# CVE-2023-21963: libmysqlclient21: Vulnerability in the MySQL Server product of Oracle MySQL (component:Server: Connection Handling) CVE-2023-21963 is fixed in 28 products on 1 platform, first by libmysqlclient20 5.7.41-0ubuntu0.18.04.1, released April 18, 2023. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2023-21963 - Priority: High - CVSS: 7.5 (Medium) - EPSS: 0.0100 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Apr 18, 2023 ## Description Vulnerability in the MySQL Server product of Oracle MySQL (component:Server: Connection Handling). Supported versions that are affected are5.7.40 and prior and 8.0.31 and prior. Easily exploitable vulnerabilityallows high privileged attacker with network access via multiple protocolsto compromise MySQL Server. Successful attacks of this vulnerability canresult in unauthorized ability to cause a partial denial of service(partial DOS) of MySQL Server. CVSS 3.1 Base Score 2.7 (Availabilityimpacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L). ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libmysqlclient20 Ubuntu 18.04.6 LTS (bionic) | 5.7.41-0ubuntu0.18.04.1 | [libmysqlclient20 5.7.41-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libmysqlclient20-5.7.41-0ubuntu0.18.04.1.md) | Apr 18, 2023 | | Linux | libmysqlclient21 Ubuntu 20.04 LTS (focal) | 8.0.32-0buntu0.20.04.1 | [libmysqlclient21 8.0.32-0buntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libmysqlclient21-8.0.32-0buntu0.20.04.1.md) | Oct 17, 2023 | | Linux | libmysqlclient21 Ubuntu 22.04.1 LTS (jammy) | 8.0.32-0buntu0.22.04.1 | [libmysqlclient21 8.0.32-0buntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libmysqlclient21-8.0.32-0buntu0.22.04.1.md) | Oct 17, 2023 | | Linux | libmysqlclient21 Ubuntu 24.10 (oracular) | 8.0.32-0ubuntu2 | [libmysqlclient21 8.0.32-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libmysqlclient21-8.0.32-0ubuntu2.md) | Jan 16, 2026 | | Linux | mecab RHEL 8 | 0:0.996-2.module+el8.8.0+18436+8918dd75 | [RHSA-2023:3087](https://patchblox.com/security/data/fix/linux/rhsa-2023-3087.md) | May 16, 2023 | | Linux | mecab almalinux 8 | 0.996-2.module_el8.6.0+3340+d764b636 | [ALSA-2023:3087](https://patchblox.com/security/data/fix/linux/alsa-2023-3087.md) | May 16, 2023 | | Linux | mecab rocky 8 | 0:0.996-2.module+el8.10.0+1676+9b4b6e24 | [RLSA-2023:3087](https://patchblox.com/security/data/fix/linux/rlsa-2023-3087.md) | Jun 28, 2026 | | Linux | mecab-devel RHEL 8 | 0:0.996-2.module+el8.8.0+18436+8918dd75 | [RHSA-2023:3087](https://patchblox.com/security/data/fix/linux/rhsa-2023-3087.md) | May 16, 2023 | | Linux | mecab-devel almalinux 8 | 0.996-2.module_el8.6.0+3340+d764b636 | [ALSA-2023:3087](https://patchblox.com/security/data/fix/linux/alsa-2023-3087.md) | May 16, 2023 | | Linux | mecab-ipadic RHEL 8 | 0:2.7.0.20070801-16.module+el8.0.0+3898+e09bb8de | [RHSA-2023:3087](https://patchblox.com/security/data/fix/linux/rhsa-2023-3087.md) | May 16, 2023 | | Linux | mecab-ipadic almalinux 8 | 2.7.0.20070801-16.module_el8.6.0+3340+d764b636 | [ALSA-2023:3087](https://patchblox.com/security/data/fix/linux/alsa-2023-3087.md) | May 16, 2023 | | Linux | mecab-ipadic rocky 8 | 0:2.7.0.20070801-16.module+el8.10.0+1676+9b4b6e24 | [RLSA-2023:3087](https://patchblox.com/security/data/fix/linux/rlsa-2023-3087.md) | Jun 28, 2026 | | Linux | mecab-ipadic-EUCJP RHEL 8 | 0:2.7.0.20070801-16.module+el8.0.0+3898+e09bb8de | [RHSA-2023:3087](https://patchblox.com/security/data/fix/linux/rhsa-2023-3087.md) | May 16, 2023 | | Linux | mecab-ipadic-EUCJP almalinux 8 | 2.7.0.20070801-16.module_el8.6.0+3340+d764b636 | [ALSA-2023:3087](https://patchblox.com/security/data/fix/linux/alsa-2023-3087.md) | May 16, 2023 | | Linux | mysql RHEL 8 | 0:8.0.32-1.module+el8.8.0+18446+fca6280e | [RHSA-2023:3087](https://patchblox.com/security/data/fix/linux/rhsa-2023-3087.md) | May 