ISO/IEC 27005 InfoSec Risk Management

ISO/IEC 27005 Information Security Risk Management

Risk assessment (commonly referred to as risk analysis) is likely the most difficult component of ISO 27001 implementation; nevertheless, risk assessment is the most critical phase at the start of your information security initiative. It lays the groundwork for information security in your organisation. Risk management is often overcomplicated. This is where ISO 27005 comes in.


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What is ISO 27005?

ISO 27005 is an international standard that outlines the procedures for conducting an information security risk assessment in compliance with ISO 27001. As previously said, risk assessments are a critical component of an organisation’s ISO 27001 compliance initiative. ISO 27001 allows you to show proof of risk assessment for information security risk management, measures taken, and the application of applicable controls from Annex A.

  • ISO 27005 guidelines are a subset of a broader range of best practices for preventing data breaches in your organisation.
  • The specification provides guidance on the formal identification, assessment, evaluation, and treatment of information security vulnerabilities – procedures that are central to an ISO27k Information Security Management System (ISMS).
  • Its objective is to ensure that organisations rationally plan, execute, administer, monitor, and manage their information security controls and other arrangements in relation to their information security risks.
  • As with the other standards in the series, ISO 27005 does not define a clear path to compliance. It simply recommends best practices that will fit into any standard ISMS.
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What is Information Security Risk Management?

ISRM, or information security risk management, is the practice of identifying and mitigating risks related to the use of information technology. It entails identifying, assessing, and mitigating threats to an organisation’s confidentiality, reputation, and availability of assets. This end result is to manage risks in line with an organisation’s overall risk tolerance. Businesses do not expect to eradicate all risks; rather, they should strive to define and maintain a risk level that is appropriate to their company.

  1. ISO 27005 and Information Security Risk Management

    While risk management best practices have evolved over time to address individual needs in a variety of areas and industries through the use of a variety of different methods, the implementation of consistent processes within an overarching framework can help ensure that risks are handled reliably, accurately, and intelligibly within the organisation. ISO 27005 specifies these standardised frameworks. ISO 27005 defines risk management best practices that are tailored primarily for information security risk management, with a special emphasis on conforming to the standards of an Information Security Management System (ISMS), as required by ISO/IEC 27001.

    It specifies that risk management best practices should be established in compliance with the organisation’s characteristics, taking into account the complexity of the organisation’s information security management system, the risk management scope, and the industry. Although ISO 27005 does not define a particular risk management approach, it does support a continuous risk management approach based on six critical components:

    Context Establishment

    The risk assessment context establishes the guidelines for identifying risks, determining who is accountable for risk ownership, determining how risks affect the confidentiality, integrity, and availability of information, and calculating risk effect and probability.

  2. Information Security Risk Acceptance

    Organisations should establish their own risk acceptance requirements that take into account current strategies, priorities, targets, and shareholder interests. This means documenting everything. Not just for the auditors, but so that you can refer to them in the future if need be.

  3. Information Security Risk Monitoring and Review

    Risks are dynamic and can change rapidly. As a result, they should be actively monitored in order to detect shifts easily and maintain a complete picture of the risks. Additionally, organisations should keep a close watch on the following: Any new assets brought into the domain of risk management; Asset values that need to be adjusted to reflect changing business requirements; New risks, external or internal, that have not yet been evaluated; and incidents involving information security.

  4. Information Security Risk Communication

    Effective risk communication and consulting are critical components of the information security risk management process. It guarantees that people responsible for risk management grasp the rationale for decisions and the reasons for such actions. Sharing and exchanging ideas about risk also helps policymakers and other stakeholders reach a consensus on how to handle risk. Continuous risk communication should be practised, and organisations should establish risk communication strategies for both routine procedures and emergency situations.

Information Security Risk Assessment (ISRA)

Assessing information security risk can be a difficult process, but once you know what to look out for, you will begin to discover the possible issues that can occur. To properly access the risk, you must first list all of your assets and then risks and vulnerabilities relevant to those assets, noting the level of potential risk. Some organisations opt for a five-stage asset-based risk assessment approach.

