Penetration Testing for Manufacturers: IT, OT, and Physical Security Assessment
Manufacturing penetration testing is more complex than testing a corporate IT environment — it must account for the physical production environment, OT systems that cannot be taken offline, and the cascading consequences of disrupting production systems. Yet it is also more important: attackers do not respect production schedules, and an untested IT-OT boundary is an invitation to lateral movement. A well-scoped manufacturing penetration test provides the evidence base for prioritised remediation and demonstrates security maturity to customers and insurers.
Manufacturing organisations that conduct annual penetration testing are 60% less likely to suffer a successful ransomware attack — and 45% more likely to secure favourable cyber insurance terms.
Scoping a Manufacturing Penetration Test
A comprehensive manufacturing penetration test should include: external infrastructure assessment (all internet-facing systems, VPN endpoints, remote access portals, engineering web applications, and any OT systems with internet exposure); corporate IT internal assessment (simulating an attacker who has gained initial access via phishing or compromised credentials, with a focus on privilege escalation and lateral movement toward OT systems); IT-OT boundary assessment (testing the controls between corporate IT and production networks — can an attacker who has compromised a corporate laptop reach OT systems?); wireless assessment (corporate WiFi, guest WiFi, any wireless in production areas); and social engineering (phishing simulation and pretexting calls targeting procurement, engineering, and finance staff). OT system penetration testing should be conducted passively or in maintenance windows to avoid production impact.
Using Penetration Test Results in Manufacturing
Penetration test results for manufacturing organisations should be presented with explicit production risk context: each finding categorised not just by technical severity but by production impact if exploited (High severity + High production impact = immediate remediation required; High severity + Low production impact = remediation within 30 days; Medium severity = 90-day remediation). Results should be presented to both IT leadership and operational management — findings that relate to production system exposure require operational decision-making authority. The remediation roadmap should be integrated into the manufacturing security improvement programme and tracked through to closure with retest confirmation.
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