Some of the biggest cybersecurity mistakes businesses make aren’t because they lack security. In fact, it’s often the opposite. They have antivirus, a firewall, backups and cloud systems, so they assume they’re adequately protected.
The problem is that cybersecurity doesn’t stand still. Businesses grow, people change, systems are added, cyber threats evolve, and security tools that were right a few years ago may no longer be enough. Even good security technology can leave a business exposed if it’s poorly configured, not maintained or simply assumed to be doing its job.
And that false sense of security can be dangerous.
Too often, security gaps only become apparent when something goes wrong. A compromised account, ransomware attack, data breach, or extended downtime can suddenly expose weaknesses that may have gone unnoticed for months or even years.
So, where are businesses still getting cybersecurity wrong? We spoke to Zinia’s cybersecurity team about the mistakes they continue to uncover when assessing real business environments, and what companies should be doing differently.
Here are 10 cybersecurity mistakes that may be leaving your business more exposed than you realise:
1. Not managing the security risks of legacy systems
Businesses across South Africa are still running critical operations on outdated software and hardware. That’s not necessarily bad, but the problems that come with it are.
One of our cybersecurity experts says: “Legacy systems are typically kept running without proper network segmentation, which means if one outdated machine is compromised, an attacker isn’t contained and can move laterally across the rest of the network with little resistance.”
He explains that the mindset behind this is understandable but risky: “it’s working, so why change it?” Modernising a system that still does the job feels like an unnecessary cost, especially when there’s no visible problem to point to.
When systems reach the end of their supported lifecycle, security updates may become unavailable or require special support arrangements. Known vulnerabilities can remain unaddressed, increasing the risk of compromise. Where immediate replacement isn’t practical, measures such as network segmentation, restricted access, monitoring and a phased replacement plan can help manage the exposure.
Unfortunately, businesses that hold onto this mindset tend to take cybersecurity seriously only after an incident has already happened. By then, the damage, downtime, and cost of recovery are far higher than the cost of proactive segmentation, monitoring, or a phased upgrade.
2. Overestimating how well your security controls are working
We have seen many executives walk into a penetration test or security audit meeting with us expecting a clean bill of health. So, when the report comes back with a long list of findings, the reaction is rarely relief. It’s usually shock.
The gap between what a business believes about its security posture and what an independent test actually uncovers is one of the most common, and dangerous, blind spots out there.
This overconfidence comes from assuming that if nothing has gone visibly wrong, nothing can go wrong. But the absence of an incident isn’t the same as the presence of security – it often just means no one has looked closely enough yet, or that an attacker hasn’t gotten around to testing the same weaknesses a proper audit would find.
Treat testing and audits as an ongoing discipline, not a one-off event to “pass”. The real risk isn’t the list of what is wrong; it’s discovering that list for the first time after a breach, rather than before one.
3. Treating cybersecurity as a checkbox exercise
For many businesses, cybersecurity gets treated like any other project with a start and end date: implement the firewall, install the antivirus, tick the box, and move on to the next priority. Once that box is ticked, the assumption is that the job is done, and attention shifts elsewhere, often for months or years at a time.
But cybersecurity isn’t a one-time fix; it’s a discipline you maintain. Nothing about it stays static:
- The threat landscape keeps moving – new vulnerabilities surface, attackers develop new techniques, and yesterday’s adequate protection can become today’s weak point.
- The business itself keeps changing – new staff, new systems, new data being collected, new third-party integrations – each one a potential gap that the original checklist never accounted for.
The businesses that stay protected are the ones that constantly assess their cybersecurity posture. That might mean scheduled reviews, periodic testing, or simply building the habit of asking “is this still adequate?” rather than assuming a past tick mark still holds true today.
4. Misconfigured products
A common problem is that a business brings in a service provider to install a security product, such as a firewall or endpoint protection, and once it’s up and running, everyone assumes the job is done.
But a security product is only as effective as the way it is configured and maintained.
The settings that were right when it was first installed may no longer be appropriate months or years later. Your business changes, new users and systems are added, access requirements evolve, and new risks emerge. Yet you may never review the configuration.
