Primary definition
The unauthorized transfer of information from an information system. Source: NIST SP 800-53 Rev 4
Also known asdata exfiltration · data theft · data leakage · data export · information exfiltration · data extraction
6 sources cited4 related termsReviewed Aug 9, 2026
— Committee on National Security Systems Glossary CNSSI 4009-2015View source
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CNSSGC
The unauthorized transfer of information from an information system. Source: NIST SP 800-53 Rev 4
Committee on National Security Systems Glossary CNSSI 4009-2015 · 2024
Cite this term
Permanent URL · stable across revisions
Election Security Glossary. (2026). Exfiltration. In Election Security Glossary. Retrieved August 22, 2026, from https://electionsecurityglossary.com/glossary/exfiltration
Sources
6 cited · last checked Aug 9, 2026
01
Committee on National Security Systems Glossary CNSSI 4009-2015
Committee on National Security Systems Glossary CNSSI 4009-2015
High consensus
02
March 2020 CSC Report
March 2020 CSC Report
Multi-source
03
EAC Information Technology Terminology
EAC Information Technology Terminology
Disputed
04
NICCS Glossary
NICCS Glossary
Multi-source
05
The Cyber Glossary
The Cyber Glossary
Multi-source
06
ODNI Cyber Threats to Elections Lexicon
ODNI Cyber Threats to Elections Lexicon
Disputed
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