Original release date: June 17, 2019
The Cybersecurity and Infrastructure Security Agency (CISA) is issuing this Activity Alert to provide information on a vulnerability, known as “BlueKeep,” that exists in the following Microsoft Windows Operating Systems (OSs), including both 32- and 64-bit versions, as well as all Service Pack versions:
An attacker can exploit this vulnerability to take control of an affected system.
BlueKeep (CVE-2019-0708) exists within the Remote Desktop Protocol (RDP) used by the Microsoft Windows OSs listed above. An attacker can exploit this vulnerability to perform remote code execution on an unprotected system.
According to Microsoft, an attacker can send specially crafted packets to one of these operating systems that has RDP enabled. After successfully sending the packets, the attacker would have the ability to perform a number of actions: adding accounts with full user rights; viewing, changing, or deleting data; or installing programs. This exploit, which requires no user interaction, must occur before authentication to be successful.
BlueKeep is considered “wormable” because malware exploiting this vulnerability on a system could propagate to other vulnerable systems; thus, a BlueKeep exploit would be capable of rapidly spreading in a fashion similar to the WannaCry malware attacks of 2017.
CISA tested BlueKeep against a Windows 2000 machine and achieved remote code execution. Windows OS versions prior to Windows 8 that are not mentioned in this Activity Alert may also be affected; however, CISA has not tested these systems.
CISA encourages users and administrators review the Microsoft Security Advisory  and the Microsoft Customer Guidance for CVE-2019-0708  and apply the appropriate mitigation measures as soon as possible: