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What is Zero-Day Vulnerability?
Definition
A previously unknown software vulnerability that is actively exploited by attackers before the vendor has released a patch.
Security Impact
Zero-days are the most dangerous vulnerability class because no defense exists at the time of discovery. They are commonly used in state-sponsored attacks and ransomware campaigns.
How to Remediate
Implement defense-in-depth strategies, use Web Application Firewalls (WAF) with behavioral detection, enable real-time monitoring, and maintain rapid patching workflows.
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