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IEC TR 27023: Mapping ISO/IEC 27001 to ISO/IEC 27002
A Practical Guide to Aligning ISMS Requirements with Security Controls
Understanding the Mapping Framework
ISO/IEC 27001 specifies the requirements for establishing, implementing, maintaining, and continually improving an Information Security Management System (ISMS), while ISO/IEC 27002 provides a comprehensive catalogue of information security controls with implementation guidance. IEC TR 27023 serves as the essential bridge between these two cornerstone standards, offering a structured mapping that translates the high-level Annex A control references in 27001 into the detailed control descriptions and implementation guidance found in 27002.
When conducting a gap analysis, always start with the IEC TR 27023 mapping table to ensure no control objective is overlooked during the transition from risk assessment to control selection.
The technical report organizes the mapping around the four ISMS process domains defined in 27001 Clause 6 — Planning, Clause 7 — Support, Clause 8 — Operation, Clause 9 — Performance Evaluation, and Clause 10 — Improvement. Each Annex A control is cross-referenced with its corresponding 27002 clause, revealing not only direct one-to-one relationships but also many-to-one and one-to-many mappings that arise when a single 27001 control objective maps to multiple 27002 controls or vice versa.
| ISO/IEC 27001 Annex A Control | ISO/IEC 27002 Clause | Mapping Type | Implementation Priority |
|---|---|---|---|
| A.5.1.1 — Information security policy | 5.1 — Management direction | One-to-one | High |
| A.6.1.1 — Information security roles | 6.1 — Internal organization | One-to-one | High |
| A.8.1.1 — Inventory of assets | 8.1 — Responsibility for assets | One-to-one | High |
| A.9.2.1 — User registration | 9.2 — User access management | One-to-one | Medium |
| A.12.6.1 — Technical vulnerability management | 12.6 — Technical vulnerability management | One-to-one | High |
| A.16.1.1 — Incident management responsibilities | 16.1 — Management of incidents | One-to-many | Critical |
Be aware that the mapping is not always symmetrical. Some 27001 Annex A controls encompass broader objectives that span multiple 27002 controls. Always verify the context of your organization’s risk assessment before finalizing control selections.
Practical Mapping Methodology and Best Practices
Implementing the mapping from IEC TR 27023 requires a systematic approach. Organizations should first establish their ISMS context and conduct a thorough risk assessment per 27001 Clause 6.1. Once risks are identified and evaluated, the Statement of Applicability (SoA) enumerates which Annex A controls are relevant. This is precisely where IEC TR 27023 adds value — each selected control from the SoA can be rapidly expanded into actionable implementation guidance using the corresponding 27002 clause.
Best practice suggests creating a master mapping spreadsheet that includes: (1) the 27001 Annex A control identifier and objective, (2) the corresponding 27002 clause number and title, (3) the mapped 27002 implementation guidance summary, (4) the organization’s implementation status, and (5) cross-references to internal policies and procedures. This living document should be updated whenever either standard undergoes revision.
Organizations that maintain a dynamic mapping document report 40% faster audit preparation cycles and significantly fewer non-conformities during external surveillance audits, as the traceability between risk treatment decisions and implemented controls is immediately visible.
Leveraging the Mapping for Audit and Compliance
Certification auditors frequently examine the traceability from risk assessment outcomes through the SoA to implemented controls. IEC TR 27023’s mapping provides the evidentiary chain that auditors seek. When a control is listed in the SoA as “applicable,” the auditor will expect to see corresponding 27002 implementation guidance reflected in the organization’s procedures.
For organizations pursuing ISO/IEC 27001:2022 certification, the transition from the 2013 edition introduced significant changes to Annex A, reorganizing controls from 14 domains to 4 themes and adding new controls related to threat intelligence, cloud services, and ICT readiness. IEC TR 27023 helps navigate these structural changes by clearly mapping legacy controls to their new positions.
Failing to maintain an up-to-date mapping between 27001 and 27002 is one of the most common causes of major non-conformities during certification audits. Treat the mapping as a controlled document subject to the same review cycle as your ISMS policy.
Frequently Asked Questions
Q: Is IEC TR 27023 a normative (required) standard?
A: No, it is a Technical Report and therefore purely informative. However, it represents the consensus view of ISO/IEC experts on how the two standards relate, making it the de facto reference for mapping exercises.
A: No, it is a Technical Report and therefore purely informative. However, it represents the consensus view of ISO/IEC experts on how the two standards relate, making it the de facto reference for mapping exercises.
Q: How often is IEC TR 27023 updated?
A: It is revised in alignment with major revisions of either ISO/IEC 27001 or ISO/IEC 27002. The most recent update followed the 2022 revisions of both standards.
A: It is revised in alignment with major revisions of either ISO/IEC 27001 or ISO/IEC 27002. The most recent update followed the 2022 revisions of both standards.
Q: Can small organizations benefit from this mapping?
A: Absolutely. Small and medium-sized enterprises gain disproportionate value from the mapping because it reduces the time and expertise needed to translate high-level ISMS requirements into concrete, implementable controls.
A: Absolutely. Small and medium-sized enterprises gain disproportionate value from the mapping because it reduces the time and expertise needed to translate high-level ISMS requirements into concrete, implementable controls.
Q: Does the mapping cover all controls in both standards?
A: Yes, the technical report provides comprehensive coverage of all Annex A controls from 27001 and all clauses from 27002, including the new controls introduced in the 2022 edition.
A: Yes, the technical report provides comprehensive coverage of all Annex A controls from 27001 and all clauses from 27002, including the new controls introduced in the 2022 edition.
