Cyber criminals rarely break in through the front door. More often than not, they find a way in through outdated or unsupported software that has been left unpatched. What looks like a small oversight can quietly turn into a major security incident.
The problem is growing fast. Attackers are exploiting newly disclosed flaws within days, while many organisations still take weeks or even months to apply fixes. This gap between discovery and defence gives criminals the perfect opportunity to strike.
For UK businesses the risk is about to increase further. Windows 10 reaches the end of support in October 2025 and millions of machines are still running it. Without updates these systems will quickly become a prime target, creating a costly and avoidable security headache.
The rising threat of exploited vulnerabilities
Exploited vulnerabilities are now one of the main ways attackers gain access to organisations. The Verizon Data Breach Investigations Report 2025 found that one in five breaches began with a vulnerability being exploited. This marks a sharp increase on previous years and reflects the growing role of outdated or poorly patched systems in real incidents.
Speed is the critical factor. Fortinet’s threat research shows that attackers are now exploiting some flaws within just five days of them being disclosed. In contrast, many businesses still take more than a month to apply security updates. Verizon’s data shows the median time to fix a vulnerability is thirty-two days, and many remain open for much longer.
The gap between the pace of attackers and the pace of defenders is widening. For businesses, this means that traditional patching cycles are no longer good enough. Critical fixes must be applied within days if they are to prevent costly breaches.
Ransomware and outdated software: A dangerous pairing
Ransomware remains one of the most disruptive threats facing businesses today, and outdated software is often the weak link that allows it to spread. Once attackers identify an unpatched vulnerability, they can use it as a foothold to deploy ransomware across entire networks.
The Verizon report shows that ransomware was present in forty-four per cent of breaches, a steep rise compared with the previous year. Sophos’ State of Ransomware 2025 survey further highlights that exploited vulnerabilities were the leading root cause in thirty-two per cent of ransomware incidents, outpacing stolen credentials.
For businesses of all sizes, this combination is particularly damaging. The immediate cost of ransom payments is only part of the story. Downtime, lost productivity, recovery expenses, and potential regulatory penalties can multiply the impact. Outdated or unsupported systems give attackers the easiest path in, turning a neglected update into a multi-million pound incident.
Windows 10 end of life
Windows 10 will officially reach the end of support on 14 October 2025. After this date Microsoft will no longer provide free security updates for the operating system. With Windows 10 still running on more than forty per cent of desktops worldwide, millions of machines are about to lose essential protection.
Microsoft has introduced an Extended Security Updates scheme for organisations that cannot move to Windows 11 immediately. In the UK, this comes at an additional cost of around twenty-five pounds per device for the first year, rising each year thereafter. For businesses with hundreds or thousands of endpoints, the cost quickly becomes significant, and the scheme should be viewed only as a temporary bridge rather than a long-term solution.
The National Cyber Security Centre advises that unsupported products should be treated as a distinct risk and replaced wherever possible. NHS Digital guidance also requires critical and high-severity vulnerabilities to be patched within fourteen days. Running Windows 10 beyond October 2025 without a clear migration plan risks leaving UK organisations exposed to attacks as soon as the first new exploits emerge.
The cost of falling behind
Falling behind on updates does not just create a technical risk. It carries a very real financial and regulatory cost. The IBM Cost of a Data Breach Report 2025 put the global average cost of a breach at around 3.4 million pounds. For UK organisations, the impact can be even higher when you add the potential for fines from the Information Commissioner’s Office under GDPR.
Certification frameworks also raise the stakes. Cyber Essentials, widely used by UK businesses and government suppliers, requires unsupported software to be removed from use. Continuing to run outdated systems risks losing certification and, with it, access to certain contracts.
The lesson is clear. The money saved by delaying upgrades or ignoring end of life notices is quickly outweighed by the financial fallout of a breach. Investing in updates, extended security support or migration planning costs far less than recovering from an incident that could have been prevented.
Why businesses struggle
If keeping systems up to date is so important, why do so many organisations fall behind? The answer lies in a combination of scale, complexity, and resource pressure.
The number of disclosed vulnerabilities continues to break records, with more than forty thousand new CVEs published in 2024 alone. For stretched IT teams this creates a near constant flood of updates to track, test, and deploy. With limited time and budget, patching often becomes reactive rather than proactive.
Legacy applications add another layer of difficulty. Many older systems are tied to outdated operating systems or rely on software that cannot be easily upgraded. Businesses can find themselves locked into running end of life products because critical processes still depend on them. This makes remediation slower and raises the risk that important patches are delayed or ignored altogether.
Patch fatigue also plays a part. When IT staff face a never-ending cycle of updates, urgent fixes can be lost in the noise. The result is that vulnerabilities remain open far longer than attackers need to exploit them.
Practical steps for businesses
Closing the gap between attackers and defenders requires more than awareness. UK organisations need clear, practical steps to reduce the risks that come from outdated or unsupported software. The good news is that many of these measures are straightforward to adopt.
- Audit your systems – Identify all devices and applications, paying special attention to anything approaching end of life.
- Prioritise critical fixes – Use trusted sources such as the NCSC and the CISA Known Exploited Vulnerabilities catalogue to focus on the flaws that are actively being targeted.
- Accelerate patching cycles – Aim to meet the UK standard of applying critical or high severity fixes within fourteen days.
- Plan for Windows 10 migration – Create a roadmap for moving to Windows 11 or, where necessary, budget for Extended Security Updates as a temporary measure.
- Automate where possible – Invest in patch management tools to reduce manual work and avoid patch fatigue.
- Address legacy systems – If an application cannot be updated, consider isolating it from the wider network or replacing it with a supported alternative.
By taking these steps, businesses can significantly reduce the risk that outdated software becomes the gateway for a damaging cyberattack.
Concerned about end of life software?
Outdated and unsupported software is more than just an inconvenience. It is one of the most common entry points for attackers and a growing cause of costly security breaches. With Windows 10 reaching the end of support in October 2025, businesses cannot afford to ignore the risks. Acting now to audit systems, prioritise updates, and plan migrations is far less expensive than recovering from a serious incident.
If you are concerned about end-of-life software in your business, or if you need help auditing your systems, applying updates, or planning a migration, the help4IT team is here to support you. Contact us today to arrange a free consultation and find out how we can help keep your organisation secure with robust cybersecurity services.
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