Definition
A security flaw that the developers don't know about yet, making it perfect for hackers to exploit. It's like leaving the backdoor unlocked because you didn't know the backdoor existed.
Example Usage
The ransomware attack exploited a zero-day vulnerability in the web server, meaning no patch existed to protect us.
Source: Cybersecurity terminology
Related Terms
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See “Zero-Day Vulnerability” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.
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