Windows Kerberos Elevation of Privilege 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 prepare the target environment to improve exploit reliability.

Where can I find out more information about this vulnerability?
Please see Certificate-based authentication changes on Windows domain controllers for more information and ways to protect yourself.

Security updates
10.0.17763.2928 — https://support.microsoft.com/help/5013941
10.0.18363.2274 — https://support.microsoft.com/help/5013945
10.0.19043.1706 — https://support.microsoft.com/help/5013942
10.0.20348.707 — https://support.microsoft.com/help/5013944
10.0.22000.675 — https://support.microsoft.com/help/5013943
10.0.10240.19297 — https://support.microsoft.com/help/5013963
10.0.14393.5125 — https://support.microsoft.com/help/5013952
6.1.7601.25954 — https://support.microsoft.com/help/5014012
6.1.7601.25954 — https://support.microsoft.com/help/5013999
6.3.9600.20371 — https://support.microsoft.com/help/5014011
6.3.9600.20365 — https://support.microsoft.com/help/5014001
6.3.9600.20367 — https://support.microsoft.com/help/5014025
6.0.6003.21481 — https://support.microsoft.com/help/5014010
6.0.6003.21481 — https://support.microsoft.com/help/5014006
6.2.9200.23714 — https://support.microsoft.com/help/5014017
6.2.9200.23714 — https://support.microsoft.com/help/5014018