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Also known as: CNSSI No. 4009
A U.S. national security systems glossary standardizing cybersecurity and information assurance terminology.
DESCRIPTION
CNSSI No. 4009 is the Committee on National Security Systems Instruction that defines standardized terms for U.S. national security systems. It promotes consistent use of cybersecurity and information assurance vocabulary across agencies and contractors. The glossary supports RMF, accreditation, and compliance efforts by aligning terminology. It complements NIST publications and ISO standards while focusing on U.S. national security contexts.
ALTERNATIVE DEFINITIONS
Committee on National Security Systems
CNSSI No. 4009 provides a common set of information assurance terms and definitions for use across the National Security Community.
Official statement emphasizing common terminology for the national security community.
DoD Cyber Exchange
The CNSS Glossary provides a central resource of terms and definitions used in CNSS issuances and national security systems.
Highlights its role as a central resource for CNSS terminology.
RELATED TERMS
NIST SP 800-53 NIST SP 800-37 RMF FIPS 199 FIPS 200 ISO-IEC 27001 NIST CSF DoD RMF Information Assurance Security Glossary
COMPETING TERMS
NIST Glossary ISO/IEC 27000
KNOWLEDGE AREAS
Data Security Data Governance Data Privacy & Compliance
TARGET AUDIENCE
Chief Information Security Officer Security Architect Cybersecurity Engineer IT Auditor Data Privacy Officer Chief Information Officer
EXTERNAL SOURCES
- Wikipedia - Committee on National Security Systems
- DoD Cyber Exchange - Official PDF
- NIST CSRC - NIST glossary
- ISO - ISO 27000 terms
TOP QUESTIONS
What is CNSSI 4009?
It’s the CNSS Glossary standardizing information assurance terms for U.S. national security systems. It fosters consistent terminology across agencies.
Category: Definition
Who uses CNSSI 4009?
U.S. government agencies, defense contractors, and organizations working with national security systems use it for consistent terminology.
Category: Audience
How does CNSSI 4009 relate to the NIST Glossary?
They are complementary; CNSSI targets national security contexts while NIST spans broader federal and industry use.
Category: Comparison
Why is standardized terminology important?
Clarity reduces compliance gaps and audit misunderstandings. It enables aligned policies and consistent RMF execution.
Category: Relevancy
How often is CNSSI 4009 updated?
It is revised periodically to reflect evolving threats and guidance. Always check the latest published version.
Category: Maintenance
How does CNSSI 4009 support RMF?
By defining core terms consistently, it underpins control interpretation, risk categorization, and accreditation documentation.
Category: UseCases
Is CNSSI 4009 mandatory?
For national security systems, its use is typically required or strongly recommended to ensure common understanding.
Category: Compliance
What are common pitfalls using multiple glossaries?
Conflicting definitions lead to policy drift. Establish a primary glossary and map others to it.
Category: Mistakes
How can organizations adopt CNSSI 4009?
Reference it in policies, train staff, and integrate terms into governance and audit artifacts.
Category: HowTo