CVE-2021-2196: 
MySQL vulnerability analysis and mitigation

CVE-2021-2196 is a vulnerability in the MySQL Server product of Oracle MySQL, specifically affecting the Server: DML component. The vulnerability affects MySQL versions 8.0.23 and prior. This security issue was disclosed as part of Oracle's Critical Patch Update in April 2021 (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 requires a high-privileged attacker with network access via multiple protocols to exploit. The attack complexity is considered Low, requiring no user interaction (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).

Oracle has released patches for this vulnerability in MySQL version 8.0.24. Users are strongly recommended to update to this version or later. The vulnerability has been addressed in various distributions including Fedora 32, 33, and 34 through the community-mysql-8.0.24-1 update (Fedora Update).