The problem often comes down to ownership. The business assumes the provider is keeping an eye on things, while the provider sees its role as having ended with the installation. That can leave configuration weaknesses sitting unnoticed in the environment.
Security products shouldn’t be treated as “set and forget”. They need ongoing maintenance, with settings and rules regularly reviewed to ensure they still match the business and the risks it faces.
5. Overlooking the risks of remote access
Remote access is a normal part of doing business today. Employees, IT teams and third-party providers may all need to connect to your systems from outside the business. But every route into your network needs to be properly secured and managed.
A real-world case
Zinia’s cybersecurity team recently handled an incident that shows how quickly a small configuration weakness can become a serious security risk.
A client had a third-party provider managing its firewall, which meant the provider had administrator access. A configuration error inadvertently left a port exposed to the internet. When an account belonging to the third-party provider was compromised, the attacker used those credentials to gain administrator access to the client’s firewall.
Within minutes, the attacker created a new profile that allowed them to VPN directly into the network.
Fortunately, the client had detection and response systems in place. The suspicious activity was detected quickly, and the response team locked out the compromised account, removed the attacker, and secured the environment.
It was a good outcome, but it highlights an important point: remote access isn’t just about how your own employees connect to the business. You also need to understand who else has access to your environment, how that access is secured and whether it is still necessary.
6. Underestimating the human side of cybersecurity
You can invest in sophisticated cybersecurity technology, but your employees are still either your biggest risk or your first line of defence.
One of Zinia’s cybersecurity specialists recently had a client question whether they could justify taking their entire team away from work for two hours to attend security awareness training.
It’s a fair business question. Two hours is a lot of lost productivity; across an entire team, it adds up. But consider the alternative. What would six hours of downtime cost the business if an employee clicked on a phishing email or unknowingly gave an attacker access?
Cybersecurity awareness training helps employees recognise the everyday threats they are likely to encounter, including:
- Knowing how to spot suspicious links, attachments and requests.
- Understanding why passwords and login details need to be protected (and more sophisticated).
- Recognising unusual requests for payments, information or account changes.
- Understanding how everyday actions online can introduce unnecessary risk.
- Knowing what to do, and who to tell, when something doesn’t look right.
The aim of training is to give people enough awareness to recognise when something may be wrong and act before a simple mistake becomes a bigger problem. But training works best alongside appropriate technical controls and a culture where employees can report suspicious activity without fear of blame.
7. Not understanding your real cybersecurity risk
How much cybersecurity does your business actually need? There isn’t one answer because not every business carries the same level of risk. Yet one mistake we see is businesses putting security measures in place without first understanding what they’re protecting and what a cyber incident could mean for the organisation.
A small professional services company with relatively few users and limited sensitive data has a very different risk profile to a healthcare provider holding patient information or a financial services business operating in a highly regulated environment.
To understand your own level of risk, consider:
- The data you hold: Do you store personal, financial, medical or other sensitive information?
- The size and complexity of your environment: How many users, devices, servers, applications, and networks need protecting?
- Your dependence on technology: What happens to the business if critical systems are unavailable for several hours or days?
- Your regulatory obligations: Are there industry-specific security and compliance requirements you need to meet?
For South African businesses, this also means understanding obligations under legislation such as the Protection of Personal Information Act (POPIA), where applicable. Cybersecurity decisions should reflect not only the systems you operate, but also the personal information you process and the potential consequences of a security incident.
- The potential business impact: What could an incident cost you in downtime, lost revenue, reputational damage or disruption to customers?
The key point is that your cybersecurity investment should match the risk your business faces. You can’t make good decisions about what to protect, where to invest, or which controls you need if you haven’t first understood your greatest cybersecurity risks.
8. Automatically renewing your security tools without assessing them
It’s renewal time. The invoice arrives, someone approves it, and your antivirus or other security software is renewed for another year.
Simple. But is it still the right protection for your business?
One cybersecurity mistake Zinia sees is businesses automatically renewing security products without reassessing whether those products still fit the environment they protect.
Your business may have changed considerably since a security solution was first implemented. You may have more employees, more devices, new cloud applications, different types of data or a much greater dependence on technology.
Before simply renewing, ask:
- Has our business grown? More users, devices and systems can change your level of exposure.
