CVE-2025-21521

Description

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).

References

Link	Tags
https://www.oracle.com/security-alerts/cpujan2025.html	vendor advisory

Frequently Asked Questions

What is the severity of CVE-2025-21521?: CVE-2025-21521 has been scored as a high severity vulnerability.
How to fix CVE-2025-21521?: To fix CVE-2025-21521, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-21521 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-21521 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-21521?: CVE-2025-21521 affects Oracle Corporation MySQL Server.

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Description

Category

CWE-770 – Allocation of Resources Without Limits or Throttling

References

Frequently Asked Questions