Improper input validation in MySQL Server - CVE-2021-2020

Vulnerability identifier: #VU49803

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-2020

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote authenticated user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper input validation within the Server: Optimizer component in MySQL Server. A remote authenticated user can exploit this vulnerability to perform a denial of service (DoS) attack.

MySQL Server
Gentoo Linux
Fedora
community-mysql
mysql-connector-odbc
mysql

Install updates from vendor's website.

MySQL Server - update to 8.0.21
community-mysql - addressed in versions 8.0.23-1.fc32, 8.0.23-1.fc33
mysql-connector-odbc - addressed in versions 8.0.23-1.fc32, 8.0.23-1.fc33
mysql - addressed in versions 8.0-3220210504011648.43bbeeef, 8.0-3320210504011648.601d93de, 8.0-3420210504011648.058368ca

• https://www.oracle.com/security-alerts/cpujan2021.html

• Multiple vulnerabilities in MySQL Server
• Gentoo update for MySQL
• Fedora 33 update for community-mysql, mysql-connector-odbc
• Fedora 32 update for community-mysql, mysql-connector-odbc
• Fedora 33 Modular update for mysql
• Fedora 32 Modular update for mysql
• Fedora 34 Modular update for mysql