CVE-2025-21575 is a vulnerability in the MySQL Server parser component affecting versions 8.0.0 through 8.0.41, 8.4.0 through 8.4.4, and 9.0.0 through 9.2.0. It allows a low-privileged attacker with network access to cause a denial of service by hanging or crashing the MySQL Server. The vulnerability has a CVSS 3.1 base score of 6.5, indicating a medium severity impact focused on availability.