Microsoft Windows 10 1607 and Windows Server 2016 allow an attacker to exploit a security feature bypass vulnerability in Device Guard that could allow the attacker to inject malicious code into a Windows PowerShell session, aka "Device Guard Code Integrity Policy Security Feature Bypass Vulnerability." This CVE ID is unique from CVE-2017-0215, CVE-2017-0216, CVE-2017-0218, and CVE-2017-0219.
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0173