Security for industrial automation and control systems - Part 3-2: Security risk assessment and system design (IEC 62443-3-2:2020)

This part of IEC 62443 establishes requirements for:
• defining a system under consideration (SUC) for an industrial automation and control
system (IACS);
• partitioning the SUC into zones and conduits;
• assessing risk for each zone and conduit;
• establishing the target security level (SL-T) for each zone and conduit; and
• documenting the security requirements.

IT-Sicherheit für industrielle Automatisierungssysteme - Teil 3-2: Sicherheitsrisikobeurteilung und Systemgestaltung (IEC 62443-3-2:2020)

Sécurité des systèmes d'automatisation et de commande industriels - Partie 3-2: Évaluation des risques de sécurité pour la conception des systèmes (IEC 62443-3-2:2020)

L’IEC 62443-3-2:2020 établit les exigences concernant: • la définition d'un système à l'étude (SUC, system under consideration) pour un système d'automatisation et de commande industriel (IACS); • la division du SUC en zones et conduits; • l'appréciation du risque pour chaque zone et conduit; • l'établissement d'un niveau de sécurité cible (SL-T) pour chaque zone et conduit; et • la documentation des exigences de sécurité.

Zaščita sistemov industrijske avtomatizacije in nadzora - 3-2. del: Ocena varnostnega tveganja in načrtovanje sistema (IEC 62443-3-2:2020)

General Information

Status
Published
Publication Date
05-Nov-2020
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
09-Sep-2020
Due Date
14-Nov-2020
Completion Date
06-Nov-2020

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SLOVENSKI STANDARD
SIST EN IEC 62443-3-2:2020
01-december-2020
Zaščita sistemov industrijske avtomatizacije in nadzora - 3-2. del: Ocena
varnostnega tveganja in načrtovanje sistema (IEC 62443-3-2:2020)
Security for industrial automation and control systems - Part 3-2: Security risk
assessment and system design (IEC 62443-3-2:2020)
IT-Sicherheit für industrielle Automatisierungssysteme - Teil 3-2:
Sicherheitsrisikobeurteilung und Systemgestaltung (IEC 62443-3-2:2020)
Sécurité des systèmes d'automatisation et de commande industriels - Partie 3-2:
Évaluation des risques de sécurité pour la conception des systèmes (IEC 62443-3-
2:2020)
Ta slovenski standard je istoveten z: EN IEC 62443-3-2:2020
ICS:
25.040.01 Sistemi za avtomatizacijo v Industrial automation
industriji na splošno systems in general
35.030 Informacijska varnost IT Security
SIST EN IEC 62443-3-2:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 62443-3-2:2020
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SIST EN IEC 62443-3-2:2020
EUROPEAN STANDARD EN IEC 62443-3-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2020
ICS 25.040.40; 35.030
English Version
Security for industrial automation and control systems - Part 3-2:
Security risk assessment for system design
(IEC 62443-3-2:2020)

Sécurité des systèmes d'automatisation et de commande IT-Sicherheit für industrielle Automatisierungssysteme - Teil

industriels - Partie 3-2: Évaluation des risques de sécurité 3-2: Sicherheitsrisikobeurteilung und Systemgestaltung

pour la conception des systèmes (IEC 62443-3-2:2020)
(IEC 62443-3-2:2020)

This European Standard was approved by CENELEC on 2020-07-29. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 62443-3-2:2020 E
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SIST EN IEC 62443-3-2:2020
EN IEC 62443-3-2:2020 (E)
European foreword

The text of document 65/799/FDIS, future edition 1 of IEC 62443-3-2, prepared by IEC/TC 65

"Industrial-process measurement, control and automation" was submitted to the IEC-CENELEC

parallel vote and approved by CENELEC as EN IEC 62443-3-2:2020.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2021-04-29

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2023-07-29

document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 62443-3-2:2020 was approved by CENELEC as a

European Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards

indicated:
IEC 62443-2-1 NOTE Harmonized as EN IEC 62443-2-1
IEC 62443-2-4:2015 NOTE Harmonized as EN IEC 62443-2-4:2019 (not modified)
IEC 62443-4-1:2018 NOTE Harmonized as EN IEC 62443-4-1:2018 (not modified)
IEC 62443-4-2:2019 NOTE Harmonized as EN IEC 62443-4-2:2019 (not modified)
IEC 61511-2:2016 NOTE Harmonized as EN 61511-2:2017 (not modified)
IEC 62264-1:2013 NOTE Harmonized as EN 62264-1:2013 (not modified)
To be published. Stage at the time of publication: prEN IEC 62443-2-1:2019.
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SIST EN IEC 62443-3-2:2020
EN IEC 62443-3-2:2020 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year

