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
10.0.17763.3770 — https://support.microsoft.com/help/5021237
10.0.19043.2364 — https://support.microsoft.com/help/5021233
10.0.20348.1366 — https://support.microsoft.com/help/5021249
10.0.22000.1335 — https://support.microsoft.com/help/5021234
10.0.22621.993 — https://support.microsoft.com/help/5021255
10.0.10240.19624 — https://support.microsoft.com/help/5021243
10.0.14393.5582 — https://support.microsoft.com/help/5021235
6.1.7601.26266 — https://support.microsoft.com/help/5021291
6.1.7601.26266 — https://support.microsoft.com/help/5021288
6.3.9600.20721 — https://support.microsoft.com/help/5021294
6.3.9600.20721 — https://support.microsoft.com/help/5021296
6.0.6003.21815 — https://support.microsoft.com/help/5021289
6.0.6003.21815 — https://support.microsoft.com/help/5021293
6.2.9200.24018 — https://support.microsoft.com/help/5021285
6.2.9200.24018 — https://support.microsoft.com/help/5021303