Microsoft has said that the vulnerability present in their operating system would have allowed a hacker to gain complete access to an affected computer.
The vulnerability is present in Windows Vista, Windows 7, Windows 8 and 8.1 and Windows RT. These operating systems represent two out of three computers in the world that run a Microsoft operating system.
The company had previously provided an update like this in November 2014 also.
The flaw is said to exist in the final version of Windows 10 also that will be available to users from July 29.
The security fix will be done through Windows Update