Windows Pragmatic General Multicast (PGM) 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 take additional actions prior to exploitation to prepare the target environment.

According to the CVSS score, the attack vector is network (AV:N). What does this mean for this vulnerability?
Windows Pragmatic General Multicast (PGM) produces multicast traffic that runs on layer 4 and is routable. Therefore this vulnerability can be exploited over the network.

How could an attacker exploit this vulnerability?
An attacker could exploit this vulnerability by sending specially crafted malicious traffic to a vulnerable server.

Security updates
10.0.17763.5458 — https://support.microsoft.com/help/5034768
10.0.20348.2322 — https://support.microsoft.com/help/5034770
10.0.22000.2777 — https://support.microsoft.com/help/5034766
10.0.19044.4046 — https://support.microsoft.com/help/5034763
10.0.22621.3155 — https://support.microsoft.com/help/5034765
10.0.25398.709 — https://support.microsoft.com/help/5034769
10.0.10240.20469 — https://support.microsoft.com/help/5034774
10.0.14393.6709 — https://support.microsoft.com/help/5034767
6.0.6003.22511 — https://support.microsoft.com/help/5034795
6.0.6003.22511 — https://support.microsoft.com/help/5034833
6.1.7601.26961 — https://support.microsoft.com/help/5034831
6.1.7601.26961 — https://support.microsoft.com/help/5034809
6.2.9200.24710 — https://support.microsoft.com/help/5034830
6.3.9600.21813 — https://support.microsoft.com/help/5034819