Zero-day attack
nounid
4704·updated May 9, 2026candidate
An attack on a piece of software that has a vulnerability for which there is no known patch.
MWE
Classifications
Entity Type
Vulnerability95%rule-basedr:entity.vulnerability.cve.v1
Sensitivity
unclassified
Information Class
unclassified
Variants
- plural
- Zero-day attacks
- possessive
- Zero-day attack's
- pluralpossessive
- Zero-day attacks'
Framework definitions
- §1
- A zero-day (or zero-hour or day zero) attack or threat is a computer threat that tries to exploit computer application vulnerabilities that are unknown to others or undisclosed to the software developer. Zero-day exploits (actual code that can use a security hole to carry out an attack) are used or shared by attackers before the software developer knows about the vulnerability.
Federal Financial Institutions Examination Council (FFIEC) IT Examination Handbook Infobase, Glossary1 senseview framework →
- §1
- An attack on a piece of software that has a vulnerability for which there is no known patch.
Outgoing relationships
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Incoming relationships
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No other term currently asserts a relationship to this one.