CVE-2020-2686: Medium severity Oracle MySQL vulnerability
Last updated 18 August 2025
Other sources
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.18 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:
https://www.oracle.com/security-alerts/cpujan2020.html
— Red Hat
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.18 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
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
redhat/mysqlto a version that resolves this vulnerability.Fixed in 8.0.19 - Upgrade
Upgrade
Oracle MySQL Server (Optimizer)to a version that resolves this vulnerability.Fixed in 8.0.19 - Compensating control
Mitigate the availability impact by restricting network access to the MySQL Server until patched (since the vulnerability is exploitable over the network via multiple protocols).
Event History
Frequently Asked Questions
What is the severity of CVE-2020-2686?
CVE-2020-2686 is rated as an easily exploitable vulnerability allowing low privileged attackers network access.
How do I fix CVE-2020-2686?
To remediate CVE-2020-2686, upgrade MySQL Server to version 8.0.19 or later.
Which versions of MySQL are affected by CVE-2020-2686?
MySQL versions 8.0.18 and prior are affected by CVE-2020-2686.
Can CVE-2020-2686 be exploited remotely?
Yes, CVE-2020-2686 can be exploited by an attacker with network access via multiple protocols.
What components of MySQL are affected by CVE-2020-2686?
CVE-2020-2686 affects the MySQL Server component, specifically its optimizer.