Improper input validation in MySQL Server - CVE-2025-21494

Vulnerability identifier: #VU103204

CSH Severity: Low

CVSS v4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-21494

CWE-ID: CWE-20

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to perform a denial of service (DoS) attack.

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

MySQL Server
Anolis OS
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
mecab
mecab-ipadic
mecab-ipadic-EUCJP
mysql
mysql-common
mysql-devel
mysql-errmsg
mysql-libs
mysql-server
mysql-test
mysql (Red Hat package)

Install updates from vendor's website.

MySQL Server - addressed in versions 8.0.40, 8.4.3
mecab - update to 0.996-2
mecab-ipadic - update to 2.7.0.20070801-17.0.1
mecab-ipadic-EUCJP - update to 2.7.0.20070801-17.0.1
mysql - update to 8.0.41-1.0.1
mysql-common - update to 8.0.41-1.0.1
mysql-devel - update to 8.0.41-1.0.1
mysql-errmsg - update to 8.0.41-1.0.1
mysql-libs - update to 8.0.41-1.0.1
mysql-server - update to 8.0.41-1.0.1
mysql-test - update to 8.0.41-1.0.1
mysql (Red Hat package) - update to 8.0.41-2.el9_5

• https://www.oracle.com/security-alerts/cpujan2025.html

• Multiple vulnerabilities in MySQL Server
• Red Hat Enterprise Linux 9 update for mysql
• Red Hat Enterprise Linux 8 update for the mysql:8.0 module
• Anolis OS update for mysql:8.0 module