Windows Distributed Transaction Coordinator 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 gather information specific to the environment and take additional actions prior to exploitation to prepare the target environment.

Security updates
10.0.17763.6054 — https://support.microsoft.com/help/5040430
10.0.20348.2582 — https://support.microsoft.com/help/5040437
10.0.22000.3079 — https://support.microsoft.com/help/5040431
10.0.19044.4651 — https://support.microsoft.com/help/5040427
10.0.22621.3880 — https://support.microsoft.com/help/5040442
10.0.25398.1009 — https://support.microsoft.com/help/5040438
10.0.10240.20710 — https://support.microsoft.com/help/5040448
10.0.14393.7159 — https://support.microsoft.com/help/5040434
6.0.6003.22769 — https://support.microsoft.com/help/5040499
6.0.6003.22769 — https://support.microsoft.com/help/5040490
6.1.7601.27219 — https://support.microsoft.com/help/5040497
6.1.7601.27219 — https://support.microsoft.com/help/5040498
6.2.9200.24975 — https://support.microsoft.com/help/5040485
6.3.9600.22074 — https://support.microsoft.com/help/5040456