  1. Creating a database of information assets
  2. Determining the risks and vulnerabilities that each asset faces
  3. Assigning values to the effect and probability of occurrence in accordance with risk parameters
  4. Comparing each vulnerability to predefined acceptability thresholds
  5. Determining which threats should be tackled first and in what order

Information Security Risk Treatment

Everyone knows that risks are not created equal. So, the best way to treat risk is to start with the unacceptable risks – the ones that pose the most problems. Risks can be treated in one of four ways:

  1. ‘Avoid’ the possibility by completely removing it.
  2. ‘Modify’ the vulnerability by the use of security measures.
  3. Assign risk to a third party (through insurance or outsourcing).
  4. ‘Retain’ the risk (if the risk falls within established risk acceptance criteria).

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What is the Scope and Purpose of ISO 27005?

The ISO/IEC 27000 set of guidelines apply to all types and sizes of organisations – a very dynamic category, which is why it would be inappropriate to require uniform approaches, processes, risks, and controls.

Other than that, the principles offer broad guidelines within the context of a management framework. Managers are urged to use formal approaches that are applicable to and suitable for their organisation’s unique circumstances, rationally and methodically addressing risks to information.

Identifying and putting information risks under management supervision enables them to be managed effectively, in a manner that adapts to trends and capitalises on growth opportunities, resulting in the ISMS evolving and becoming more successful over time.

ISO 27005 further facilitates compliance with ISO 27001, since the latter specification requires that all controls applied as part of an ISMS (Information Security Management System) be risk-based. This condition can be met by implementing an ISO 27005-compliant information security risk management framework.

Why is ISO 27005 Important for your Organisation?

ISO/IEC 27005 allows you to develop the requisite expertise and experience to initiate the development of a risk management process for information security.

As such, it demonstrates that you are capable of identifying, assessing, analysing, evaluating, and treating a variety of information security threats that can affect your organisation. Additionally, it allows you to assist organisations in prioritising risks and taking proactive measures to eliminate or minimise them.

ISO/IEC 27005 is a standard devoted exclusively to information security risk management. The document is extremely beneficial if you wish to gain a better understanding of information security risk assessment and treatment – in other words, if you want to serve as a consultant or even as a permanent information security/risk manager.

The ISO/IEC 27005 Certificate validates that you have the following:

  • Acquired the requisite expertise to assist an organisation in effectively implementing an information technology risk management process.
  • Acquired the skills necessary to handle an information security risk assessment process responsibly and in compliance with all applicable legal and regulatory criteria.
  • Capacity to oversee staff responsible for network security and risk control.
  • The capacity to assist an organisation in aligning their ISMS with ISRM operation goals.

How can help?

At, our robust cloud-based solution simplifies the ISO 27005 implementation process. We offer solutions that help you document your ISMS processes and checklists so that you can demonstrate compliance with the relevant standards.

Using our cloud-based platform means that you can manage all your checklists in one place, collaborate with your team and have access to a rich suite of tools that makes it easy for your organisation to design and implement an ISMS that is in line with global best practices.

We have an in-house team of information technology professionals who will advise and assist you all the way so that your ISMS design and implementation goes off without a hitch.

Contact at +44 (0)1273 041140 to learn more about how we can assist you in meeting your ISO 2K7 goals.

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Explore other standards within the ISO 27k family

  • 1

    The ISO 27000 family

  • 2

    ISO 27002

  • 3

    ISO 27003

  • 4

    ISO 27004

  • 5

    ISO 27005

  • 6

    ISO 27008

  • 7

    ISO 27009

  • 8

    ISO 27010

  • 9

    ISO 27014

  • 11

    ISO 27013

  • 12

    ISO 27016

  • 13

    ISO 27017

  • 14

    ISO 27018

  • 15

    ISO 27019

  • 16

    ISO 27038

  • 17

    ISO 27039

  • 18

    ISO 27040

  • 19

    ISO 27050

  • 20

    ISO 27102