CVE-2021-2030: 
MySQL vulnerability analysis and mitigation

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer) affecting versions 8.0.21 and prior. This easily exploitable vulnerability allows high privileged attackers with network access via multiple protocols to compromise MySQL Server. The vulnerability was disclosed in January 2021 with CVE identifier CVE-2021-2030 (CVE Details).

The vulnerability resides in the Server Optimizer component of MySQL Server. It has been assigned a CVSS 3.1 Base Score of 4.9, indicating 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 scoring indicates that the vulnerability is network-accessible, requires low attack complexity, but needs high privileges to exploit, with no user interaction required (Oracle 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. The vulnerability only affects availability, with no impact on confidentiality or integrity (NetApp Advisory).

The vulnerability is considered easily exploitable but requires a high-privileged attacker with network access via multiple protocols to compromise MySQL Server. The attack can be conducted remotely through the network (CVE Details).

Oracle has released patches for this vulnerability in versions after 8.0.21. Users are strongly advised to upgrade to the latest version of MySQL Server. For Gentoo users, the fix is available in MySQL version 8.0.24 or later (Gentoo Advisory).