Microsoft has released an emergency software update for all versions of Microsoft Windows, the company has said that the patch was released to fix a security vulnerability.
The Microsoft Windows emergency update has been released for Windows Vista, Windows 7, Windows 8, Windows 8.1 and Windows RT.
This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow remote code execution if a user opens a specially crafted document or visits an untrusted webpage that contains embedded OpenType fonts.
This security update is rated Critical for all supported releases of Microsoft Windows. For more information, see the Affected Software section.
The security update addresses the vulnerability by correcting how the Windows Adobe Type Manager Library handles OpenType fonts. For more information about the vulnerability, see the Vulnerability Information section. For more information about this update, see Microsoft Knowledge Base Article 3079904.
You can find out more details about the software update for all versions of Microsoft Windows at the link below.
Source Microsoft