The flaw exists in the Connection Handling component of Oracle MySQL Server and MySQL Cluster. An unauthenticated attacker who can reach the database instance over the network can force the server or cluster to crash repeatedly, causing a complete denial of service. The vulnerability does not affect confidentiality or integrity, but it fully disrupts availability for all users and applications that rely on the affected database instance.

Oracle Corporation MySQL Server versions 8.4.0 through 8.4.9 and 9.0.0 through 9.7.0, and MySQL Cluster versions 8.0.11 through 8.0.46, 8.4.0 through 8.4.9, and 9.0.0 through 9.7.0 are affected. All other product versions are not impacted.

The CVSS v3.1 base score of 7.5 classifies the weakness as high severity, and the EPSS score of less than 1% suggests a low yet non‑zero likelihood of exploitation at the moment. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog, indicating no publicly documented exploitation campaigns yet. However, because the flaw requires no authentication and can be reached from any network, any exposed MySQL instance is a potential target. Successful exploitation triggers an immediate crash, severely impacting application availability.