- Has the data we hold changed? You may now be storing more sensitive or valuable information.
- Has the way we work changed? Remote working, cloud applications and third-party access can introduce different risks.
- Have the threats changed? Cybersecurity evolves constantly, and what protected you several years ago may not be enough today.
- Does the product still match our risk? Your security tools should reflect the environment and level of risk your business has now, not when they were originally purchased.
Renewal time is a useful opportunity to stop and reassess, rather than simply approve another invoice. It shouldn’t automatically mean replacing a product or buying a more expensive one. Sometimes the existing technology is still appropriate but needs better configuration, management or integration with other security controls. The starting point should be understanding what the business needs, what is already working and where genuine gaps exist.
9. Spending on cybersecurity in the wrong places
Spending more on cybersecurity doesn’t necessarily mean you’re better protected. Where you invest matters just as much as how much you spend.
Zinia’s cybersecurity team sees businesses investing heavily in one area while leaving another comparatively exposed. One example is buying highly sophisticated endpoint protection while choosing the cheapest possible firewall, assuming the stronger product will somehow compensate for the weaker one.
But cybersecurity doesn’t work in isolation. Your firewall, endpoint protection, email security, identity controls, backups and other security measures form different layers of defence. A weakness in one can create an opportunity for an attacker, regardless of how much you have invested elsewhere.
This is also why buying the “best” security product isn’t necessarily the answer. The right investment depends on your business, the data you hold, your technology environment and where your greatest risks lie.
10. Not having the right people ready to respond
You can have excellent cybersecurity technology in place and still experience an incident. The question is: who takes over when that happens?
One mistake we sometimes see is businesses focusing heavily on preventing an attack without establishing who responds if one succeeds.
When an incident occurs, it isn’t the time to start working out who should do what. You need people who are ready to:
- Investigate the incident to understand what has happened and how the attacker gained access.
- Contain the threat quickly to prevent it spreading further through the business.
- Secure compromised accounts and systems and remove unauthorised access.
- Determine whether the attacker is still in the environment and identify anything else that may have been compromised.
- Investigate the root cause so that the weakness can be addressed and the same thing doesn’t happen again.
Without dedicated response capability, responsibility can easily fall to the internal IT person simply because they are “the IT person”, even if cybersecurity incident response isn’t their area of expertise.
The remote-access incident discussed earlier shows why this is important. Detection technology identified the suspicious activity, but the response team’s ability to act quickly contained the attacker and prevented the incident from disrupting the client’s business.
Having cybersecurity protection is important. Having people who know exactly what to do when that protection detects something is just as important.
Cybersecurity isn’t a once-off fix
If there’s one message that runs through these cybersecurity mistakes, it’s that having security measures in place doesn’t automatically mean your business is secure.
Your business, technology and employees change. And cyber threats certainly don’t stand still. The firewall, antivirus, or security processes that were right for your business two years ago may not be enough for today’s environment.
The good news is that you don’t have to fix everything at once.
When we asked Zinia’s cybersecurity team what businesses should prioritise if they could only address a few things in the next 30 days, their advice was practical:
- Start by understanding where you are most exposed – if you haven’t had a penetration test, consider one.
- Check whether your endpoint protection is still adequate for your business today.
- Make sure you have appropriate email protection in place, as email remains an important route attackers can use to target employees.
- Understand your data risk. Know what information you hold, how sensitive it is and what the impact would be if it were compromised. Once you understand your risk, it becomes much easier to decide what needs attention first.
Understand your risks before investing in more security
Cybersecurity isn’t about collecting the most tools or spending the biggest budget. It’s about understanding what your business needs to protect, where you’re exposed and which actions will make the greatest difference.
At Zinia, our Cybersecurity & Risk approach starts with understanding your environment and business priorities. From security assessments and penetration testing to managed security controls, monitoring and incident response capabilities, we help businesses identify risks and take practical steps to address them.
Whether you need to validate existing protection, investigate potential vulnerabilities or develop a more informed security plan, the right starting point is a clearer understanding of your current position. You can always talk to our team to help find your risks or vulnerabilities.
Want to learn more about cybersecurity protection, assessments and managing business risk? Explore Zinia’s Cybersecurity & Risk FAQs.