Windows Secure Socket Tunneling Protocol (SSTP) Remote Code Execution Vulnerability

How could an attacker exploit this vulnerability?
An unauthenticated attacker could send a specially crafted protocol message to a Routing and Remote Access Service (RRAS) server, which could lead to remote code execution (RCE) on the RAS server machine.

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation of this vulnerability requires an attacker to win a race condition.

Security updates
10.0.17763.3287 — https://support.microsoft.com/help/5016623
10.0.19043.1889 — https://support.microsoft.com/help/5016616
10.0.20348.887 — https://support.microsoft.com/help/5016627
10.0.22000.856 — https://support.microsoft.com/help/5016629
10.0.10240.19387 — https://support.microsoft.com/help/5016639
10.0.14393.5291 — https://support.microsoft.com/help/5016622
6.1.7601.26065 — https://support.microsoft.com/help/5016676
6.1.7601.26065 — https://support.microsoft.com/help/5016679
6.3.9600.20520 — https://support.microsoft.com/help/5016681
6.3.9600.20520 — https://support.microsoft.com/help/5016683
6.0.6003.21616 — https://support.microsoft.com/help/5016669
6.0.6003.21616 — https://support.microsoft.com/help/5016686
6.2.9200.23817 — https://support.microsoft.com/help/5016672
6.2.9200.23817 — https://support.microsoft.com/help/5016684