Windows Remote Desktop Protocol Security Feature Bypass

What security feature is bypassed with this vulnerability?
The RDP Gateway protocol is enforcing the usage of Datagram Transport Layer Security (DTLS) version 1.0, which is a deprecated (RFC 8996) protocol with known vulnerabilities. An attacker with a machine-in-the-middle (MitM) position who successfully exploited this vulnerability could compromise the confidentiality and integrity of data when the targeted user connects to a trusted server.

Security updates
10.0.17763.4645 — https://support.microsoft.com/help/5028168
10.0.20348.1850 — https://support.microsoft.com/help/5028171
10.0.22000.2176 — https://support.microsoft.com/help/5028182
10.0.19044.3208 — https://support.microsoft.com/help/5028166
10.0.22621.1992 — https://support.microsoft.com/help/5028185
10.0.10240.20048 — https://support.microsoft.com/help/5028186
10.0.14393.6085 — https://support.microsoft.com/help/5028169
6.1.7601.26623 — https://support.microsoft.com/help/5028240
6.1.7601.26623 — https://support.microsoft.com/help/5028224
6.2.9200.24374 — https://support.microsoft.com/help/5028232
6.2.9200.24374 — https://support.microsoft.com/help/5028233
6.3.9600.21063 — https://support.microsoft.com/help/5028228
6.3.9600.21075 — https://support.microsoft.com/help/5028223