What is the severity of CVE-2025-21521?

CVE-2025-21521 is considered an easily exploitable vulnerability that allows unauthorized access, impacting the security of MySQL Server.

How do I fix CVE-2025-21521?

To fix CVE-2025-21521, upgrade to MySQL Server versions 8.0.40, 8.4.3, or 9.0.2 or later.

Which MySQL Server versions are affected by CVE-2025-21521?

The affected MySQL Server versions include 8.0.39 and prior, 8.4.2 and prior, and 9.0.1 and prior.

Who is affected by CVE-2025-21521?

Organizations using affected versions of MySQL Server may be vulnerable to attacks due to CVE-2025-21521.

Can CVE-2025-21521 be exploited remotely?

Yes, CVE-2025-21521 can be exploited by unauthenticated attackers with network access via multiple protocols.

Vulnerability/
CVE-2025-21521

high

7.5

CWE

770

EPSS

0.043%

21/1/2025

22/1/2025

CVE-2025-21521

First published: Tue Jan 21 2025(Updated: )

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Thread Pooling). Supported versions that are affected are 8.0.39 and prior, 8.4.2 and prior and 9.0.1 and prior. Easily exploitable vulnerability allows unauthenticated 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 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/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<9.0.2

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Reference Links

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

Frequently Asked Questions

What is the severity of CVE-2025-21521?
CVE-2025-21521 is considered an easily exploitable vulnerability that allows unauthorized access, impacting the security of MySQL Server.
How do I fix CVE-2025-21521?
To fix CVE-2025-21521, upgrade to MySQL Server versions 8.0.40, 8.4.3, or 9.0.2 or later.
Which MySQL Server versions are affected by CVE-2025-21521?
The affected MySQL Server versions include 8.0.39 and prior, 8.4.2 and prior, and 9.0.1 and prior.
Who is affected by CVE-2025-21521?
Organizations using affected versions of MySQL Server may be vulnerable to attacks due to CVE-2025-21521.
Can CVE-2025-21521 be exploited remotely?
Yes, CVE-2025-21521 can be exploited by unauthenticated attackers with network access via multiple protocols.

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