IEC 62443-3-3 2013 Industrial communication networks - Network EN IEC 62443-3-3 2019

and system security - Part 3-3: System
security requirements and security levels
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SIST EN IEC 62443-3-2:2020
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SIST EN IEC 62443-3-2:2020
IEC 62443-3-2
Edition 1.0 2020-06
INTERNATIONAL
STANDARD
colour
inside
Security for industrial automation and control systems –
Part 3-2: Security risk assessment for system design
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.040.40; 35.030 ISBN 978-2-8322-8501-5

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
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SIST EN IEC 62443-3-2:2020
– 2 – IEC 62443-3-2:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms, definitions, abbreviated terms, acronyms and conventions ................................... 7

3.1 Terms and definitions .............................................................................................. 7

3.2 Abbreviated terms and acronyms .......................................................................... 10

3.3 Conventions .......................................................................................................... 11

4 Zone, conduit and risk assessment requirements ........................................................... 11

4.1 Overview............................................................................................................... 11

4.2 ZCR 1: Identify the SUC ........................................................................................ 13

4.2.1 ZCR 1.1: Identify the SUC perimeter and access points ................................. 13

4.3 ZCR 2: Initial cyber security risk assessment ........................................................ 13

4.3.1 ZCR 2.1: Perform initial cyber security risk assessment ................................. 13

4.4 ZCR 3: Partition the SUC into zones and conduits ................................................ 14

4.4.1 Overview ....................................................................................................... 14

4.4.2 ZCR 3.1: Establish zones and conduits .......................................................... 14

4.4.3 ZCR 3.2: Separate business and IACS assets ............................................... 14

4.4.4 ZCR 3.3: Separate safety related assets ........................................................ 14

4.4.5 ZCR 3.4: Separate temporarily connected devices ......................................... 15

4.4.6 ZCR 3.5: Separate wireless devices .............................................................. 15

4.4.7 ZCR 3.6: Separate devices connected via external networks ......................... 15

4.5 ZCR 4: Risk comparison ....................................................................................... 16

4.5.1 Overview ....................................................................................................... 16

4.5.2 ZCR 4.1: Compare initial risk to tolerable risk ................................................ 16

4.6 ZCR 5: Perform a detailed cyber security risk assessment .................................... 16

4.6.1 Overview ....................................................................................................... 16

4.6.2 ZCR 5.1: Identify threats ................................................................................ 17

4.6.3 ZCR 5.2: Identify vulnerabilities ..................................................................... 18

4.6.4 ZCR 5.3: Determine consequence and impact ............................................... 18

4.6.5 ZCR 5.4: Determine unmitigated likelihood .................................................... 19

4.6.6 ZCR 5.5: Determine unmitigated cyber security risk ....................................... 19

4.6.7 ZCR 5.6: Determine SL-T .............................................................................. 19

4.6.8 ZCR 5.7: Compare unmitigated risk with tolerable risk ................................... 20

4.6.9 ZCR 5.8: Identify and evaluate existing countermeasures .............................. 20

4.6.10 ZCR 5.9: Reevaluate likelihood and impact .................................................... 20

4.6.11 ZCR 5.10: Determine residual risk ................................................................. 21

4.6.12 ZCR 5.11: Compare residual risk with tolerable risk ....................................... 21

4.6.13 ZCR 5.12: Identify additional cyber security countermeasures ....................... 21

4.6.14 ZCR 5.13: Document and communicate results .............................................. 22

4.7 ZCR 6: Document cyber security requirements, assumptions and constraints ....... 22

4.7.1 Overview ....................................................................................................... 22

4.7.2 ZCR 6.1: Cyber security requirements specification ....................................... 22

4.7.3 ZCR 6.2: SUC description .............................................................................. 23

4.7.4 ZCR 6.3: Zone and conduit drawings ............................................................. 23

4.7.5 ZCR 6.4: Zone and conduit characteristics..................................................... 23

4.7.6 ZCR 6.5: Operating environment assumptions ............................................... 24

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4.7.7 ZCR 6.6: Threat environment ......................................................................... 25

4.7.8 ZCR 6.7: Organizational security policies ...................................................... 25

4.7.9 ZCR 6.8: Tolerable risk .................................................................................. 25

4.7.10 ZCR 6.9: Regulatory requirements ................................................................. 26

4.8 ZCR 7: Asset owner approval ................................................................................ 26

4.8.1 Overview ....................................................................................................... 26

4.8.2 ZCR 7.1: Attain asset owner approval ............................................................ 26

Annex A (informative) Security levels ................................................................................... 27

