Critical Vulnerability in MySQL Server: Denial of Service Risk in mysql-8.0 Package

mysql-5.5 Updated 02 Oct 2025

Summary

18/04/2023

Disclosed on

N/A

Severity

No i

Fix available

Medium

Severity

4.9

CVSS Score

UBUNTU-CVE-2023-21982: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Affects mysql-5.5 versions 5.5.32-0ubuntu7 – 5.5.62-0ubuntu0.14.04.1. No fix is published. How to fix ↓

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Background

MySQL is a widely-used open-source relational database management system that enables users to manage and store data efficiently. The mysql-8.0 package is a key component of MySQL, providing essential functionalities for database operations. This package is known for its high performance, reliability, and ease of use, making it a popular choice for developers and businesses alike. However, it is susceptible to vulnerabilities that can compromise its integrity and availability.

Vulnerability Detail

The vulnerability identified as CVE-2023-21982 affects MySQL Server versions 8.0.32 and prior. It originates from a flaw in the Server: Optimizer component, which can be exploited by high-privileged attackers with network access. Successful exploitation can lead to a denial of service (DoS) condition, causing the MySQL Server to hang or crash repeatedly. This vulnerability poses a significant risk to database availability, with a CVSS score of 4.9 indicating medium severity.

How To Fix

No fixed version is published for this vulnerability.

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Workaround

As a temporary workaround, consider restricting network access to the MySQL Server to trusted hosts only. This can be achieved by configuring the MySQL server's bind-address setting in the my.cnf configuration file to limit connections.

Conclusion

The CVE-2023-21982 vulnerability in MySQL Server poses a significant risk to database availability, allowing potential denial of service attacks. It is essential for users to update to the latest patched version of the mysql-8.0 package to mitigate this risk. Additionally, implementing network access restrictions can serve as a temporary workaround until the update is applied.

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