IEC 62443 is a comprehensive series of international cyber security standards developed specifically for industrial automation and control systems (IACS) and operational technology (OT) environments.
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The standards provide a recognised framework for securing critical systems and services while supporting a structured and repeatable approach to cyber security management.
Overcyte helps organisations operationalise IEC 62443 by bringing assessments, risks, controls, evidence, remediation activities, and reporting together within a single platform.
Through its contextualised risk management capabilities, organisations can align IEC 62443 requirements to critical assets, operational processes, and business objectives, providing greater visibility of cyber risk and implementation priorities.
Overcyte's Controls Library enables organisations to manage IEC 62443 controls, maintain supporting evidence, track control effectiveness, and demonstrate progress over time, supporting both implementation activities and continuous improvement programmes.
The standards provide a structured approach to securing industrial systems throughout their lifecycle, covering governance, risk management, system architecture, technical controls, secure development practices, and ongoing operations.
Designed to address the unique challenges of industrial environments, IEC 62443 bridges the gap between operational technology, information technology, and process safety.
It enables organisations to establish consistent security practices, assess cyber security capabilities, manage risk, and implement security requirements appropriate to their operational environment.
IEC 62443 is widely adopted across critical infrastructure and industrial sectors including energy, utilities, manufacturing, transportation, healthcare, building automation, and oil and gas.
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The IEC 62443 series is a collection of standards that address cyber security for industrial automation and control systems (IACS). The standards are organised into four categories, each focusing on a different aspect of securing industrial environments.
The IEC 62443-1 standards provide an overview of the series and define the terminology, concepts, models, and principles used throughout the framework.
These standards establish the foundation for understanding and applying IEC 62443.
The IEC 62443-2 standards focus on cyber security management systems, policies, procedures, and operational practices. They define requirements for asset owners, operators, and service providers responsible for managing cyber security within industrial environments.
IEC 62443-2-4 specifies security programme requirements for IACS service providers, including the security capabilities and practices expected during the integration and maintenance of automation solutions.
The IEC 62443-3 standards address security at the system level. They provide requirements and guidance for risk assessment, system design, and the implementation of security measures within industrial automation and control systems.
IEC 62443-3-3 defines detailed system security requirements and establishes four Security Levels (SL 1 to SL 4) used to assess the security capability of a control system.
The IEC 62443-4 standards focus on individual components used in industrial control systems. They define requirements for product development processes and technical security capabilities.
IEC 62443-4-1 specifies secure development lifecycle requirements for IACS products, including design, implementation, verification, patch management, and product end-of-life.
IEC 62443-4-2 defines technical security requirements for IACS components, including embedded devices, network devices, host systems, and software applications.
IEC 62443 defines four Security Levels (SL1–SL4) that describe the security capability of a system or component against different types of cyber threats.
Security Levels are used to determine the level of protection required for industrial automation and control systems based on identified risks and security objectives.
- SL1 – Protection against accidental or coincidental events.
- SL2 – Protection against intentional violations using simple means.
- SL3 – Protection against intentional violations using sophisticated means.
- SL4 – Protection against intentional violations using sophisticated means with extended resources.
Security Levels are applied to systems and components and provide a consistent method for defining and assessing security requirements within industrial environments.
IEC 62443-4-1 defines four Maturity Levels (ML1–ML4) that are used to assess the maturity of a supplier's secure development lifecycle processes. Unlike Security Levels, which focus on the security capability of a product or system, Maturity Levels assess the processes used to design, develop, maintain, and support those products.
- ML1 – Processes are performed.
- ML2 – Processes are documented and managed.
- ML3 – Processes are established and consistently applied across the organisation.
- ML4 – Processes are measured and continuously improved.
Maturity Levels provide a framework for evaluating the effectiveness and consistency of security practices throughout the product development lifecycle.
IEC 62443 defines seven Foundational Requirements that form the basis for system security requirements within industrial automation and control systems. These requirements are used throughout the standard to define security objectives and support the achievement of Security Levels.
The seven Foundational Requirements are:
- Identification and Authentication Control (IAC) – Requirements for identifying and authenticating users, devices, and software processes.
- Use Control (UC) – Requirements for managing permissions and authorised access.
