A remote code execution vulnerability exists in Microsoft Windows when the Windows Adobe Type Manager Library improperly handles specially crafted OpenType fonts. An attacker who successfully exploited this vulnerability could take complete control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
Note that users with automatic updating enabled will not need to take any action because the update will be downloaded and installed automatically.
Read Microsoft Security Bulletin here - https://technet.microsoft.com/library/security/MS15-078