CVE-2020-14623: 
MySQL vulnerability analysis and mitigation

CVE-2020-14623 is a vulnerability discovered in the MySQL Server product of Oracle MySQL, specifically affecting the InnoDB component. The vulnerability affects MySQL versions 8.0.20 and prior. This vulnerability was disclosed as part of Oracle's July 2020 Critical Patch Update (Oracle CPU).

The vulnerability is classified as an easily exploitable vulnerability that allows high privileged attackers with network access via multiple protocols to compromise MySQL Server. 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 (CVE Mitre).

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 the availability of the system, with no impact on confidentiality or integrity (NetApp Advisory).

The vulnerability requires a high-privileged attacker with network access. The attack complexity is considered low, requiring no user interaction to exploit. The vulnerability can be accessed through multiple protocols (Ubuntu Security).

The vulnerability has been fixed in MySQL version 8.0.21. Users are advised to upgrade to this version or later. For Ubuntu systems, the fixed versions are: Ubuntu 20.04 LTS (mysql-server-8.0 - 8.0.21-0ubuntu0.20.04.3), Ubuntu 18.04 LTS (mysql-server-5.7 - 5.7.31-0ubuntu0.18.04.1), and Ubuntu 16.04 LTS (mysql-server-5.7 - 5.7.31-0ubuntu0.16.04.1) (Ubuntu Notice).