External attack surface management (EASM) buyer's guide
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Guidance on choosing an external attack surface management (EASM) tool
Adapted edition
- Document type
- Reference Guide
- Format
- DOCX
- Pages
- 7
- Language
- English
- Version
- 1.0
- Updated
- 2026-09-16
- Category
- Information security
- Licence
- Open Government Licence v3.0
Description
Guidance on choosing an external attack surface management (EASM) tool for organisational planning, review and training. NCSC guidance is advisory and should be applied to the organisation's own risks and obligations.
Contents
- What is EASM?
- Internal and external ASM
- How do EASM products work?
- Benefits of using EASM products
- Features of EASM products
- Visibility and insight
- Security analysis
- Supporting functions
- How to choose an EASM product
- Example A: Small business
- Example B: SME
- Example C: Large enterprise
- Source links
Source and licence
National Cyber Security Centre
AttributionNational Cyber Security Centre, “External attack surface management (EASM) buyer's guide” (18 September 2025), reused under the Open Government Licence v3.0.
ChangesAdapted 16 September 2026: converted the official HTML article into neutral text-only DOCX and PDF editions. Preserved article headings, paragraphs, lists and plain-text source-link destinations; normalized web whitespace and typographic punctuation; omitted site navigation, topic and download cards, images, logos, scripts, styles and page furniture.
Version history
- v1.016/09/2026