The National Security Agency (NSA) has recently issued an urgent advisory to ensure that all Windows-based systems are fully-patched and updated. BlueKeep is a software security vulnerability affecting computers using older versions of the Microsoft operating system (mainly Windows 7, Vista, XP, windows Server 2008 and 2003); Windows 8 and Windows 10 are unaffected. Microsoft considers the flaw « critical », and recommends installing available update patches as soon as possible to affected systems to mitigate the vulnerability, as well as disabling Remote Desktop Services if they are not required. This is a serious vulnerability and it should be addressed right away.