CVE-2024-21166 is a vulnerability in the InnoDB component of Oracle MySQL Server affecting versions 8.0.36 and prior, and 8.3.0 and prior. It allows a high privileged attacker with network access via multiple protocols to potentially cause unauthorized modification or deletion of critical data, or cause a denial of service by crashing the MySQL Server. The vulnerability has a CVSS 3.1 base score of 5.9, indicating medium severity with impacts on integrity and availability.