In this post, we will be discussing the details of CVE-2023-22103, a vulnerability that exists in the MySQL Server product, specifically within the Optimizer component of Oracle MySQL. This vulnerability affects supported versions 8..34 and prior, as well as 8.1.. This vulnerability has a CVSS 3.1 Base Score of 4.9, which has the potential to disrupt the availability of the impacted MySQL Server.

Exploiting this vulnerability can grant a high privileged attacker with the ability to cause a hang or frequently repeatable crash of the server (resulting in complete denial of service). This can be done through network access via multiple protocols. With a CVSS Vector of CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H, it is clear that the impact of this vulnerability is worth noting.

Code Snippet

Though the specific details of the exploit code are not provided here, this section gives a brief overview of the affected MySQL component:

// Example code snippet representing a potential issue in MySQL Optimizer:
void mysql_optimizer::optimize_query()
  // Vulnerable section

To illustrate the vulnerability's presence, this code snippet demonstrates a simple, yet potentially problematic, segment of code within the MySQL Optimizer. This is merely an example, and the real exploit code may differ.

For more information, you can refer to the following official Oracle MySQL documentation

1. Oracle MySQL Release Notes
2. Oracle Critical Patch Update Advisory - (Month)(Year)
4. MySQL Server: Optimizer Vulnerability

Please note that these links point to official Oracle resources, and it is always recommended to refer to the official documentation for accurate and up-to-date information about security vulnerabilities.

Exploit Details

As mentioned earlier, CVE-2023-22103 allows a high privileged attacker to compromise MySQL Server by exploiting a vulnerability present in the Optimizer component. The attacker can do this by gaining unauthorized network access via multiple protocols.

Successful exploitation of this vulnerability can result in a hang or frequently repeatable crash of the MySQL Server, effectively causing a complete denial of service for the affected server.


It is essential to keep your MySQL Server up to date and apply any patches or security updates provided by the vendor, Oracle. Always ensure your MySQL Server is running on a supported version and consult the official documentation for guidance on security best practices.

If you believe your system is vulnerable to this exploit, make sure you take appropriate action and consult with security professionals to assess and mitigate the risks associated with CVE-2023-22103.


In summary, CVE-2023-22103 is a serious vulnerability affecting MySQL Server, specifically the Optimizer component, for supported versions 8..34 and prior and 8.1.. Taking the necessary precautions and adhering to security best practices can help protect your system from such exploits. Stay vigilant and informed about the latest security updates and advisories from Oracle and other relevant parties.


Published on: 10/17/2023 22:15:00 UTC
Last modified on: 10/19/2023 09:41:00 UTC