Wiz
Vulnerability DatabaseCVE-2025-21566

CVE-2025-21566: 
MySQL vulnerability analysis and mitigation

Overview

A vulnerability has been identified in Oracle MySQL Server's Optimizer component, tracked as CVE-2025-21566. The vulnerability affects MySQL Server versions 9.1.0 and prior. This security issue was disclosed on January 21, 2025, as part of Oracle's Critical Patch Update (Oracle CPU).

Technical details

The vulnerability is characterized by a CVSS 3.1 Base Score of 6.5 (Medium severity) with the following vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. The vulnerability is easily exploitable by a low-privileged attacker with network access via multiple protocols (NVD).

Impact

Successful exploitation of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash, leading to a complete Denial of Service (DoS) of MySQL Server. The vulnerability impacts only the availability of the system, with no direct effects on confidentiality or integrity (Oracle CPU).

Mitigation and workarounds

Oracle has released patches for affected versions as part of the January 2025 Critical Patch Update. Users are strongly recommended to apply these security patches without delay to address the vulnerability (Oracle CPU).

Additional resources

Source: This report was generated using AI

Free Vulnerability Assessment

Benchmark your Cloud Security Posture

Evaluate your cloud security practices across 9 security domains to benchmark your risk level and identify gaps in your defenses.

Request assessment

Additional Wiz resources

Cloud Vulnerability DB

Cloud Vulnerability DB

An open project to list all known cloud vulnerabilities and Cloud Service Provider security issues

Cloud threat landscape

Cloud threat landscape

A comprehensive threat intelligence database of cloud security incidents, actors, tools and techniques

PEACH

PEACH

A step-by-step framework for modeling and improving SaaS and PaaS tenant isolation

Get a personalized demo

Ready to see Wiz in action?

“Best User Experience I have ever seen, provides full visibility to cloud workloads.”
David EstlickCISO
“Wiz provides a single pane of glass to see what is going on in our cloud environments.”
Adam FletcherChief Security Officer
“We know that if Wiz identifies something as critical, it actually is.”
Greg PoniatowskiHead of Threat and Vulnerability Management
Get a demo