Primary definition
A sign that an attacker may be preparing to cause an incident. Source: NIST SP 800-61 Rev 2 See indicator.
Also known asindicator · precursor indicator · pre-attack indicator · warning sign · early warning sign · precursor sign · precursor event · precursor activity · precursor behavior · precursor signal
3 sources cited4 related termsReviewed Aug 10, 2026
— Committee on National Security Systems Glossary CNSSI 4009-2015View source
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CNSSGC
A sign that an attacker may be preparing to cause an incident. Source: NIST SP 800-61 Rev 2 See indicator.
Committee on National Security Systems Glossary CNSSI 4009-2015 · 2024
Cite this term
Permanent URL · stable across revisions
Election Security Glossary. (2026). Precursor. In Election Security Glossary. Retrieved August 21, 2026, from https://electionsecurityglossary.com/glossary/precursor
Sources
3 cited · last checked Aug 10, 2026
01
Committee on National Security Systems Glossary CNSSI 4009-2015
Committee on National Security Systems Glossary CNSSI 4009-2015
High consensus
02
NICCS Glossary
NICCS Glossary
Multi-source
03
The Cyber Glossary
The Cyber Glossary
Multi-source
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