For a manufacturer, the catastrophic cyber loss is not a data breach — it is downtime. When ransomware crosses from the office network into the plant floor, production stops, orders go unfilled, contractual penalties accrue, and the business-interruption claim can dwarf any data-recovery cost. That is why manufacturing underwriters think less about confidentiality and more about resilience: can you keep making product, or restore the line fast, after an attack?
47 controls mapped to what underwriters verify · one-time purchase · instant download
Why cyber insurance is different for manufacturers
For a manufacturer, the catastrophic cyber loss is not a data breach — it is downtime. When ransomware crosses from the office network into the plant floor, production stops, orders go unfilled, contractual penalties accrue, and the business-interruption claim can dwarf any data-recovery cost. That is why manufacturing underwriters think less about confidentiality and more about resilience: can you keep making product, or restore the line fast, after an attack?
The technical reality underwriters probe is the boundary between IT (email, ERP, file servers) and OT (the PLCs, HMIs, SCADA, and industrial control systems that run the line). Decades of "flat" networks mean a phishing email in accounting can reach a machine controller, and legacy OT often runs unpatchable, end-of-life operating systems that cannot be touched without downtime. Frameworks like NIST SP 800-82 and the Purdue model exist precisely to enforce that IT/OT segmentation, and carriers increasingly ask whether it is in place.
The controls that move a manufacturing premium are therefore network segmentation between IT and OT, immutable/air-gapped backups that can restore both business systems and line configurations, EDR on the IT estate to stop ransomware before it pivots, and isolation of the end-of-life systems that cannot be patched. Underwriters also look closely at remote access — vendor and integrator connections into OT are a classic intrusion path. A manufacturer that can show a segmented network and a tested restore is a far more insurable risk than one whose whole plant shares one subnet.
The regulatory and contractual pressures underwriters expect manufacturers to have already accounted for.
Priority controls
Drawn verbatim from the 47-control Cyber Insurance Prep Checklist — with why each one matters specifically for your vertical.
Segment the network — servers and workstations on separate VLANs.
IT/OT segmentation is the control that stops office ransomware from reaching the plant floor — the difference between a contained incident and a production halt.
Replace or isolate end-of-life operating systems.
Legacy PLCs and HMIs run end-of-life operating systems that cannot be patched; isolating them is how underwriters expect that unfixable risk to be managed.
Keep at least one air-gapped or append-only backup.
An air-gapped backup of both business systems and line configurations is what lets a plant restart instead of paying to recover its production environment.
Deploy Endpoint Detection & Response (EDR) on all endpoints.
EDR on the IT estate catches ransomware before it pivots toward OT — carriers price down the business-interruption exposure when it is present.
Limit third-party vendor remote access to approved windows, with MFA.
Equipment vendors and integrators hold standing remote access into OT; uncontrolled, MFA-less vendor connections are a frequent intrusion path and a weighted question.
Define and document a recovery time objective (RTO).
A documented RTO directly informs the business-interruption sub-limit; manufacturers that can state and meet an RTO get better terms.
Do not expose Remote Desktop Protocol (RDP) directly to the internet.
Internet-exposed RDP into engineering or HMI workstations is a classic OT intrusion path and a common disqualifier.
These are 7 of the 47 controls. The full checklist covers all of them — required, premium-affecting, and disqualifying — with verification and remediation steps.
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For a manufacturer, the largest loss from a cyber attack is usually halted production, not stolen data. Underwriters concentrate on resilience — network segmentation, tested backups, and a realistic recovery time objective — because those controls determine how long the line stays down and how big the business-interruption claim becomes.
IT covers office systems like email and ERP; OT covers the PLCs, HMIs, and SCADA that run production. Without segmentation, a phishing email in the office can reach a machine controller. Carriers ask whether IT and OT are on separate, controlled network segments because that boundary is what keeps a routine ransomware event off the plant floor.
Unpatchable, end-of-life systems are common in OT and are not an automatic decline — but underwriters expect them to be isolated and tightly access-controlled rather than left on a flat network. Documenting how those legacy systems are segmented and monitored is exactly the kind of evidence that keeps a manufacturer insurable.
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