We all know that cybersecurity is essential for SMBs and maintaining security should be a top priority. However, quantifying and measuring whether we’re secure enough can be a challenge. Because of this, we can often fall into the trap of assuming we’re secure because we’re yet to be hacked or proven otherwise.

This is where penetration testing comes in. It’s a way of finding out how secure your IT really is, by simulating what a real attacker might do if they tried to attack you. Because of it’s practical, real-world testing, it’s one of the most valuable tools you can use to protect your business, your data, and your reputation.

What Is Penetration Testing?

Penetration testing (or ‘pentesting’) is a controlled, ethical cyberattack. It’s carried out by security professionals who will try to break into your systems… with permission of course! This isn’t to cause damage, but to highlight where your weaknesses are. The security professional is called an ‘ethical hacker’; they can hack into your systems like a cybercriminal but are doing it to help you rather than to exploit you. It’s proactive, preventative and incredibly effective.

Whilst pentesting is very effective, it’s also very expensive and is often out of financial reach for SMBs. This is frustrating because pentesting is incredibly beneficial for smaller businesses. Due to this, virtual pentesting is now becoming commonplace with the market leader being Vonahi’s VPenTest. It offers the same depth of service but for a fraction of the price.

Vulnerability Scanning vs Penetration Testing

Vulnerability Scanning vs Penetration Testing is a common point of confusion. Vulnerability scanning in many cases is used interchangeably with pentesting – even by technical teams – even though this is incorrect and they’re not the same thing. Let us explain…

Vulnerability scanning is an automated process that checks your internal network for known issues, such as outdated software, weak passwords, or misconfigured devices. It’s useful, but it doesn’t show how those issues could be exploited.

Penetration testing, on the other hand, simulates an attack from outside your network. It doesn’t just find vulnerabilities, it tries to exploit them, showing how far an attacker could get and what damage they could do.

In short, vulnerability scans look for weaknesses inside your network. Penetration tests simulate attacks from outside, revealing real-world risks. Both are effective, but penetration testing is more comprehensive and highlights the severity of particular risks by showing how they can be exploited.

Common Vulnerabilities Found in SMB Networks

Vonahi’s research highlights several recurring issues in SMB environments—most of which stem from everyday oversights rather than complex exploits. These vulnerabilities often go unnoticed due to limited time, resources, or internal expertise, but they can open the door to serious breaches.

Some of the most common include:

• Weak or reused admin passwords, which allow attackers to move laterally across systems once they gain access.
• Unpatched Windows systems, leaving known vulnerabilities exposed to exploits like EternalBlue or BlueKeep.* See our short glossary at the end of this article if you’re unsure about these terms with an asterisk.
• Misconfigured printers and file shares, which can unintentionally expose sensitive data or grant unauthorised access.
• Legacy protocols such as LLMNR and NBNS*, vulnerable to spoofing attacks that lead to credential theft.
• Poor network segmentation, making it easier for attackers to navigate from one compromised device to others.
• IPMI* authentication bypass, where default or weak credentials on server management interfaces can be exploited.
• Multicast DNS (mDNS) spoofing, enabling attackers to redirect traffic by responding to DNS queries with malicious Ips*.
• IPv6 DNS spoofing via rogue DHCPv6*, allowing attackers to assign malicious DNS settings and intercept communications.

These aren’t obscure technical flaws—they’re common, fixable issues that attackers actively look for in SMB networks as easy gateways for exploitation.

How Does Penetration Testing Support Compliance?

Many SMBs pursue Cyber Essentials Plus* to meet basic security standards. We’re huge advocates of Cyber Essentials Plus and think it’s essential for every UK SMB. However, as with a lot of things, it isn’t perfect and we would be doing ourselves an injustice if we weren’t honest about that. For us, the biggest limitation CE+ has is that it only tests a random sample of devices. It’s completely possible for CE+ to test devices that have no issues, but there be exploitable issues in the majority – or even every single one! – of the non tested devices. Due to this, CE+ should be viewed as a snapshot. It’s a really great indicator of your overarching cybersecurity levels, but it’s not a full and comprehensive assessment.

This is where vPenTest goes further. It tests every device on your network, simulates actual attack scenarios, and provides detailed, actionable reports. This makes penetration testing a more reliable and comprehensive way to validate your security posture, especially if you’re working towards ISO 27001, are regulated by the FCA, or simply want complete peace of mind.

The Business Case for Penetration Testing

Penetration testing isn’t just a technical exercise – it’s a strategic investment to ensure business continuity and longevity.

It helps reduce risk by identifying and fixing vulnerabilities before they’re exploited. As we’ve discussed above, it supports compliance efforts, especially when preparing for audits or certifications. It also improves cost efficiency by helping teams prioritise patching based on real-world risk, rather than guesswork.

Most importantly, it builds trust. Clients, partners, and regulators want to see that you’re handling their data with care and take cybersecurity seriously. Penetration testing, especially when combined with CE+ and other compliance work, is a clear, proactive way to demonstrate that commitment.

Is Penetration Testing Worth It for SMBs?

Absolutely. Penetration testing used to be expensive, manual, and mostly reserved for large enterprises. But virtual platforms like Vonahi’s vPenTest have changed that. By automating the process, they’ve made it faster, more affordable, and accessible to smaller businesses.

This levels the playing field. SMBs can now get the same insights and protection as big corporations, without the hefty price tag. It’s like having a dedicated cybersecurity team on hand, but without the overhead.

Virtual pentesting also offers flexibility. You can run tests as often as needed, track improvements over time, and get detailed reports that help you prioritise fixes. Additionally, if you work with an IT partner, they will manage the testing for you and may even include some or all of the remediation work in the costings. For businesses with limited IT resources, that’s a game-changer.

Final Thoughts

Cybersecurity isn’t just a technical concern, it’s a business-critical priority. For SMBs, the challenge is balancing cost with capability. With virtual penetration testing, that balance is finally achievable. It allows SMBs to take control, identify risks early, and show your clients and stakeholders that you’re serious about protecting what matters.

If you’re ready to take that next step and explore how vPenTest could work for your organisation, we’re here to help. Fill in the form below to get the ball rolling.

Glossary

• EternalBlue
  A well-known Windows vulnerability that allowed hackers to spread ransomware like WannaCry. It affects unpatched systems and can be used to gain remote access.
• BlueKeep
  Another Windows flaw that lets attackers take control of a computer through Remote Desktop. It’s dangerous because it doesn’t require user interaction.
• LLMNR (Link-Local Multicast Name Resolution)
  A network feature that helps devices find each other, but it can be tricked by attackers to steal login details.
• NBNS (NetBIOS Name Service)
  An older system for naming devices on a network. Like LLMNR, it can be spoofed to capture credentials.
• IPMI (Intelligent Platform Management Interface)
  A tool used to manage servers remotely. If not secured properly, it can give attackers deep access to your infrastructure.
• mDNS (Multicast DNS)
  Helps devices discover each other on local networks. Attackers can exploit it to redirect traffic to malicious systems.
• IPv6 DNS Spoofing
  A method where attackers use newer internet protocols to mislead devices and intercept data.
• DHCPv6
  A system that assigns IP addresses to devices. If compromised, it can be used to reroute traffic or inject malicious settings.
• Cyber Essentials Plus (CE+)
  A UK government-backed certification that shows your business meets basic cybersecurity standards. It includes hands-on testing of your systems.