CVE-2025-21566

mysql: Denial of Service Vulnerability in MySQL Server Optimizer

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Severity

Moderate

Red Hat Product Security

6.5

CVSS 3.1

Review impact separately from score.

Published · January 22, 2025

Updated · November 21, 2025

Description

A flaw was found in MySQL Server, specifically in the Optimizer component. This vulnerability allows a low-privileged attacker to cause a hang or frequently repeatable crash, meaning a complete denial of service, via network access using multiple protocols.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-404 · Improper Resource Shutdown or Release