CVE-2020-14786: 
MySQL vulnerability analysis and mitigation

CVE-2020-14786 is a vulnerability discovered in Oracle MySQL Server (component: Server: PS) affecting versions 8.0.21 and prior. The vulnerability was disclosed on October 21, 2020, as part of Oracle's Critical Patch Update (Oracle CPU).

This is 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) with the following vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H (NVD, NetApp Advisory).

Successful exploitation of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash, leading to a complete Denial of Service (DoS) of MySQL Server (NVD, NetApp Advisory).

The vulnerability requires a high-privileged attacker with network access. The attack complexity is considered low, requiring no user interaction to exploit, though it does require high privileges to execute (NetApp Advisory).

Oracle has released patches to address this vulnerability in MySQL version 8.0.22. Users are strongly recommended to upgrade to this version or apply the relevant security patches. Various distributions have also released fixed versions, including Fedora 31, 32, and 33 with community-mysql-8.0.22-1 (Fedora Update).