CVE-2018-2668: Medium severity Oracle MySQL vulnerability
Last updated 18 August 2025
Other sources
Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: Optimizer). Supported versions that are affected are 5.5.58 and prior, 5.6.38 and prior and 5.7.20 and prior. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server.
External References:
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
— Red Hat
Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: Optimizer). Supported versions that are affected are 5.5.58 and prior, 5.6.38 and prior and 5.7.20 and prior. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.0 Base Score 6.5 (Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
— Launchpad
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2018-2668?
CVE-2018-2668 is considered to be easily exploitable, allowing low privileged attackers to exploit the vulnerability.
How do I fix CVE-2018-2668?
To remediate CVE-2018-2668, upgrade to MySQL versions 5.5.59, 5.6.39, or 5.7.21 or higher.
Which MySQL versions are affected by CVE-2018-2668?
Affected MySQL versions include 5.5.58 and prior, 5.6.38 and prior, and 5.7.20 and prior.
Is MariaDB affected by CVE-2018-2668?
Yes, MariaDB versions prior to 5.5.59, 10.0.34, 10.1.31, and 10.2.13 are also affected by CVE-2018-2668.
What systems are vulnerable to CVE-2018-2668?
CVE-2018-2668 impacts systems running affected versions of MySQL and MariaDB, particularly on Red Hat, Debian, and Ubuntu distributions.