Windows Layer 2 Tunneling Protocol (L2TP) Remote Code Execution Vulnerability

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.

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.

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