Use Case
Protecting Refinery Distributed Control Systems
Industry: USE CASE | OIL & GAS | REFINING
No signup required!
Turning Refinery DCS Security Advisories Into Actionable Decisions
A refinery operating a Crude Distillation Unit (CDU) and a Fluid Catalytic Cracker (FCC) had a DCS platform that had been installed and expanded over more than fifteen years. When the DCS vendor issued a security advisory, the refinery could not determine which controllers were running the affected firmware.
There was no established process for assessing vendor advisories against the actual controller inventory, and DCS-level changes were generally avoided rather than evaluated through a documented risk decision. Shieldworkz established controller-level visibility across both units and built a shared patch assessment process so future advisories could result in documented, risk-based decisions.
Value proposition: Controller-level DCS visibility, vulnerability assessment, risk-based prioritization, shared patch governance, continuous monitoring, and documented lifecycle management built around refinery unit criticality and redundancy.
Refinery DCS Cybersecurity Challenges
Refineries operating long-established DCS environments can accumulate uncertainty as systems are expanded and modified over many years. This makes security advisories and lifecycle decisions difficult to assess:
No controller-level inventory. Determining whether a vendor advisory affected a controller required physically checking cabinets unit by unit.
Default to no action. DCS changes were avoided by default rather than evaluated through a considered risk decision.
Informal patch decisions. The most senior engineer on a unit could make the patching decision independently.
Limited cybersecurity authority. Unit engineering treated DCS-level changes as its own domain, limiting shared cybersecurity ownership.
Growing audit scrutiny. Process safety audits increasingly asked specifically about DCS patch management and lifecycle practices.
Understanding the Refinery DCS Cybersecurity Risk Landscape
A DCS environment that has grown through more than fifteen years of expansions can become difficult to assess when a new security advisory arrives. Without controller-level visibility, engineering teams may not know which systems are affected, what firmware versions are installed, or how a potential change could affect a critical unit.
This uncertainty can lead to a default approach of avoiding DCS changes altogether. While this may reduce immediate operational disruption, it does not provide a documented basis for deciding whether a vulnerability requires action, whether a controller can safely be patched, or whether compensating controls are needed.
Refinery DCS security decisions also need to account for controller redundancy and unit criticality. A uniform patching approach may not be appropriate across every controller or process unit.
Shieldworkz addresses this by establishing controller-level asset visibility, assessing current inventory against vendor advisories, prioritizing findings according to redundancy and criticality, and creating a shared decision process between cybersecurity and unit engineering.
Common Cybersecurity Challenges Affecting Refinery DCS Environments
Limited visibility into controller-level firmware and configuration versions
Manual identification of controllers affected by vendor security advisories.
DCS changes avoided because their operational impact is uncertain
Informal patch decisions made independently by unit engineering
Limited cybersecurity involvement in DCS-level change decisions
Unclear DCS network boundaries and OPC bridge exposure
Difficulty determining which findings require immediate remediation
How Shieldworkz Solves Refinery DCS Cybersecurity Challenges
Shieldworkz provides an end-to-end OT security approach designed around the operational requirements of refinery DCS environments:
Controller-Level Asset Discovery: Firmware and configuration versions captured across the CDU and FCC DCS networks.
Vulnerability Assessment: Actual controller inventory baselined against vendor advisories and known platform issues.
Risk Prioritization: Findings ranked according to controller redundancy and unit criticality rather than treating every finding uniformly.
Joint Patch Assessment Process: A formal workflow established together with unit engineering for evaluating DCS changes.
Network Segmentation Review: DCS boundaries and OPC bridge exposure confirmed and documented.
Governance Framework: Shared ownership established between cybersecurity and unit engineering.
Continuous Monitoring: Ongoing visibility into the DCS network established for future security monitoring.
End-to-End Platform Capabilities
Controller-level asset visibility across CDU and FCC DCS networks
Firmware and configuration visibility to identify systems affected by vendor advisories
OT vulnerability assessment against current advisories and known platform issues
Risk-based prioritization based on controller redundancy and unit criticality
DCS network segmentation review covering DCS boundaries and OPC bridge exposure
Continuous DCS network monitoring for ongoing visibility
Vendor advisory tracking for repeatable assessment of future security notifications
The Business Value of Better Refinery DCS Security
A structured DCS security and lifecycle management process provides refinery teams with a more reliable way to respond to security advisories and make operationally informed decisions:
Controller-level firmware inventory established across both units for the first time.
The original vendor advisory assessed against actual inventory, with a documented decision for each affected controller.
A repeatable patch assessment process established between cybersecurity and unit engineering.
Findings ranked and documented according to unit criticality and controller redundancy.
DCS network segmentation and OPC bridge exposure confirmed and documented.
A defined process established for DCS lifecycle management, providing a clear response to compliance and process safety audit questions.
Secure Your Refinery DCS Environment
A DCS security advisory should not leave your refinery team asking which controllers are affected or relying on a default decision to avoid change.
Shieldworkz helps refinery operators establish controller-level visibility, assess vendor advisories against actual DCS inventory, prioritize findings based on unit criticality and redundancy, and create a repeatable patch assessment process shared between cybersecurity and unit engineering.
The objective is not simply to patch every controller. It is to establish a documented, risk-based decision process that supports refinery operations, process safety, and long-term DCS lifecycle management.
Schedule Your Free Consultation with Shieldworkz OT Security Experts
Get the Full Protecting Refinery Distributed Control Systems Use CaseUnderstand how a refinery established controller-level visibility across its CDU and FCC DCS networks, assessed a real vendor security advisory against its actual inventory, prioritized findings based on redundancy and unit criticality, and created a repeatable patch assessment workflow between cybersecurity and unit engineering.
Book Your Consultation Today!
Strengthen your DCS security with better controller visibility, risk-based patch assessment, and continuous monitoring. Book your OT security consultation with Shieldworkz today.
