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Exam Code: ISA-IEC-62443-IC37M
Exam Name: ISA/IEC 62443 Cybersecurity Maintenance Specialist (Certificate 4)
Number of Questions: 75
Time Allotted: 3 hours
Passing Marks: 70%

Ongoing Operations and Maintenance Activities
- Establish and implement IACS security program per ISA/IEC 62443-2-1, including risk reduction to tolerable levels.
- Conduct regular audits, reviews, and continual improvement of security policies and procedures.
- Integrate cybersecurity into daily operations, ensuring alignment with asset owner responsibilities.
- Monitor IACS performance metrics for security effectiveness, including SL-C (Capability) and SL-T (Target) levels.

Secure Maintenance Principles
- Apply defense-in-depth strategies and zones/conduits concepts from ISA/IEC 62443-1-1 during maintenance.
- Enforce access controls, authentication, and encryption for maintenance activities (FR 1, 2 from 62443-3-3).
- Document maintenance procedures to maintain system integrity and confidentiality.
- Train personnel on secure practices, avoiding unauthorized changes or disruptions.

System Updates and Patching
- Develop patch management process per ISA/IEC 62443-2-3, prioritizing critical vulnerabilities.
- Test patches in isolated environments before deployment to minimize operational impact.
- Schedule updates during maintenance windows, with rollback plans for failures.
- Track patch compliance and integrate with vendor notifications for timely application.

Threat Monitoring and Detection
- Deploy tools for continuous monitoring of IACS networks (e.g., intrusion detection per 62443-3-1).
- Analyze logs and anomalies for early threat identification, using SIEM systems adapted for OT.
- Establish baselines for normal behavior to detect deviations.
- Report and escalate detected threats per incident classification guidelines.

Vulnerability Management
- Perform periodic vulnerability exams and scans on IACS components (aligned with 62443-2-1 requirements).
- Prioritize vulnerabilities based on risk (CVSS scores, exploitability in OT environments).
- Remediate through patching, configuration hardening, or segmentation.
- Maintain vulnerability inventory and track resolution timelines.

Incident Response and Recovery
- Develop IR plan per ISA/IEC 62443-2-1, including detection, containment, eradication, and recovery phases.
- Define roles for response team, communication protocols, and post-incident reviews.
- Test IR plans via tabletop exercises and simulations tailored to IACS scenarios.
- Ensure business continuity with backups and failover mechanisms for critical systems.

Roles and Responsibilities
- Asset Owner: Overall security program leadership, risk acceptance, resource allocation (62443-2-1).
- Maintenance Service Provider: Secure integration/maintenance services, compliance with SL requirements (62443-2-4).
- Security Practitioner: Implement monitoring, vulnerability management, and IR execution.
- Product Supplier: Provide secure updates and support documentation for ongoing maintenance (62443-4 series).