CVE-2023-21982: 
MySQL vulnerability analysis and mitigation

CVE-2023-21982 is a vulnerability in the MySQL Server product of Oracle MySQL, specifically affecting the Server: Optimizer component. The vulnerability affects MySQL versions 8.0.32 and prior. This security flaw was disclosed in April 2023 as part of Oracle's Critical Patch Update (Oracle Advisory).

The vulnerability has been assigned a CVSS 3.1 Base Score of 4.9 (Medium severity) with the following vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H. The vulnerability is characterized as easily exploitable and requires a high-privileged attacker with network access via multiple protocols to compromise MySQL Server (NVD).

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 only affects availability, with no impact on confidentiality or integrity (Oracle Advisory, NetApp Advisory).

Oracle has released patches to address this vulnerability in MySQL version 8.0.33. Users are strongly advised to upgrade to this version or apply the relevant security patches. The fix has been incorporated into various vendor products, including Ubuntu's MySQL 8.0.33-0ubuntu0.22.04.1 package (Ubuntu Security).