Exploits of generally unknown vulnerabilities that typically don't have patches yet are called:

Exploits of generally unknown vulnerabilities that typically don't have patches yet are called:

• Fast response
• Unrecognized threat
• Quick acting
• Zero-day 

EXPLANATION

A zero-day vulnerability is a computer-software vulnerability that is unknown to those who would be interested in mitigating the vulnerability. Until the vulnerability is mitigated, hackers can exploit it to adversely affect computer programs, data, additional computers or a network. An exploit directed at a zero-day vulnerability is called a zero-day exploit, or zero-day attack.

 Things to remember about zero-day vulnerabilities. Keep your software up-to-date to help protect yourself against a zero-day vulnerability. Check for a solution when a zero-day vulnerability is announced. Most software vendors work quickly to patch a security vulnerability. Don't underestimate the threat.