> iec_62443-2-4:2015+amd1:2017
IEC 62443-2-4:2015+AMD1:2017
Security for Industrial Automation and Control Systems — Part 2-4: Security Program Requirements for IACS Service Providers
IEC 62443-2-4 defines requirements for external vendors, system integrators, and maintenance service providers operating on industrial automation systems. It governs secure integration practices, remote access procedures, patch distribution controls, field technician credential hygiene, and vendor sub-supplier risks.
Scope & Applicability
Applies to automation vendors, engineering contractors, and third-party maintenance providers servicing plant OT systems.
Non-Coverage Boundaries
Does not define the asset owner's internal plant operating procedures (governed by 2-1) or component hardware certifications (governed by 4-2).
Key Clauses & Control Requirements
Service Provider Remote Access Controls
Mandates isolated jump hosts, multifactor authentication, explicit owner authorization, and full session recording for all vendor remote sessions.
Required Regulatory & Audit Evidence Artifacts
- [✓]Vendor IEC 62443-2-4 Service Provider Conformity Certification
- [✓]Vendor Remote Access Approval and Recorded Session Logs
- [✓]Factory Acceptance Testing (FAT) / Site Acceptance Testing (SAT) Cybersecurity Checklists
“Third-party vendor remote access is the number one entry vector for industrial ransomware. Never grant standing, unmonitored VPN access to external automation vendors.”
Cross-Surface Ecosystem Relationships
- IEC 62443-2-4:2015 Security program requirements for IACS service providers ↗(International Electrotechnical Commission)
Frequently Asked Questions
Why should a utility mandate IEC 62443-2-4 compliance in supplier RFPs?
To contractually enforce that vendors use secure programming tools, vet their field engineers, and adhere to strict remote-access boundaries when maintaining critical control systems.