Nation-state threat actors often discover

vulnerabilities and hold on to them until they want to launch a sophisticated attack. The Stuxnet attack was an unprecedented style of attack because it used four types of vulnerability.

What is this style of attack called?

A. zero-day

B. zero-hour

C. ze

ro-sum

D. no-day

Stuxnet is a malicious computer worm believed to be a jointly built American-Israeli cyber weapon. Exploiting four zero-day flaws, Stuxnet functions by targeting machines using the Microsoft Windows operating system and

networks, then seeking out Siemens Step7 software.

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