noun
zero-day vulnerability
A software security flaw that is unknown to the vendor and for which no patch exists, leaving systems exposed. Often used in the context of zero-day attacks.
See also: ゼロデイ攻撃
このゼロデイ脆弱性を修正するパッチはまだ提供されていない。
A patch to fix this zero-day vulnerability has not yet been released.
The attacker exploited a zero-day vulnerability to break into the system.