Google will release details of any zero-day flaws it finds in software, if the affected vendor fails to issue a patch or disclose the issue itself within a week. The reason for this special designation is that each day an actively exploited vulnerability remains undisclosed to the public and unpatched, more computers will be compromised. Earlier this month, Google security engineer Tavis Ormandy exposed a Microsoft flaw on Full Disclosure. Even if a company can’t address the bug in seven days, the researchers could still publish details of the flaw after a week so that the public can protect itself.
Source: https://thehackernews.com/2013/05/google-sets-7-day-deadline-for_30.html