Windows DNS Server Remote Code Execution Vulnerability

According to the CVSS metric, attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation requires the affected DNS server to use a specific non-default server plug-in and configuration that are not present in a default installation.

How could an attacker exploit this vulnerability?
An unauthenticated attacker could exploit this vulnerability by sending a specially crafted packet to an affected service over the network. Successful exploitation could allow the attacker to execute code on the target system. No authentication or user interaction is required.

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 have a deep understanding of the system. Successful exploitation is not guaranteed and depends on a combination of factors that might include the environment, system configuration, and the presence of additional security measures.

Security updates
10.0.20348.5870 — https://support.microsoft.com/help/5131090
10.0.26100.33822 — https://support.microsoft.com/help/5131080
10.0.26100.33730 — https://support.microsoft.com/help/5131077