CVE-2021-2193: 
MySQL vulnerability analysis and mitigation

CVE-2021-2193 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 in April 2021 as part of Oracle's Critical Patch Update (Oracle CPU).

The vulnerability has 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 by being easily exploitable by an attacker with high privileges and network access via multiple protocols (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).

The vulnerability was addressed in MySQL version 8.0.24. Organizations using affected versions should upgrade to version 8.0.24 or later. For systems that cannot be immediately upgraded, limiting network access and restricting high-privilege account access can help reduce the risk (Oracle CPU).