# CVE-2021-2425: libmysqlclient21: Vulnerability in the MySQL Server product of Oracle MySQL (component:Server: Optimizer)

CVE-2021-2425 is fixed in 20 products on 1 platform, first by RHSA-2021:3590, released September 21, 2021. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-2425
- Priority: Routine
- CVSS: 4.9 (Medium)
- EPSS: 0.0211
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 21, 2021

## Description

Vulnerability in the MySQL Server product of Oracle MySQL (component:Server: Optimizer). Supported versions that are affected are 8.0.25 andprior. Easily exploitable vulnerability allows high privileged attackerwith network access via multiple protocols to compromise MySQL Server.Successful attacks of this vulnerability can result in unauthorized abilityto cause a hang or frequently repeatable crash (complete DOS) of MySQLServer. CVSS 3.1 Base Score 4.9 (Availability impacts). CVSS Vector:(CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libmysqlclient21 Ubuntu 20.04 LTS (focal) | 8.0.26-0ubuntu0.20.04.2 | [libmysqlclient21 8.0.26-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libmysqlclient21-8.0.26-0ubuntu0.20.04.2.md) | Oct 20, 2021 |
| Linux | libmysqlclient21 Ubuntu 22.04.1 LTS (jammy) | 8.0.26-0ubuntu1 | [libmysqlclient21 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libmysqlclient21-8.0.26-0ubuntu1.md) | Jul 15, 2025 |
| Linux | libmysqlclient21 Ubuntu 24.10 (oracular) | 8.0.26-0ubuntu1 | [libmysqlclient21 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libmysqlclient21-8.0.26-0ubuntu1.md) | Jan 16, 2026 |
| Linux | mecab RHEL 8 | 0:0.996-1.module+el8.0.0+3898+e09bb8de.9 | [RHSA-2021:3590](https://patchblox.com/security/data/fix/linux/rhsa-2021-3590.md) | Sep 21, 2021 |
| Linux | mecab ol 8 | 0:0.996-1.module+el8.0.0+5253+1dce7bb2.9 | [ELSA-2021-3590](https://patchblox.com/security/data/fix/linux/elsa-2021-3590.md) | Sep 23, 2021 |
| Linux | mecab-ipadic RHEL 8 | 0:2.7.0.20070801-16.module+el8.0.0+3898+e09bb8de | [RHSA-2021:3590](https://patchblox.com/security/data/fix/linux/rhsa-2021-3590.md) | Sep 21, 2021 |
| Linux | mecab-ipadic ol 8 | 0:2.7.0.20070801-16.0.1.module+el8.0.0+5253+1dce7bb2 | [ELSA-2021-3590](https://patchblox.com/security/data/fix/linux/elsa-2021-3590.md) | Sep 23, 2021 |
| Linux | mecab-ipadic-EUCJP RHEL 8 | 0:2.7.0.20070801-16.module+el8.0.0+3898+e09bb8de | [RHSA-2021:3590](https://patchblox.com/security/data/fix/linux/rhsa-2021-3590.md) | Sep 21, 2021 |
| Linux | mecab-ipadic-EUCJP ol 8 | 0:2.7.0.20070801-16.0.1.module+el8.0.0+5253+1dce7bb2 | [ELSA-2021-3590](https://patchblox.com/security/data/fix/linux/elsa-2021-3590.md) | Sep 23, 2021 |
| Linux | mysql RHEL 8 | 0:8.0.26-1.module+el8.4.0+12359+b8928c02 | [RHSA-2021:3590](https://patchblox.com/security/data/fix/linux/rhsa-2021-3590.md) | Sep 21, 2021 |
| Linux | mysql ol 8 | 0:8.0.26-1.module+el8.4.0+20311+30d12931 | [ELSA-2021-3590](https://patchblox.com/security/data/fix/linux/elsa-2021-3590.md) | Sep 23, 2021 |
| Linux | mysql-client Ubuntu 20.04 LTS (focal) | 8.0.26-0ubuntu0.20.04.2 | [mysql-client 8.0.26-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-client-8.0.26-0ubuntu0.20.04.2.md) | Oct 20, 2021 |
| Linux | mysql-client Ubuntu 22.04.1 LTS (jammy) | 8.0.26-0ubuntu1 | [mysql-client 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-client-8.0.26-0ubuntu1.md) | Jul 15, 2025 |
| Linux | mysql-client Ubuntu 24.10 (oracular) | 8.0.26-0ubuntu1 | [mysql-client 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-client-8.0.26-0ubuntu1.md) | Jan 16, 2026 |
| Linux | mysql-client-8.0 Ubuntu 20.04 LTS (focal) | 8.0.26-0ubuntu0.20.04.2 | [mysql-client-8.0 8.0.26-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-client-8.0-8.0.26-0ubuntu0.20.04.2.md) | Oct 20, 2021 |
