What is the severity of CVE-2025-21566?

CVE-2025-21566 is classified as an easily exploitable vulnerability that poses a significant risk to affected MySQL Server installations.

How do I fix CVE-2025-21566?

To mitigate CVE-2025-21566, upgrade Oracle MySQL Server to version 9.1.1 or later, as earlier versions are vulnerable.

What versions are affected by CVE-2025-21566?

CVE-2025-21566 affects Oracle MySQL Server versions up to 9.1.0, inclusive.

Who can exploit CVE-2025-21566?

CVE-2025-21566 can be exploited by low privileged attackers with network access via multiple protocols.

What components of MySQL Server are impacted by CVE-2025-21566?

CVE-2025-21566 specifically impacts the Optimizer component of the MySQL Server product.

Vulnerability/
CVE-2025-21566

medium

6.5

CWE

732

EPSS

0.044%

21/1/2025

4/2/2025

CVE-2025-21566

First published: Tue Jan 21 2025(Updated: )

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 9.1.0 and prior. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

Credit: secalert_us@oracle.com

Affected Software	Affected Version	How to fix
MySQL	<9.1.0

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Reference Links

https://www.oracle.com/security-alerts/cpujan2025.html

Frequently Asked Questions

What is the severity of CVE-2025-21566?
CVE-2025-21566 is classified as an easily exploitable vulnerability that poses a significant risk to affected MySQL Server installations.
How do I fix CVE-2025-21566?
To mitigate CVE-2025-21566, upgrade Oracle MySQL Server to version 9.1.1 or later, as earlier versions are vulnerable.
What versions are affected by CVE-2025-21566?
CVE-2025-21566 affects Oracle MySQL Server versions up to 9.1.0, inclusive.
Who can exploit CVE-2025-21566?
CVE-2025-21566 can be exploited by low privileged attackers with network access via multiple protocols.
What components of MySQL Server are impacted by CVE-2025-21566?
CVE-2025-21566 specifically impacts the Optimizer component of the MySQL Server product.

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