Windows SMBv3 Server Remote Code Execution Vulnerability

How could an attacker exploit this vulnerability?
To successfully exploit this vulnerability, an attacker would need to use a malicious SMB client to mount an attack against the SMB server. This exploit is only applicable to SMB over QUIC.

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
10.0.20348.2849 — https://support.microsoft.com/help/5046616
10.0.20348.2819 — https://support.microsoft.com/help/5046698