Annex B (informative) Risk matrices .................................................................................... 28

Bibliography .......................................................................................................................... 31

Figure 1 – Workflow diagram outlining the primary steps required to establish zones

and conduits, as well as to assess risk ................................................................................. 12

Figure 2 – Detailed cyber security risk assessment workflow per zone or conduit ................. 17

Table B.1 – Example of a 3 x 5 risk matrix ............................................................................ 28

Table B.2 – Example of likelihood scale ................................................................................ 28

Table B.3 – Example of consequence or severity scale ......................................................... 29

Table B.4 – Example of a simple 3 x 3 risk matrix ................................................................. 29

Table B.5 – Example of a 5 x 5 risk matrix ............................................................................ 30

Table B.6 – Example of a 3 x 4 matrix ................................................................................... 30

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SIST EN IEC 62443-3-2:2020
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SECURITY FOR INDUSTRIAL AUTOMATION AND CONTROL SYSTEMS –
Part 3-2: Security risk assessment for system design
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

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expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 62443-3‑2 has been prepared by IEC technical committee 65:

Industrial-process measurement, control and automation.
The text of this standard is based on the following documents:
FDIS Report on voting
65/799/FDIS 65/804/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 62443 series, published under the general title Security for

industrial automation and control systems, can be found on the IEC website.
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SIST EN IEC 62443-3-2:2020
IEC 62443-3-2:2020 © IEC 2020 – 5 –

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
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SIST EN IEC 62443-3-2:2020
– 6 – IEC 62443-3-2:2020 © IEC 2020
INTRODUCTION

There is no simple recipe for how to secure an industrial automation and control system (IACS)

and there is good reason for this. It is because security is a matter of risk management. Every

IACS presents a different risk to the organization depending upon the threats it is exposed to,

the likelihood of those threats arising, the inherent vulnerabilities in the system and the

consequences if the system were to be compromised. Furthermore, every organization that

owns and operates an IACS has a different tolerance for risk.

This document strives to define a set of engineering measures that will guide an organization

through the process of assessing the risk of a particular IACS and identifying and applying

security countermeasures to reduce that risk to tolerable levels.

A key concept in this document is the application of IACS security zones and conduits. Zones

and conduits are introduced in IEC TS 62443-1-1.

This document has been developed in cooperation with the ISA99 liaison. ISA99 is the

committee on Industrial Automation and Control Systems Security of the International Society

of Automation (ISA).

The audience for this document is intended to include the asset owner, system integrator,

product supplier, service provider, and compliance authority.

This document provides a basis for specifying security countermeasures by aligning the target

security levels (SL-Ts) identified in this document with the required capability security levels

(SL-Cs) specified in IEC 62443-3-3.
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SIST EN IEC 62443-3-2:2020
IEC 62443-3-2:2020 © IEC 2020 – 7 –
SECURITY FOR INDUSTRIAL AUTOMATION AND CONTROL SYSTEMS –
Part 3-2: Security risk assessment for system design
1 Scope
This part of IEC 62443 establishes requirements for:

• defining a system under consideration (SUC) for an industrial automation and control

system (IACS);
• partitioning the SUC into zones and conduits;
• assessing risk for each zone and conduit;
• establishing the target security level (SL-T) for each zone and conduit; and
• documenting the security requirements.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.

IEC 62443-3-3:2013, Industrial communication networks – Network and system security –

Part 3-3: System security requirements and security levels
3 Terms, definitions, abbreviated terms, acronyms and conventions
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• ISO Online browsing platform: available at https://www.iso.org/obp
• IEC Electropedia: available at http://www.electropedia.org/
3.1.1
channel
specific logical or physical communication link between assets
Note 1 to entry: A channel facilitates the establishment of a connection.
3.1.2
compliance authority

entity with jurisdiction to determine the adequacy of a security assessment or the

effectiveness of implementation as specified in a governing document

Note 1 to entry: Examples of compliance authorities include government agencies, regulators, external and

internal auditors.
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3.1.3
conduit

logical grouping of communication channels that share common security requirements

connecting two or more zones
3.1.4
confidentiality

preservation of authorized restrictions on information access and disclosure, including means

for protecting personal privacy and proprietary information
3.1.5
consequence

result of an incident, usually described in terms of health and safety effects, environmental

impacts, loss of property, loss of information (for example, intellectual property), and/or

business interruption costs, that occurs from a particular incident
3.1.6
countermeasure

action, device, procedure, or technique that reduces a threat, a vulnerability, or the

consequences of an attack by eliminating or preventing it, by minimizing the harm it can

cause, or by discovering and reporting it so that corrective action can be taken

Note 1 to entry: The term “control” is also used to describe this concept in some contexts. The term

countermeasure has been chosen for this document to avoid confusion with the word control in the context of

