Improper input validation in MySQL Server - CVE-2025-21521

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Main Vulnerability Database Vulnerabilities #VU103175

Improper input validation in MySQL Server - CVE-2025-21521

Published: January 21, 2025


Vulnerability identifier: #VU103175
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-21521
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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

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


Affected software

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
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
mecab
mecab-ipadic
mecab-ipadic-EUCJP
mysql (Red Hat package)
mysql-common
mysql-test
mysql-server
mysql-libs
mysql-errmsg
mysql-devel
mysql
Dell EMC Storage Monitoring and Reporting (SMR)
Storage Resource Manager

How to mitigate CVE-2025-21521

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
Dell EMC Storage Monitoring and Reporting (SMR) - addressed in versions 5.0.2.2, 5.1.0.0
Storage Resource Manager - addressed in versions 5.0.2.2, 5.1.0.0
mysql (Red Hat package) - addressed in versions 8.0.40-1.el9_2.1, 8.0.40-1.el9_4, 8.0.40-2.el9_0, 8.0.41-2.el9_5
mysql-common - update to 8.0.41-1.0.1
mysql-test - update to 8.0.41-1.0.1
mysql-server - update to 8.0.41-1.0.1
mysql-libs - update to 8.0.41-1.0.1
mysql-errmsg - update to 8.0.41-1.0.1
mysql-devel - update to 8.0.41-1.0.1
mysql - update to 8.0.41-1.0.1

External References

Related Security Bulletins