Zero Day

nounid 4703·updated May 9, 2026

candidate

GlossaryL1 — what DictionaryL2 — how used ThesaurusL3 — relations Universaleverything

The "Day Zero" or "Zero Day" is the day a new vulnerability is made known. In some cases, a "zero day" exploit is referred to an exploit for which no patch is available yet. ("day one" - day at which the patch is made available).

MWE

Classifications

per-axis with provenance

Entity Type

Vulnerability95%rule-basedr:entity.vulnerability.cve.v1

Sensitivity

unclassified

Information Class

unclassified

Variants

3 surface forms

plural: Zero Days
possessive: Zero Day's
pluralpossessive: Zero Days'

Framework definitions

1 sense across 1 framework

SANS Glossary of Security Terms1 senseview framework →

§1: The "Day Zero" or "Zero Day" is the day a new vulnerability is made known. In some cases, a "zero day" exploit is referred to an exploit for which no patch is available yet. ("day one" - day at which the patch is made available).

Outgoing relationships

term as subject — 0 triples

No outgoing triples

This term is not the subject of any RDF-style relationship yet.

Incoming relationships

term as object — 0 triples

No incoming triples

No other term currently asserts a relationship to this one.