CVE-2021-2479: 
MySQL vulnerability analysis and mitigation

CVE-2021-2479 is a vulnerability discovered in the MySQL Server product of Oracle MySQL, specifically affecting the Server: DML (Data Manipulation Language) component. The vulnerability affects MySQL versions 8.0.26 and prior. This security issue was disclosed in October 2021 as part of Oracle's Critical Patch Update (Oracle CPU).

The vulnerability is classified as an easily exploitable vulnerability that allows high-privileged attackers with network access to compromise MySQL Server through multiple protocols. The vulnerability has received a CVSS 3.1 Base Score of 4.9, indicating a medium severity level, with the following vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H (NVD).

Successful exploitation of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. The vulnerability only affects availability, with no direct impact on confidentiality or integrity (Oracle CPU, NetApp Advisory).

Oracle has released patches to address this vulnerability in their October 2021 Critical Patch Update. Users are advised to update to versions newer than MySQL 8.0.26. Various Linux distributions have also released security updates to address this vulnerability, including Fedora 33, 34, and 35 (Fedora Update).