By Dave Sample, Advantex Network Solutions.
In the first article, we explored Cyber Essentials as a way for automotive manufacturers to demonstrate intent: a recognised commitment to baseline cyber security and supply-chain trust. In the second, we looked at Cyber Essentials Plus as proof: independent technical verification that key controls are in place and working as expected. This third article focuses on validation.
Manufacturers competing in higher-value markets such as aerospace, rail, defence and energy are increasingly expected to evidence cyber maturity. Formal certifications such as Cyber Essentials, Cyber Essentials Plus and Defence Cyber Certification (DCC) are important, but they are not always the end of the conversation.
Where two suppliers already hold similar accreditations, the ability to show that cyber controls are regularly tested through structured security penetration testing can become a powerful differentiator.
Penetration testing can strengthen tender responses, harden the supply chain and widen the gap between a business and its closest competitor.
Would Your Controls Survive A Real Attack?
Cyber Essentials, Cyber Essentials Plus and DCC all help demonstrate assurance. They show that a business has taken recognised steps to reduce cyber risk.
A live attack, however, does not follow an assessment checklist.
Attackers look for weak processes, exposed services, poor segmentation, excessive permissions, insecure remote access, gaps in monitoring and human error. They may move from an office device towards production systems, target supplier access or attempt to disrupt the infrastructure that keeps the business operational.
Manufacturers need to know if the controls they have put in place would actually slow, stop or expose a real attack.
Security penetration testing helps provide that answer. It validates controls under realistic conditions and creates additional evidence that can sit alongside formal certification. In a competitive tender, this can be valuable. When buyers are comparing suppliers with similar capability and accreditations, evidence of regular testing can increase confidence, strengthen scoring and improve the chances of being selected.
Blue, Red, and Purple Teams
Security penetration testing is often described using blue, red and purple team terminology.
The blue team represents the defensive side. This includes the people, processes and tools responsible for protecting the business, monitoring alerts, responding to incidents and maintaining security controls.
The red team acts like an attacker. Its role is to carry out controlled penetration testing activity, testing how far a realistic attack could progress and identifying weaknesses before a genuine threat actor finds them.
The purple team brings both sides together. Rather than treating penetration testing as a simple pass or fail exercise, the red and blue teams work collaboratively. The red team tests, the blue team observes and responds, and both sides use the results to close gaps, improve detection and strengthen defences.
Manufacturers often gain the greatest value from purple teaming because it turns penetration testing into improvement. It does not simply identify what went wrong; it helps the business understand how to fix it.
Testing Beyond Software Vulnerabilities
Vulnerability scanning is a vital part of cyber assurance, but penetration testing can go further.
A well-scoped red or purple team exercise may identify risks that are not simply missing patches. It may highlight weak network design, poor separation between IT and OT, excessive administrator access, insecure supplier connectivity, gaps in logging, unclear incident response processes or policies that do not reflect how the business actually operates.
These findings can be extremely valuable. They can help directors understand operational risk in practical terms, support investment decisions and provide stronger evidence that the business is actively improving its security posture.
They may also support cyber insurance conversations. Manufacturers that can demonstrate certification, regular vulnerability scanning, penetration testing and clear remediation may be viewed as lower risk, which could help reduce insurance premiums or improve renewal terms.
Most importantly, testing helps protect production. Mission-critical systems that could stop manufacturing, delay orders or create significant financial loss deserve focused attention.
Keeping Testing Proportionate
Security penetration testing can be one of the more expensive cyber exercises because it is labour intensive. Testing the entire environment in one exercise may be unrealistic for many automotive manufacturers.
A practical approach is to break the programme into smaller, focused phases. A business may start with mission-critical infrastructure, remote access, cloud services, supplier connectivity or the systems that directly support production. Testing can then expand over time based on risk, priority and budget.
The key is scope. Any exercise should be carefully defined before it begins so that it is accurate, fair and useful. Manufacturers should understand what is being tested, what is out of scope, who needs to be informed, how disruption will be avoided and how findings will be prioritised.
Done properly, penetration testing becomes a controlled improvement process, not a disruptive surprise.
Tuning SOC And MDR Services
Many manufacturers are now considering Security Operations Centre (SOC) or Managed Detection and Response (MDR) services to improve visibility and response.
Penetration testing can make these services more effective.
A red or purple team exercise can test if alerts are triggered, if the SOC or MDR provider responds as expected, and if escalation routes work in practice. When ran collaboratively, this can help the business and provider fine-tune detection rules, response playbooks and communication processes.
The result is greater operational confidence. The organisation is not simply implementing monitoring; it is validating its effectiveness through realistic attack simulations.
Validation To Confidence
Cyber Essentials demonstrates intent. Cyber Essentials Plus provides proof. Defence Cyber Certification can extend that assurance into MOD supply chains.
Security penetration testing adds validation.
North East automotive manufacturers looking to compete in higher-value markets can use that validation to stand apart. It shows potential customers that security is not treated as a one-off assessment, but as an ongoing discipline that is tested, improved and aligned to business risk.
In competitive supply chains, the manufacturer that can evidence regular penetration testing, clear remediation and stronger operational resilience may be the one that earns greater trust and ultimately succeeds in achieving diversification into new markets.
