SPNEGO Extended Negotiation (NEGOEX) Security Mechanism Elevation of Privilege Vulnerability

What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

According to the CVSS metric, a successful exploitation could lead to a scope change (S:C). What does this mean for this vulnerability?
This vulnerability could lead to a contained execution environment escape. Please refer to AppContainer Isolation for more information.

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
10.0.17763.7792 — https://support.microsoft.com/help/5065428
10.0.20348.4171 — https://support.microsoft.com/help/5065432
10.0.20348.4106 — https://support.microsoft.com/help/5065306
10.0.19044.6332 — https://support.microsoft.com/help/5065429
10.0.22621.5909 — https://support.microsoft.com/help/5065431
10.0.26100.6584 — https://support.microsoft.com/help/5065426
10.0.26100.6508 — https://support.microsoft.com/help/5065474
10.0.25398.1849 — https://support.microsoft.com/help/5065425
10.0.10240.21128 — https://support.microsoft.com/help/5065430
10.0.14393.8422 — https://support.microsoft.com/help/5065427
6.1.7601.27929 — https://support.microsoft.com/help/5065468
6.1.7601.27929 — https://support.microsoft.com/help/5065510
6.2.9200.25675 — https://support.microsoft.com/help/5065509
6.3.9600.22774 — https://support.microsoft.com/help/5065507