What is the severity of CVE-2025-21518?

CVE-2025-21518 is classified as an easily exploitable vulnerability with low privilege requirements.

Who is affected by CVE-2025-21518?

CVE-2025-21518 affects users of Oracle MySQL Server versions 8.0.40 and prior, 8.4.3 and prior, and 9.1.0 and prior.

How do I fix CVE-2025-21518?

To fix CVE-2025-21518, upgrade your MySQL Server to a version later than 8.0.40, 8.4.3, or 9.1.0.

What types of attacks are possible with CVE-2025-21518?

CVE-2025-21518 allows low privileged attackers network access to potentially exploit the MySQL Server through multiple protocols.

What components of MySQL Server are impacted by CVE-2025-21518?

CVE-2025-21518 impacts the Server: Optimizer component of the MySQL Server product.

Vulnerability/
CVE-2025-21518

medium

6.5

CWE

770

EPSS

0.043%

21/1/2025

22/1/2025

CVE-2025-21518

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 8.0.40 and prior, 8.4.3 and prior and 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 Server	<8.0.40<8.4.3<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-2025-21518?
CVE-2025-21518 is classified as an easily exploitable vulnerability with low privilege requirements.
Who is affected by CVE-2025-21518?
CVE-2025-21518 affects users of Oracle MySQL Server versions 8.0.40 and prior, 8.4.3 and prior, and 9.1.0 and prior.
How do I fix CVE-2025-21518?
To fix CVE-2025-21518, upgrade your MySQL Server to a version later than 8.0.40, 8.4.3, or 9.1.0.
What types of attacks are possible with CVE-2025-21518?
CVE-2025-21518 allows low privileged attackers network access to potentially exploit the MySQL Server through multiple protocols.
What components of MySQL Server are impacted by CVE-2025-21518?
CVE-2025-21518 impacts the Server: Optimizer component of the MySQL Server product.

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