CVE-2020-2924: 
MySQL vulnerability analysis and mitigation

CVE-2020-2924 is a vulnerability in the MySQL Server product of Oracle MySQL, specifically affecting the Server Optimizer component. The vulnerability affects MySQL versions 8.0.19 and prior. This vulnerability was disclosed as part of Oracle's April 2020 Critical Patch Update (Oracle CPU).

The vulnerability has been assigned a CVSS 3.0 Base Score of 4.9 (Medium severity) with the following vector: CVSS:3.0/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 (CVE Mitre).

A 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 (Ubuntu Security).

The vulnerability is considered easily exploitable but requires high privileges and network access via multiple protocols. An attacker would need to have high-level access privileges to the MySQL Server to attempt exploitation (CVE Mitre).

The vulnerability has been fixed in MySQL version 8.0.20. Users are advised to upgrade to this version or later. Ubuntu has released fixes in mysql-server-8.0 version 8.0.20-0ubuntu0.20.04.1 for Ubuntu 20.04 and version 8.0.20-0ubuntu0.19.10.1 for Ubuntu 19.10 (Ubuntu Security).