CVE-2021-2170: 
MySQL vulnerability analysis and mitigation

CVE-2021-2170 is a vulnerability in the MySQL Server product of Oracle MySQL, specifically affecting the Server: Optimizer component. The vulnerability affects MySQL Server versions 8.0.23 and prior. This vulnerability was disclosed as part of Oracle's Critical Patch Update in April 2021 (Oracle CPU).

The vulnerability is characterized by 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 high privileges and network access via multiple protocols to exploit. The technical assessment indicates it is easily exploitable (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 impact on confidentiality or integrity (Oracle CPU).

Oracle released patches for this vulnerability in MySQL version 8.0.24. Users are advised to upgrade to this version or later to address the vulnerability. The fix was distributed through Oracle's April 2021 Critical Patch Update (Oracle CPU, NetApp Advisory).