The BlueKeep vulnerability (CVE-2019-0708) exists in the Remote Desktop Protocol (RDP) on Windows 7, Windows Server 2008 R2, and Windows Server. Microsoft has issued security updates even for Windows versions it no longer supports. The vulnerability can be leveraged to achieve remote code execution (RCE) on a vulnerable system. At the end of May, more than half of the machines affected by BlueKeep had the security update installed. The number of systems protected against this flaw increased to 72.4% worldwide.
Source: https://www.bleepingcomputer.com/news/security/bluekeep-warnings-pay-off-boost-patching-in-enterprise-networks/