A vulnerability in the Oracle MySQL Server component 'Optimizer' affects versions 8.0.39 and prior, 8.4.2 and prior, and 9.0.1 and prior. This flaw allows a high-privileged attacker with network access to cause a denial of service by hanging or crashing the MySQL Server. The CVSS 3.1 base score is 4.9, indicating a medium severity primarily impacting availability.