Windows Graphics Component Elevation of Privilege Vulnerability

Why are there two different impacts in the Security Updates table?
An attacker could potentially exploit this vulnerability to elevate privileges from a client-side application sandbox in earlier Microsoft operating systems. However, mitigation technologies in later Microsoft operating systems make this more difficult. For this reason, this vulnerability has two different impact ratings.

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

Security updates
10.0.17763.3770 — https://support.microsoft.com/help/5021237
10.0.19043.2364 — https://support.microsoft.com/help/5021233
10.0.20348.1366 — https://support.microsoft.com/help/5021249
10.0.22000.1335 — https://support.microsoft.com/help/5021234
10.0.22621.993 — https://support.microsoft.com/help/5021255
10.0.10240.19624 — https://support.microsoft.com/help/5021243
10.0.14393.5582 — https://support.microsoft.com/help/5021235
6.1.7601.26266 — https://support.microsoft.com/help/5021291
6.1.7601.26266 — https://support.microsoft.com/help/5021288
6.3.9600.20721 — https://support.microsoft.com/help/5021294
6.3.9600.20721 — https://support.microsoft.com/help/5021296
6.0.6003.21815 — https://support.microsoft.com/help/5021289
6.0.6003.21815 — https://support.microsoft.com/help/5021293
6.2.9200.24018 — https://support.microsoft.com/help/5021285
6.2.9200.24018 — https://support.microsoft.com/help/5021303