Making Zero-Day Flaws Disappear Compliance Compliance Twitter Get Permission Maddie Stone, a security researcher with Google Project Zero, speaks on Friday at the AusCERT computer security conference. This year is on track to be a record one for zero-day vulnerabilities, the term for software flaws that are being actively exploited in the wild and do not have a fix. About 21 have been discovered so far, and if that pace continues, the year could end with more than 60, says Maddie Stone, a security researcher with Google's Project Zero bug hunting team. That compares with 24 zero-day flaws found all of last year. Why such big growth?