| Linux | mysql-client-8.0 Ubuntu 22.04.1 LTS (jammy) | 8.0.26-0ubuntu1 | [mysql-client-8.0 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-client-8.0-8.0.26-0ubuntu1.md) | Jul 15, 2025 |
| Linux | mysql-client-8.0 Ubuntu 24.10 (oracular) | 8.0.26-0ubuntu1 | [mysql-client-8.0 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-client-8.0-8.0.26-0ubuntu1.md) | Jan 16, 2026 |
| Linux | mysql-client-core-8.0 Ubuntu 20.04 LTS (focal) | 8.0.26-0ubuntu0.20.04.2 | [mysql-client-core-8.0 8.0.26-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-client-core-8.0-8.0.26-0ubuntu0.20.04.2.md) | Oct 20, 2021 |
| Linux | mysql-client-core-8.0 Ubuntu 22.04.1 LTS (jammy) | 8.0.26-0ubuntu1 | [mysql-client-core-8.0 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-client-core-8.0-8.0.26-0ubuntu1.md) | Jul 15, 2025 |
| Linux | mysql-client-core-8.0 Ubuntu 24.10 (oracular) | 8.0.26-0ubuntu1 | [mysql-client-core-8.0 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-client-core-8.0-8.0.26-0ubuntu1.md) | Jan 16, 2026 |
| Linux | mysql-common RHEL 8 | 0:8.0.26-1.module+el8.4.0+12359+b8928c02 | [RHSA-2021:3590](https://patchblox.com/security/data/fix/linux/rhsa-2021-3590.md) | Sep 21, 2021 |
| Linux | mysql-common ol 8 | 0:8.0.26-1.module+el8.4.0+20311+30d12931 | [ELSA-2021-3590](https://patchblox.com/security/data/fix/linux/elsa-2021-3590.md) | Sep 23, 2021 |
| Linux | mysql-devel RHEL 8 | 0:8.0.26-1.module+el8.4.0+12359+b8928c02 | [RHSA-2021:3590](https://patchblox.com/security/data/fix/linux/rhsa-2021-3590.md) | Sep 21, 2021 |
| Linux | mysql-devel ol 8 | 0:8.0.26-1.module+el8.4.0+20311+30d12931 | [ELSA-2021-3590](https://patchblox.com/security/data/fix/linux/elsa-2021-3590.md) | Sep 23, 2021 |
| Linux | mysql-errmsg RHEL 8 | 0:8.0.26-1.module+el8.4.0+12359+b8928c02 | [RHSA-2021:3590](https://patchblox.com/security/data/fix/linux/rhsa-2021-3590.md) | Sep 21, 2021 |
| Linux | mysql-errmsg ol 8 | 0:8.0.26-1.module+el8.4.0+20311+30d12931 | [ELSA-2021-3590](https://patchblox.com/security/data/fix/linux/elsa-2021-3590.md) | Sep 23, 2021 |
| Linux | mysql-libs RHEL 8 | 0:8.0.26-1.module+el8.4.0+12359+b8928c02 | [RHSA-2021:3590](https://patchblox.com/security/data/fix/linux/rhsa-2021-3590.md) | Sep 21, 2021 |
| Linux | mysql-libs ol 8 | 0:8.0.26-1.module+el8.4.0+20311+30d12931 | [ELSA-2021-3590](https://patchblox.com/security/data/fix/linux/elsa-2021-3590.md) | Sep 23, 2021 |
| Linux | mysql-router Ubuntu 20.04 LTS (focal) | 8.0.26-0ubuntu0.20.04.2 | [mysql-router 8.0.26-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-router-8.0.26-0ubuntu0.20.04.2.md) | Oct 20, 2021 |
| Linux | mysql-router Ubuntu 22.04.1 LTS (jammy) | 8.0.26-0ubuntu1 | [mysql-router 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-router-8.0.26-0ubuntu1.md) | Jul 15, 2025 |
| Linux | mysql-router Ubuntu 24.10 (oracular) | 8.0.26-0ubuntu1 | [mysql-router 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-router-8.0.26-0ubuntu1.md) | Jan 16, 2026 |
| Linux | mysql-server RHEL 8 | 0:8.0.26-1.module+el8.4.0+12359+b8928c02 | [RHSA-2021:3590](https://patchblox.com/security/data/fix/linux/rhsa-2021-3590.md) | Sep 21, 2021 |
| Linux | mysql-server Ubuntu 20.04 LTS (focal) | 8.0.26-0ubuntu0.20.04.2 | [mysql-server 8.0.26-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-server-8.0.26-0ubuntu0.20.04.2.md) | Oct 20, 2021 |
| Linux | mysql-server Ubuntu 22.04.1 LTS (jammy) | 8.0.26-0ubuntu1 | [mysql-server 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-server-8.0.26-0ubuntu1.md) | Jul 15, 2025 |
| Linux | mysql-server Ubuntu 24.10 (oracular) | 8.0.26-0ubuntu1 | [mysql-server 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-server-8.0.26-0ubuntu1.md) | Jan 16, 2026 |