“process control.”
3.1.7
cyber security

measures taken to protect a computer or computer system against unauthorized access or

attack
Note 1 to entry: IACS are computer systems.
3.1.8
dataflow

movement of data through a system comprised of software, hardware, or a combination of

both
3.1.9
external network
network that is connected to the SUC that is not part of the SUC
3.1.10
impact
measure of the ultimate loss or harm associated with a consequence

EXAMPLE: The consequence of the incident was a spill. The impact of the spill was a $100 000 fine and $25 000

in clean-up expenses.

Note 1 to entry: Impact may be expressed in terms of numbers of injuries and/or fatalities, extent of

environmental damage and/or magnitude of losses such as property damage, material loss, loss of intellectual

property, lost production, market share loss, and recovery costs.
3.1.11
likelihood
chance of something happening

Note 1 to entry: In risk management terminology, the word “likelihood” is used to refer to the chance of something

happening, whether defined, measured or determined objectively or subjectively, qualitatively or quantitatively, and

described using general terms or mathematically (such as a probability or a frequency over a given time period).

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Note 2 to entry: A number of factors are considered when estimating likelihood in information system risk

management such as the motivation and capability of the threat source, the history of similar threats, known

vulnerabilities, the attractiveness of the target, etc.
[SOURCE: ISO Guide 73:2009 [13] , 3.6.1.1 and ISO/IEC 27005:2018 [12], 3.7]
3.1.12
process hazard analysis

set of organized and systematic assessments of the potential hazards associated with an

industrial process
3.1.13
residual risk

risk that remains after existing countermeasures are implemented (such as, the net risk or risk

after countermeasures are applied)
3.1.14
risk

expectation of loss expressed as the likelihood that a particular threat will exploit a particular

vulnerability with a particular consequence
3.1.15
security level

measure of confidence that the SUC, security zone or conduit is free from vulnerabilities and

functions in the intended manner
3.1.16
security perimeter

logical or physical boundary surrounding all the assets that are controlled and protected by

the security zone
3.1.17
system under consideration
SUC

defined collection of IACS assets that are needed to provide a complete automation solution,

including any relevant network infrastructure assets

Note 1 to entry: An SUC consists of one or more zones and related conduits. All assets within a SUC belong to

either a zone or conduit.
3.1.18
threat

circumstance or event with the potential to adversely impact organizational operations

(including mission, functions, image or reputation) and/or organizational assets including

IACS

Note 1 to entry: Circumstances include individuals who, contrary to security policy, intentionally or unintentionally

prevent access to data or cause the destruction, disclosure, or modification of data such as control

logic/parameters, protection logic/parameters or diagnostics.
3.1.19
threat environment

summary of information about threats, such as threat sources, threat vectors and trends, that

have the potential to adversely impact a defined target (for example, company, facility or SUC)

_______________
Numbers in square brackets refer to the bibliography.
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3.1.20
threat source

intent and method targeted at the intentional exploitation of a vulnerability or a situation and

method that can accidentally exploit a vulnerability
3.1.21
threat vector
path or means by which a threat source can gain access to an asset
3.1.22
tolerable risk
level of risk deemed acceptable to an organization

Note 1 to entry: Organizations should include consideration of legal requirements when establishing tolerable risk.

Additional guidance on establishing tolerable risk can be found in ISO 31000 [14] and NIST 800-39 [16].

3.1.23
unmitigated cyber security risk

level of cyber security risk that is present in a system before any cyber security

countermeasures are considered

Note 1 to entry: This level helps identify how much cyber security risk reduction is required to be provided by any

countermeasure.
3.1.24
vulnerability

flaw or weakness in a system's design, implementation or operation and management that

could be exploited to violate the system's integrity or security policy
3.1.25
zone

grouping of logical or physical assets based upon risk or other criteria, such as criticality of

assets, operational function, physical or logical location, required access (for example, least

privilege principles) or responsible organization

Note 1 to entry: Collection of logical or physical assets that represents partitioning of a system under

consideration on the basis of their common security requirements, criticality (for example, high financial, health,

safety, or environmental impact), functionality, logical and physical (including location) relationship.

3.2 Abbreviated terms and acronyms
The list below defines the abbreviated terms and acronyms used in this document.
ANSI American National Standards Institute
BPCS Basic process control system
CERT Computer emergency response team
CRS Cyber security requirements specification
DCS Distributed control system
HMI Human machine interface
...

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