What is a zero day? A powerful but fragile weapon
Zero-day definition
A zero day is a security flaw that has not yet been patched by the vendor and can be exploited and turned into a powerful weapon. Governments discover, purchase, and use zero days for military, intelligence and law enforcement purposes — a controversial practice, as it leaves society defenseless against other attackers who discover the same vulnerability.
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Story added 30. July 2019, content source with full text you can find at link above.