| Linux | mysql-server ol 8 | 0:8.0.26-1.module+el8.4.0+20311+30d12931 | [ELSA-2021-3590](https://patchblox.com/security/data/fix/linux/elsa-2021-3590.md) | Sep 23, 2021 |
| Linux | mysql-server-8.0 Ubuntu 20.04 LTS (focal) | 8.0.26-0ubuntu0.20.04.2 | [mysql-server-8.0 8.0.26-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-server-8.0-8.0.26-0ubuntu0.20.04.2.md) | Oct 20, 2021 |
| Linux | mysql-server-8.0 Ubuntu 22.04.1 LTS (jammy) | 8.0.26-0ubuntu1 | [mysql-server-8.0 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-server-8.0-8.0.26-0ubuntu1.md) | Jul 15, 2025 |
| Linux | mysql-server-8.0 Ubuntu 24.10 (oracular) | 8.0.26-0ubuntu1 | [mysql-server-8.0 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-server-8.0-8.0.26-0ubuntu1.md) | Jan 16, 2026 |
| Linux | mysql-server-core-8.0 Ubuntu 20.04 LTS (focal) | 8.0.26-0ubuntu0.20.04.2 | [mysql-server-core-8.0 8.0.26-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-server-core-8.0-8.0.26-0ubuntu0.20.04.2.md) | Oct 20, 2021 |
| Linux | mysql-server-core-8.0 Ubuntu 22.04.1 LTS (jammy) | 8.0.26-0ubuntu1 | [mysql-server-core-8.0 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-server-core-8.0-8.0.26-0ubuntu1.md) | Jul 15, 2025 |
| Linux | mysql-server-core-8.0 Ubuntu 24.10 (oracular) | 8.0.26-0ubuntu1 | [mysql-server-core-8.0 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-server-core-8.0-8.0.26-0ubuntu1.md) | Jan 16, 2026 |
| Linux | mysql-source-8.0 Ubuntu 20.04 LTS (focal) | 8.0.26-0ubuntu0.20.04.2 | [mysql-source-8.0 8.0.26-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-source-8.0-8.0.26-0ubuntu0.20.04.2.md) | Oct 20, 2021 |
| Linux | mysql-source-8.0 Ubuntu 22.04.1 LTS (jammy) | 8.0.26-0ubuntu1 | [mysql-source-8.0 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-source-8.0-8.0.26-0ubuntu1.md) | Jul 15, 2025 |
| Linux | mysql-source-8.0 Ubuntu 24.10 (oracular) | 8.0.26-0ubuntu1 | [mysql-source-8.0 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-source-8.0-8.0.26-0ubuntu1.md) | Jan 16, 2026 |
| Linux | mysql-test RHEL 8 | 0:8.0.26-1.module+el8.4.0+12359+b8928c02 | [RHSA-2021:3590](https://patchblox.com/security/data/fix/linux/rhsa-2021-3590.md) | Sep 21, 2021 |
| Linux | mysql-test ol 8 | 0:8.0.26-1.module+el8.4.0+20311+30d12931 | [ELSA-2021-3590](https://patchblox.com/security/data/fix/linux/elsa-2021-3590.md) | Sep 23, 2021 |
| Linux | mysql-testsuite Ubuntu 20.04 LTS (focal) | 8.0.26-0ubuntu0.20.04.2 | [mysql-testsuite 8.0.26-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-testsuite-8.0.26-0ubuntu0.20.04.2.md) | Oct 20, 2021 |
| Linux | mysql-testsuite Ubuntu 22.04.1 LTS (jammy) | 8.0.26-0ubuntu1 | [mysql-testsuite 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-testsuite-8.0.26-0ubuntu1.md) | Jul 15, 2025 |
| Linux | mysql-testsuite Ubuntu 24.10 (oracular) | 8.0.26-0ubuntu1 | [mysql-testsuite 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-testsuite-8.0.26-0ubuntu1.md) | Jan 16, 2026 |
| Linux | mysql-testsuite-8.0 Ubuntu 20.04 LTS (focal) | 8.0.26-0ubuntu0.20.04.2 | [mysql-testsuite-8.0 8.0.26-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-testsuite-8.0-8.0.26-0ubuntu0.20.04.2.md) | Oct 20, 2021 |
| Linux | mysql-testsuite-8.0 Ubuntu 22.04.1 LTS (jammy) | 8.0.26-0ubuntu1 | [mysql-testsuite-8.0 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-testsuite-8.0-8.0.26-0ubuntu1.md) | Jul 15, 2025 |
| Linux | mysql-testsuite-8.0 Ubuntu 24.10 (oracular) | 8.0.26-0ubuntu1 | [mysql-testsuite-8.0 8.0.26-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-testsuite-8.0-8.0.26-0ubuntu1.md) | Jan 16, 2026 |

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Data as of 2026-11-07T12:40:37Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo