 2016 Mirai botnet attack, in which hundreds of thousands of poorly secured devices, including doorbell cameras, were hijacked and used to launch massive distributed denial-of-service attacks that knocked major websites offline. That single incident demonstrated how a garage full of smart plugs and cameras could be conscripted, without their owners' knowledge, into one of the largest cyberattacks in internet history.
More recent incidents have moved beyond botnets and into direct surveillance. Security researchers have documented cases where compromised smart cameras allowed strangers to watch a family's daily routine for weeks, using nothing more advanced than a default password that was never changed after setup. Camera feeds, door lock activity, and even microphone access on voice assistants represent some of the most sensitive data a device can leak, which is why cameras and locks deserve the most scrutiny of any device category in the home.
Start With Your Router, Not Your Gadgets
Every smart device conversation tends to start with the devices themselves, but the router is the actual front door to your network, and it deserves attention first. Change the router's default admin password immediately after setup, since this credential controls every other device on the network. Enable WPA3 encryption if your router supports it, or WPA2 at a minimum, and retire the factory-set Wi-Fi password that often ships printed on the bottom of the device.
Network segmentation is one of the more effective, if underused, protections available to ordinary households. Most modern routers support a guest network feature that can be repurposed to isolate IoT devices from the primary network used by computers and phones. If a smart plug or camera on the guest network is compromised, the attacker is contained there rather than gaining a path to your laptop, banking apps, or personal files. Security researchers and IoT security guides consistently point to this kind of network isolation, alongside strong authentication, as one of the most practical defenses against exactly this kind of lateral movement.
Firmware Updates Are Not Optional
Roughly 70% of connected devices in circulation carry unpatched firmware vulnerabilities, according to IoT security research compiled from multiple threat intelligence sources. Firmware is the software that runs a device at the most basic level, and manufacturers regularly release updates to patch newly discovered security holes. Unlike a phone, though, most smart devices don't nag you with update reminders, which means outdated firmware quietly accumulates unless a homeowner goes looking for it.
Set a recurring reminder, perhaps quarterly, to check each device's companion app or web interface for pending firmware updates. Many current-generation devices support automatic updates, and turning that setting on removes the burden of remembering entirely. When shopping for new smart devices, treat a manufacturer's update track record as a genuine buying criterion rather than an afterthought; a camera that's cheaper but hasn't received a security patch in two years is not actually the better deal.
Passwords, Two-Factor Authentication, and the Human Factor
Default credentials remain the single most exploited weakness in smart home security, and the fix is straightforward even if it's tedious. Every device should get a unique password rather than a variation on the same phrase, and a password manager makes this realistic for a household running fifteen or twenty connected gadgets rather than the two or three of a decade ago.
Two-factor authentication, where available, blocks the overwhelming majority of unauthorized login attempts even when a password has been guessed or leaked elsewhere. Voice assistants, smart lock apps, and camera platforms increasingly support this option, and enabling it takes a few minutes per account. It's one of the highest-leverage security steps available, precisely because it protects you even after a mistake has already happened elsewhere, such as reusing a password that later turns up in a data breach.
Choosing Devices With Security in Mind
Not every smart device deserves a place on your network. Emerging standards like Matter aim to create more consistent security baselines across brands, and devices built to that standard are generally a safer bet than obscure, ultra-cheap alternatives with no clear manufacturer support. Before buying, it's worth checking whether a company has a documented history of shipping timely security patches, since that pattern tends to predict how the device will be maintained after you bring it home rather than how it's marketed in the box.
It also helps to be deliberate about which devices actually need internet connectivity. A smart lock or camera has an obvious reason to be online; a coffee maker's connected features are harder to justify against the added attack surface. Limiting the number of connected devices in a household is itself a form of protection, since fewer devices mean fewer potential entry points for an attacker to probe.
A Realistic Way to Think About the Risk
It's worth resisting both extremes here. Headlines about mass camera hacks can make smart home ownership feel reckless, but security researchers who study these incidents note that most breaches trace back to weak passwords or someone the victim already knew, not sophisticated strangers deploying advanced tools. At the same time, dismissing the risk entirely ignores a household network that, on average, now fields close to 30 attack attempts a day.
The practical takeaway sits between panic and complacency: smart devices are safe enough to use, provided the basic hygiene outlined above is actually in place. A secured router, segmented network, current firmware, and unique passwords with two-factor authentication turn a smart home from an easy target into a genuinely difficult one, without requiring a background in cybersecurity to get there.
Take an inventory of every connected device in your home this week, check each one for a default password or a pending firmware update, and fix what you find. That single afternoon of maintenance addresses the majority of what actually gets exploited in the real world, and it's a far better use of time than worrying about threats that are, statistically, much less common than the mundane ones sitting unpatched on your own network right now.
Top comments (0)