ISO/SAE INTERNATIONAL STANDARD 21434 First edition 2021-08 Road vehicles - Cybersecurity engineering vehicules routiers - Ingenierie de la cybersécurite Referencenumber SAE ISO/SAE21434:2021(E) INTERNATIONAL IS0/SAEInternational2021 Copyrigh IS0/SAE21434:2021(E) COPYRIGHTPROTECTEDDOCUMENT ISO/SAE International 2021 All rights reserved.Unless otherwise specified, or required in the context of its implementation,nopart of this publication maybe reproduced, orutilized otherwise in anyform orby anymeans,electronic ormechanical, includingphotocopying,or postingontheinternetoranintranet,withoutpriorwrittenpermission.PermissioncanberequestedfromeitherIsOorSAE InternationalattherespectiveaddressbeloworIso'smemberbodyinthecountryoftherequester. ISO copyrightoffice SAEInternational CP401Ch.de Blandonnet 8 400CommonwealthDr. CH-1214 Vernier, Geneva Warrendale, PA,USA15096 Phone:+41227490111 Phone:877-606-7323(insideUSAandCanada) Phone:+1724-776-4970(outsideUSA) Email: [email protected] Fax: 724-776-0790 Website:www.iso.org Email:[email protected] Website:www.sae.org PublishedinSwitzerlandbyISO,published intheUSAbySAEInternational IS0/SAEInternational2021-Allrightsreserved IS0/SAE21434:2021(E） Foreword Iso (theInternationalOrganizationforStandardization)isaworldwidefederationofnational standards bodies (isO member bodies).The work of preparing International Standards is normally carried out through Iso technical committees.Each member body interested in a subject for which a technical committeehas been established has the right to be represented on that committee.International IsOcollaboratescloselywiththeInternationalElectrotechnicalCommission(IEC)onallmattersof electrotechnicalstandardization. SAE International is aglobal association ofmore than128,oo0 engineers andrelated technical experts intheaerospace,automotiveandcommercial-vehicleindustries.StandardsfromSAEInternational are used to advancemobility engineeringthroughout the world. The SAE Technical Standards Development Program isamong the organization's primaryprovisions tothose mobility industries it serves aerospace, automotive, and commercial vehicle. These works are authorized, revised, and maintained by the volunteer efforts of more than 9,oo engineers, and other qualified professionals fromaroundtheworld.SAEsubjectmatterexpertsactasindividualsinthestandardsprocess,not asrepresentatives of their organizations.Thus,SAE standards represent optimal technical content developedinatransparent,open,andcollaborativeprocess. The procedures used to develop this document and those intended for its further maintenance are described intheISO/IECDirectives,Part1andthe SAETechnical StandardsBoard Policy.Inparticular, the different approval criteria needed for the different types of Iso documents should be noted. This documentwasdraftedinaccordancewiththeeditorialrulesoftheIso/IEcDirectives,Part2(seewww org/directives) Attention is drawn to the possibility that some of the elements of this document may be the subject of patentrights.IsO andSAE International shall not beheld responsibleforidentifying any orall such patentrights. Details of anypatentrights identified during the development of the document will be in the Introductionand/oron theIso list of patent declarations received (see www.iso.org/patents) SAETechnical StandardsBoardRulesprovidethat:Thisdocumentispublishedtoadvancethestateof technical and engineering sciences.Theuse of this documentis entirelyvoluntary,and its applicability and suitabilityforanyparticularuse,includinganypatentinfringementarisingtherefrom,isthesole responsibilityoftheuser." Any trade name used in this document is information given for the convenience of users and does not constituteanendorsement. For an explanation of thevoluntary nature of standards, the meaning of Iso specific terms and expressions related to conformity assessment, as well as information about IsO's adherence to the World Trade Organization (WTO) principles in the Technical Barriers