- System Integrity (SI) – Requirements for protecting systems from unauthorised modification.
- Data Confidentiality (DC) – Requirements for protecting information from unauthorised disclosure.
- Restricted Data Flow (RDF) – Requirements for controlling communications between systems, zones, and networks.
- Timely Response to Events (TRE) – Requirements for detecting, reporting, and responding to security events.
- Resource Availability (RA) – Requirements for maintaining the availability of systems and services.
Together, these foundational requirements provide a structured basis for defining, implementing, and assessing cyber security controls within industrial and operational technology environments.
IEC 62443 includes a number of certification schemes that assess conformance with specific requirements within the standard series. These certifications may apply to product development processes, individual components, integrated systems, or operational environments.Within the IEC 62443 framework, Maturity Levels (ML1–ML4) are used to assess secure development lifecycle processes, while Security Levels (SL1–SL4) are used to assess the security capability of systems and components.
IEC 62443 provides a comprehensive framework for addressing cyber security within industrial automation and control systems (IACS). The series establishes requirements and guidance for asset owners, operators, system integrators, service providers, and product suppliers, enabling a consistent approach to managing cyber security risks across industrial environments.
The standards address multiple aspects of industrial cyber security, including governance, risk management, system design, secure development practices, technical controls, system integration, and ongoing operations.
IEC 62443 defines security requirements for systems, components, and processes used within industrial automation and control environments.
The standards provide guidance for implementing security controls across the lifecycle of industrial systems, from design and deployment through to operation, maintenance, and retirement.
The series covers areas such as identification and authentication, access control, system integrity, data confidentiality, network segmentation, event monitoring, and resource availability.
By establishing a common set of security requirements and terminology, IEC 62443 provides a structured basis for assessing security capabilities and implementing cyber security measures within industrial environments.
IEC 62443 has been developed specifically for industrial and operational technology environments where system availability, reliability, and safety are important considerations.
The standards address the design, implementation, operation, and maintenance of secure industrial systems while recognising the operational requirements of industrial processes.
The framework supports a defence-in-depth approach to security and includes requirements relating to system architecture, zones and conduits, risk assessments, security management processes, and incident response capabilities.
These requirements provide organisations with a structured approach for managing cyber security risks throughout the lifecycle of industrial systems.
IEC 62443 is an internationally recognised series of standards that is used across a range of sectors, including manufacturing, energy, utilities, transportation, building automation, oil and gas, and other industries that rely on industrial automation and control systems.
The standards provide a common framework that can be used to support cyber security programmes, supplier assurance activities, procurement requirements, system development projects, and security assessments.
Organisations may also use IEC 62443 as a reference point when addressing industry-specific obligations, contractual requirements, or regulatory expectations relating to industrial cyber security.
By providing a recognised set of requirements and assessment criteria, IEC 62443 enables organisations to establish a consistent and repeatable approach to securing industrial automation and control systems.
Overcyte provides a structured platform for managing IEC 62443 implementation activities and supporting continuous cyber security improvement across industrial automation and control systems (IACS) and operational technology (OT) environments. The platform enables organisations to assess current capabilities, identify gaps, document evidence, manage remediation activities, and monitor progress against IEC 62443 requirements over time.
At the core of the platform is a contextualised risk management capability that helps organisations understand how IEC 62443 requirements relate to their specific operational environment. Rather than treating compliance activities as a checklist exercise, Overcyte enables organisations to link cyber security risks to critical systems, operational processes, assets, and business outcomes. This provides greater visibility of risk exposure and supports more informed prioritisation of remediation activities.
Overcyte's Controls Library provides a central repository for managing IEC 62443 controls and associated evidence. Controls can be mapped to risks, assessments, remediation actions, and supporting documentation, creating traceability between requirements, implementation activities, and risk outcomes. This helps organisations maintain visibility of control effectiveness and demonstrate progress over time.
The platform also supports continuous improvement by enabling organisations to track risk reduction, monitor remediation programmes, reassess capabilities, and report on implementation progress. By bringing together assessments, risks, controls, actions, and reporting within a single platform, Overcyte provides a structured and repeatable approach to managing IEC 62443 implementation activities throughout the lifecycle of industrial systems.
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