For our 30th episode, we're tackling the cybersecurity blind spot that almost no one discusses but everyone should worry about. You've secured your laptops. You've rolled out multi-factor authentication. Your firewall is properly configured. But what about that office printer quietly storing every contract and payslip you've printed this year on a hard drive nobody ever wipes, with a password an attacker can guess in three tries?

This episode reveals the uncomfortable truth about Internet of Things (IoT) devices in your business. We're talking about printers, CCTV systems, smart thermostats, networked door locks, and every other "smart" device you've stopped thinking about as a computer. These forgotten devices are giving attackers a free pass into networks that are otherwise properly secured.

We share a real case study from our recent emails about a marketing agency that spent £15,000 on security, passed their audit with flying colours, and still got breached through their office printer. This isn't theoretical paranoia. This is happening right now to businesses that think they've got security sorted.

Modern offices are full of computers disguised as other things. Every printer, every CCTV camera, every smart thermostat, and every networked door lock is actually a computer connected to your network. Most businesses secure their obvious computers whilst completely forgetting about these devices, creating perfect entry points for attackers who aren't bothering with sophisticated social engineering when they can just log in with "admin/admin".

A 30-person marketing agency listened to our ransomware and authentication episodes, then invested £15,000 in proper security: new firewalls, endpoint protection, hardware authentication keys for every staff member, and a security audit that came back clean. Two months later, they discovered someone had been accessing their client files for weeks through their HP printer that still used factory default credentials. The printer had full network access and stored copies of everything printed. Nobody had changed the password. Nobody had checked it during the audit. Nobody even thought about it.

Attackers maintain databases of default passwords for thousands of devices. They don't need to crack complex passwords when they can try "admin/admin" or "admin/password" and gain access to printers, cameras, or thermostats within seconds. These devices often ship with administrative interfaces accessible from the network, and most businesses never change the defaults because they don't think of these devices as security concerns.

Network segmentation sounds enterprise-level complicated, but the basic concept is simple: not everything on your network should be able to access everything else. Your printer doesn't need access to your accounting server. Your CCTV system doesn't need to reach your customer database. Creating separate network zones for different device types means a compromised printer can't become a stepping stone to your sensitive data.

Most small businesses have no accurate list of what's actually connected to their network. They know about the laptops and servers but often forget about the smart coffee machine someone plugged in last year, the wireless access points in the meeting rooms, or the networked thermostat the facilities team installed. Without knowing what's connected, you can't secure it. We discuss practical methods for discovering and documenting every device on your network.

We break down actionable steps that don't require enterprise budgets or dedicated security teams. This includes conducting device audits, changing default passwords, implementing basic network segmentation, regular firmware updates, and creating ownership responsibility for every connected device. The goal is proportionate security that's actually achievable for small businesses.

This episode is particularly relevant for:

We've covered passwords, multi-factor authentication, ransomware, supply chain attacks, shadow IT, and social engineering across 30 episodes. We've discussed major breaches at household names and examined what it takes to protect heads of state. But we've deliberately avoided IoT security until now because we knew it would make people uncomfortable, possibly angry, and definitely worried.

The uncomfortable truth is that whilst you've been securing laptops and servers, your office printer has had full network access, stores every document you print, and still uses the password it shipped with. The CCTV system protecting your premises might be livestreaming to the internet because nobody changed the default settings. The smart thermostat saving you money on heating is potentially giving attackers a way into your network.

This isn't theoretical paranoia. We're seeing breaches through IoT devices happen to businesses that have otherwise invested properly in cybersecurity. The marketing agency case study we discuss spent £15,000 on security and still got breached through a printer nobody thought to check during the security audit.

IoT security is the blind spot in small business cybersecurity. This episode gives you the knowledge and practical steps to finally address it without enterprise budgets or dedicated security teams.

This milestone episode also marks an important achievement for the podcast. Since launching in June 2025, we've:

We're genuinely grateful to everyone who's been listening, sharing, and most importantly, doing the work. The chart positions and download numbers are nice, but what matters more is when someone emails to say they've finally sorted Cyber Essentials or retired Dave from IT as a single point of failure.

Episode 31 (Next Week): Regular episode format continues with another crucial small business cybersecurity topic

Episode 32 (22nd December): Christmas Special - a festive take on cybersecurity for small businesses

If you need direct assistance with IoT device security, Cyber Essentials, network segmentation, or any topic we've covered, contact us at: [email protected]

Visit thesmallbusinesscybersecurityguy.co.uk for:

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With over 40 years in IT and cybersecurity across enterprises including Intel, Disney, and BBC, Noel now serves as CIO/Head of Technology for a boutique security-first MSP. He brings enterprise-level expertise to small business constraints, translating million-pound solutions into hundred-pound budgets. His mission is making cybersecurity practical and achievable for resource-constrained small businesses.

Former government cyber analyst, Mauven, brings systematic threat analysis and government-level security thinking to commercial reality. With her Glasgow roots and ex-government background, she translates complex security concepts into practical advice for small businesses, asking the questions business owners actually need answered.

Regular contributor and co-host for special episodes, Graham adds additional perspective and helps make complex cybersecurity topics accessible to small business audiences. His role includes managing the legal disclaimers and ensuring content remains grounded in practical business reality.

Everything discussed in this episode is for general guidance and educational purposes. It's meant to point you in the right direction but absolutely shouldn't be treated as professional advice tailored specifically to your business. Your situation is unique. What worked brilliantly for one business might be completely inappropriate for another.

We do our very best to keep everything accurate and current, but the cybersecurity world moves faster than a caffeinated squirrel. Things can change between when we record and when you're listening, so always double-check critical technical details with qualified professionals before making major changes to your systems.

If we've mentioned any websites, products, or services, we're giving you information, not necessarily endorsing them. We can't be responsible for what happens on their end or if things go sideways when you use them.

If you're dealing with serious cybersecurity incidents, actual data breaches, or complex compliance issues, please talk to proper professionals rather than just relying on podcast advice. We're here to educate and help you understand the landscape, not to replace your security consultant, solicitor, or IT team.

Think of us as your knowledgeable mates down the pub who work in cybersecurity, not your official contracted consultants. We care about your business, but we're not your insurance policy.

Stay safe out there, keep learning, and remember: when in doubt, get a second opinion from someone who can see your specific situation.

This has been a Small Business Cyber Security Guy production. Copyright 2025, all rights reserved.

Episode 30 | December 2025 | The Small Business Cyber Security Guy Podcast