Cyber Security Model
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Information on the Ministry of Defence Cyber Security Model (CSM), including the standards and guidance for suppliers to meet CSM version 4.
Adapted edition
- Document type
- Reference Guide
- Format
- DOCX
- Pages
- 5
- Language
- English
- Version
- 1.0
- Updated
- 2026-09-16
- Category
- Information security
- Licence
- Open Government Licence v3.0
Description
Information on the Ministry of Defence Cyber Security Model (CSM), including the standards and guidance for suppliers to meet CSM version 4. Consult the original guidance for current legal and operational details.
Contents
- Cyber Security Model v4 (CSMv4)
- Video series about changes to the CSM
- Cyber Security Model v4 process
- Flow down guidance for defence suppliers
- What is flow down?
- Who is responsible for flow down?
- Flow down for existing contracts
- Flow down example scenario:
- Learn how to use the Supplier Cyber Protection Service
- Defence Cyber Certification
- Related resources for UK suppliers
- Cyber Security Model v3 (CSMv3)
- Contact
Source and licence
Ministry of Defence
AttributionMinistry of Defence, ‘Cyber Security Model’ (updated 6 March 2026), reused under the Open Government Licence v3.0.
ChangesNeutral text-only adaptation from the official GOV.UK Content API body: headings, paragraphs, ordered and unordered list items and clickable source-link destinations in an appendix preserved. Images, logos, page design, accessible-format request widgets and linked attachments excluded; normalised whitespace, invisible format marks and typography.
Version history
- v1.016/09/2026