Windows Layer 2 Tunneling Protocol (L2TP) 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
10.0.17763.3887 — https://support.microsoft.com/help/5022286
10.0.20348.1487 — https://support.microsoft.com/help/5022291
10.0.19042.2486 — https://support.microsoft.com/help/5022282
10.0.22000.1455 — https://support.microsoft.com/help/5022287
10.0.22621.1105 — https://support.microsoft.com/help/5022303
10.0.10240.19685 — https://support.microsoft.com/help/5022297
10.0.14393.5648 — https://support.microsoft.com/help/5022289
6.1.7601.26321 — https://support.microsoft.com/help/5022338
6.1.7601.26321 — https://support.microsoft.com/help/5022339
6.3.9600.20778 — https://support.microsoft.com/help/5022352
6.3.9600.20778 — https://support.microsoft.com/help/5022346
6.0.6003.21872 — https://support.microsoft.com/help/5022340
6.0.6003.21872 — https://support.microsoft.com/help/5022353
6.2.9200.24075 — https://support.microsoft.com/help/5022348
6.2.9200.24075 — https://support.microsoft.com/help/5022343