A new vulnerability, CVE-2025-21529, has been discovered in the MySQL Server product of Oracle MySQL, specifically in the Server: Information Schema component. The supported versions affected by this vulnerability are 8..40 and prior, 8.4.3 and prior, and 9.1. and prior. This vulnerability is easily exploitable and allows a high privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in an unauthorized ability to cause a hang or frequently repeatable crash (complete DoS) of the MySQL Server. The CVSS 3.1 Base Score for this vulnerability is 4.9 (Availability impacts) with a CVSS Vector of (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).

Code Snippet

Although the specific details of the vulnerability have not been released to the public yet, it is crucial to understand the basics of MySQL Server and Information Schema components for better comprehension of the issue. Here is a simple example of using the Information Schema in MySQL:

SELECT table_name, column_name, data_type
FROM information_schema.columns
WHERE table_schema = 'your_database_name'
AND column_name LIKE '%column_name_fragment%';

This query retrieves the table names, column names, and data types for columns in a specific database that have a specific text fragment in their names.

Original References

For more information about the CVE-2025-21529 vulnerability, please consult the Oracle Security Advisory at:

Oracle Critical Patch Update Advisory - October 2025

Exploit Details

While there are no known exploits for the CVE-2025-21529 vulnerability currently available in the wild, it is important to understand the possible implications of this issue.

1. CVE-2025-21529 allows a high privileged attacker with network access via multiple protocols to compromise the MySQL Server.

2. The attacker with high privileges can exploit this vulnerability to cause a hang or frequently repeatable crash of the MySQL Server, leading to a complete denial of service (DoS) on the targeted system.

Recommendations

As there is no known patch or workaround for this vulnerability at this moment, it is essential to keep a close watch on announcements from Oracle and apply updates as soon as they are available. It's also crucial to follow best security practices for MySQL Server deployments. Some of these practices include:

1. Use the principle of least privilege when granting access and permissions to users on the MySQL Server.

2. Enable secure connections using SSL/TLS for encrypted communication between client applications and the MySQL Server.

Regularly review and monitor logs for any signs of suspicious or unauthorized activity.

4. Use proper network security practices, like firewall rules and network segmentation, to limit the exposure of the MySQL Server to potential attackers.

Keep your MySQL Server installation up-to-date and apply security patches promptly.

By following these best practices and staying vigilant for updates, you can minimize the potential impact of the CVE-2025-21529 vulnerability on your MySQL Server deployments.

Timeline

Published on: 01/21/2025 21:15:18 UTC
Last modified on: 01/22/2025 18:15:20 UTC