IEC 62443 OT Cybersecurity Risk Assessment
Field Checklist for Oil & Gas Sites
From Compliance Pressure to Operational Confidence - A Practical IEC 62443 Risk Assessment for Oil & Gas
In high-consequence oil & gas environments, cybersecurity is no longer just an IT concern-it is directly tied to process safety, uptime, and regulatory accountability. Shieldworkz developed this IEC 62443 OT Cybersecurity Risk Assessment Field Checklist to help operators move beyond theoretical compliance and perform structured, on-site evaluations of their control systems, safety networks, and connected assets. Built by practitioners who understand how refineries, pipelines, and offshore facilities actually run, this checklist enables teams to identify real risks, validate existing protections, and prioritize remediation without disrupting operations.
Why this checklist matters
Industrial control systems are safety-critical. A cyber incident in OT can cause environmental damage, production loss or even loss of life. IEC 62443 gives the standard framework-this checklist converts the standard into the practical items you must verify on site: current network diagrams vs as-built wiring, asset inventory completeness, default credential checks, SIS independence, and remote-access session control. It’s not a theory document - it’s a pragmatic, auditable toolkit designed to surface unacceptable risks (internet-exposed HMIs, default passwords on safety controllers, bidirectional SIS links) so you can act quickly and defensibly.
Why you should download it now
Operationally usable: Written as a walk-around worksheet and a post-assessment risk register so your team can evidence findings to regulators and the board.
Compliance-aligned: Maps directly to IEC 62443 clauses (FR1-FR7) and shows how to verify SL-T vs SL-A for each zone.
Oil & Gas specific: Includes checks for pipelines, compressor stations, wellheads, dynamic positioning, flare control and custody transfer systems - items that generic checklists miss.
Prioritisation guidance: Built-in risk scoring and a remediation matrix (Critical → Immediate, High → 30-90 days) to help you focus scarce maintenance windows on the highest safety and business risk items.
Key takeaways from the checklist
See everything that matters: Complete OT asset discovery (PLCs, RTUs, HMIs, historian, EWS) and reconciliation with passive discovery tools is the first control - you can’t secure what you can’t see.
Protect safety systems first: SIS/ESD components must be treated as minimum SL-3 assets - verify independence, firmware integrity checks and absence of unapproved remote paths.
Reduce exposure: Remove or justify all external connectivity to OT, enforce DMZ and deny-by-default firewall rules, and validate unidirectional data flow where required (data diodes).
Vendor & remote access control: All third-party sessions must be session-approved, time-boxed, recorded and routed through PAM/jump servers - stale vendor accounts are a recurring root cause.
Make safety-driven tradeoffs: The checklist helps you document compensating controls for EoL or unpatchable devices (isolation, monitoring) while you plan replacements.
How Shieldworkz supports your assessment and remediation
Shieldworkz delivers the checklist plus services designed to speed from discovery to risk reduction:
On-site assessments using the field checklist and industry-safe passive tools to map assets and traffic without disrupting operations.
SL verification & gap analysis that produces an evidence-based remediation roadmap tied to IEC 62443 SRs and prioritized by safety and business impact.
OT-aware monitoring & detection to convert compensating controls into 24/7 visibility so interim risks are managed while replacements or patches are scheduled.
Governance & CSMS advisory to embed OT controls into change management, procurement, vendor contracts and board-level reporting.
Tailored workshops for operators, engineers and leadership focused on OT-specific incident response, safe forensic procedures and vendor access discipline.
Take the First Step Toward a Safer, More Resilient OT Environment
Fill the form to download the IEC 62443 OT Cybersecurity Risk Assessment Field Checklist for Oil & Gas Sites and secure a complimentary 30-minute consultation with one of our OT assessors. We’ll help you prioritise the top 3 actions you can take within your next maintenance window to materially reduce safety and operational risk.
Fill the form to download and book your free consultation - take the first step to a measurable, auditable OT cybersecurity program.
Download your copy today!
Get our free IEC 62443 OT Cybersecurity Risk Assessment Field Checklist for Oil & Gas Sites and make sure you’re covering every critical control in your industrial network
