Zero-day exploits are a hacker’s best friend. They attack vulnerabilities in software that are unknown to the software maker and are therefore unpatched. Criminal hackers and intelligence agencies use zero day exploits to open a stealth door into your system, and because antivirus companies also don’t know about them, the exploits can remain undetected for years before they’re discovered. Until now, they’ve usually been uncovered only by chance.
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ORIGINAL SOURCE: Wired