CVE-2022-21370: 
MySQL vulnerability analysis and mitigation

CVE-2022-21370 is a vulnerability in the MySQL Server Optimizer component affecting MySQL Server versions 8.0.27 and prior. This security flaw was disclosed as part of Oracle's January 2022 Critical Patch Update (Oracle CPU, Ubuntu Notice).

The vulnerability exists in the MySQL Server's Optimizer component and has been assigned a CVSS v3.1 base score of 4.9 (MEDIUM), with the vector: AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H. This indicates that the vulnerability requires high privileges to exploit, but could potentially result in high availability impact to the system (NetApp Advisory).

Successful exploitation of this vulnerability could allow a high-privileged attacker with network access to cause a denial of service (DoS) condition, potentially resulting in a hang or frequently repeatable crash of the MySQL Server (Oracle CPU).

The vulnerability requires high privileges and network access to exploit. While public discussion of this vulnerability exists, detailed exploit code has not been publicly disclosed (NetApp Advisory).

Oracle has released patches to address this vulnerability in MySQL version 8.0.28. Users are strongly recommended to update to this version or later. The fix has been included in Ubuntu's security updates for versions 21.10 and 20.04 LTS (Ubuntu Notice).