Windows IIS Server 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 take additional actions prior to exploitation to prepare the target environment.

What privileges could be gained by an attacker who successfully exploited the vulnerability?
An attacker who successfully exploited the vulnerability could bypass authentication on Windows IIS Server. Attackers might be able to post or get information from the Web Service (CVSS metrics C:H/I:H), but would not be able to disrupt the service.

Security updates
10.0.14393.5246 — https://support.microsoft.com/help/5015808
6.1.7601.26022 — https://support.microsoft.com/help/5015861
6.1.7601.26022 — https://support.microsoft.com/help/5015862
6.3.9600.20478 — https://support.microsoft.com/help/5015874
6.3.9600.20478 — https://support.microsoft.com/help/5015877
6.0.6003.21569 — https://support.microsoft.com/help/5015866
6.0.6003.21569 — https://support.microsoft.com/help/5015870
6.2.9200.23771 — https://support.microsoft.com/help/5015863
6.2.9200.23771 — https://support.microsoft.com/help/5015875
10.0.17763.3165 — https://support.microsoft.com/help/5015811
10.0.19043.1826 — https://support.microsoft.com/help/5015807
10.0.20348.825 — https://support.microsoft.com/help/5015827
10.0.22000.795 — https://support.microsoft.com/help/5015814
10.0.10240.19360 — https://support.microsoft.com/help/5015832