Microsoft says hackers have been actively exploiting a vulnerability that was publicly disclosed by a Google researcher, Tavis Ormandy. The vulnerability in Windows 7 and 8 allows local users to obtain escalated privileges, making it easier for a hacker to compromise a system. Microsoft addressed the vulnerability in its monthly “Patch Tuesday” package of fixes for July. It is nowhere mentioned that whether the attempted attacks had been successful, or how widespread the attempts appeared to be, or if the attacks were successful. Microsoft and some in the security community subscribe to the practice that a vulnerability shouldn’t be made public until a software maker has an opportunity to fix it.
Source: https://thehackernews.com/2013/07/Internet-Explorer-vulnerability-exploit-script.html