ISO SAE 21434-2021 PDF

Full title and description

ISO/SAE 21434:2021 — Road vehicles — Cybersecurity engineering. An international technical standard jointly developed by the International Organization for Standardization (ISO) and SAE International that defines requirements and processes for cybersecurity risk management and engineering across the lifecycle of electrical/electronic (E/E) systems in road vehicles.

Abstract

ISO/SAE 21434:2021 establishes a structured, lifecycle-oriented framework for identifying, assessing and controlling cybersecurity risks for automotive E/E systems from concept and development through production, operation, maintenance and decommissioning. It specifies terminology, objectives, organizational and engineering requirements, threat-analysis and risk-assessment techniques, verification and validation activities, supplier management, incident response and information exchange practices to support a consistent industry approach to automotive cybersecurity.

General information

• Status: Published.
• Publication date: August 2021 (published 31 August 2021).
• Publisher: International Organization for Standardization (ISO), developed in collaboration with SAE International.
• ICS / categories: 43.040.15 (Car informatics / on-board computer systems).
• Edition / version: Edition 1 — ISO/SAE 21434:2021.
• Number of pages: 81 (official ISO document page count).

Scope

Applies to cybersecurity engineering for road vehicles and the E/E systems they contain. The scope covers organizational and technical measures needed to manage cybersecurity risk across the entire vehicle lifecycle (concept, development, production, operation, maintenance and decommissioning), and addresses interactions across the supply chain and with related engineering practices. It is technology‑agnostic and focuses on processes, risk management and evidence of cybersecurity activities.

Key topics and requirements

• Cybersecurity governance, policies and organizational roles (establishing responsibilities and processes).
• Threat analysis and risk assessment (TARA) to derive cybersecurity goals and requirements.
• Secure-by-design principles integrated into system and software development lifecycles.
• Specification of cybersecurity requirements for hardware, software and communication interfaces.
• Supplier and supply‑chain cybersecurity management and contractual flow-down of requirements.
• Verification, validation and cybersecurity testing throughout development and production.
• Incident response, vulnerability handling and post‑production security management (monitoring, updates, decommissioning).
• Interfaces and alignment with functional safety (e.g., ISO 26262) and other management systems.

Typical use and users

Used by automotive OEMs, Tier‑1 and Tier‑2 suppliers, cybersecurity engineers, systems and software architects, compliance and regulatory teams, product managers, and auditors. It is applied by organizations designing, developing, integrating or maintaining vehicle E/E systems to demonstrate that cybersecurity risk has been systematically managed.

Related standards

Closely related to and commonly used alongside: UNECE WP.29 (regulatory requirements such as UN R155 on cybersecurity and software updates), ISO 26262 (functional safety), SAE J3061 (earlier cybersecurity guidebook that informed 21434), ISO 24089 (software aspects for road vehicles) and general information-security standards such as ISO/IEC 27001 where organizational controls overlap.

Keywords

automotive cybersecurity, road vehicle security, cybersecurity engineering, TARA, threat analysis, risk assessment, secure-by-design, supplier management, incident response, ISO/SAE 21434:2021.

FAQ

Q: What is this standard?

A: ISO/SAE 21434:2021 is an international standard titled "Road vehicles — Cybersecurity engineering" that defines engineering and management requirements to address cybersecurity risks in vehicle electrical/electronic systems.

Q: What does it cover?

A: It covers cybersecurity governance, threat analysis and risk assessment, requirements engineering, secure design and implementation, verification and validation, supplier control, and post‑production activities such as vulnerability handling and incident response across the vehicle lifecycle.

Q: Who typically uses it?

A: Automotive OEMs, suppliers, cybersecurity and systems engineers, product and program managers, regulatory and compliance teams, and assessors use the standard to plan, execute and document cybersecurity engineering activities.

Q: Is it current or superseded?

A: ISO/SAE 21434:2021 is the current published edition (first edition, 2021). It builds on and supersedes guidance from SAE J3061 by providing a formal international standard for automotive cybersecurity. Users should monitor ISO/SAE and national bodies for any future amendments or corrigenda.

Q: Is it part of a series?

A: While not a numeric "series", ISO/SAE 21434 is commonly used together with standards addressing related domains—most notably ISO 26262 (functional safety), ISO 24089 (software aspects for road vehicles) and regulatory frameworks such as UNECE WP.29 / UN R155—forming the broader compliance and engineering ecosystem for automotive safety, security and software management.

Q: What are the key keywords?

A: Automotive cybersecurity, cybersecurity engineering, TARA, risk assessment, supplier management, secure-by-design, incident response, vehicle E/E systems.