16, 2023 | | Linux | mysql RHEL 9 | 0:8.0.32-1.el9_2 | [RHSA-2023:2621](https://patchblox.com/security/data/fix/linux/rhsa-2023-2621.md) | May 9, 2023 | | Linux | mysql almalinux 8 | 8.0.32-1.module_el8.8.0+3567+56a616e4 | [ALSA-2023:3087](https://patchblox.com/security/data/fix/linux/alsa-2023-3087.md) | May 16, 2023 | | Linux | mysql-client Ubuntu 18.04.6 LTS (bionic) | 5.7.41-0ubuntu0.18.04.1 | [mysql-client 5.7.41-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-mysql-client-5.7.41-0ubuntu0.18.04.1.md) | Apr 18, 2023 | | Linux | mysql-client Ubuntu 20.04 LTS (focal) | 8.0.32-0buntu0.20.04.1 | [mysql-client 8.0.32-0buntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-client-8.0.32-0buntu0.20.04.1.md) | Oct 17, 2023 | | Linux | mysql-client Ubuntu 22.04.1 LTS (jammy) | 8.0.32-0buntu0.22.04.1 | [mysql-client 8.0.32-0buntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-client-8.0.32-0buntu0.22.04.1.md) | Oct 17, 2023 | | Linux | mysql-client Ubuntu 24.10 (oracular) | 8.0.32-0ubuntu2 | [mysql-client 8.0.32-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-client-8.0.32-0ubuntu2.md) | Jan 16, 2026 | | Linux | mysql-client-5.7 Ubuntu 18.04.6 LTS (bionic) | 5.7.41-0ubuntu0.18.04.1 | [mysql-client-5.7 5.7.41-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-mysql-client-5.7-5.7.41-0ubuntu0.18.04.1.md) | Apr 18, 2023 | | Linux | mysql-client-8.0 Ubuntu 20.04 LTS (focal) | 8.0.32-0buntu0.20.04.1 | [mysql-client-8.0 8.0.32-0buntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-client-8.0-8.0.32-0buntu0.20.04.1.md) | Oct 17, 2023 | | Linux | mysql-client-8.0 Ubuntu 22.04.1 LTS (jammy) | 8.0.32-0buntu0.22.04.1 | [mysql-client-8.0 8.0.32-0buntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-client-8.0-8.0.32-0buntu0.22.04.1.md) | Oct 17, 2023 | | Linux | mysql-client-8.0 Ubuntu 24.10 (oracular) | 8.0.32-0ubuntu2 | [mysql-client-8.0 8.0.32-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-client-8.0-8.0.32-0ubuntu2.md) | Jan 16, 2026 | | Linux | mysql-client-core-5.7 Ubuntu 18.04.6 LTS (bionic) | 5.7.41-0ubuntu0.18.04.1 | [mysql-client-core-5.7 5.7.41-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-mysql-client-core-5.7-5.7.41-0ubuntu0.18.04.1.md) | Apr 18, 2023 | | Linux | mysql-client-core-8.0 Ubuntu 20.04 LTS (focal) | 8.0.32-0buntu0.20.04.1 | [mysql-client-core-8.0 8.0.32-0buntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-client-core-8.0-8.0.32-0buntu0.20.04.1.md) | Oct 17, 2023 | | Linux | mysql-client-core-8.0 Ubuntu 22.04.1 LTS (jammy) | 8.0.32-0buntu0.22.04.1 | [mysql-client-core-8.0 8.0.32-0buntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-client-core-8.0-8.0.32-0buntu0.22.04.1.md) | Oct 17, 2023 | | Linux | mysql-client-core-8.0 Ubuntu 24.10 (oracular) | 8.0.32-0ubuntu2 | [mysql-client-core-8.0 8.0.32-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-client-core-8.0-8.0.32-0ubuntu2.md) | Jan 16, 2026 | | Linux | mysql-common RHEL 8 | 0:8.0.32-1.module+el8.8.0+18446+fca6280e | [RHSA-2023:3087](https://patchblox.com/security/data/fix/linux/rhsa-2023-3087.md) | May 16, 2023 | | Linux | mysql-common RHEL 9 | 0:8.0.32-1.el9_2 | [RHSA-2023:2621](https://patchblox.com/security/data/fix/linux/rhsa-2023-2621.md) | May 9, 2023 | | Linux | mysql-common almalinux 8 | 8.0.32-1.module_el8.8.0+3567+56a616e4 | [ALSA-2023:3087](https://patchblox.com/security/data/fix/linux/alsa-2023-3087.md) | May 16, 2023 | | Linux | mysql-devel RHEL 8 | 0:8.0.32-1.module+el8.8.0+18446+fca6280e | [RHSA-2023:3087](https://patchblox.com/security/data/fix/linux/rhsa-2023-3087.md) | May 16, 2023 | | Linux | mysql-devel RHEL 9 | 0:8.0.32-1.el9_2 | [RHSA-2023:2621](https://patchblox.com/security/data/fix/linux/rhsa-2023-2621.md) | May 9, 2023 | | Linux | mysql-devel almalinux 8 | 8.0.32-1.module_el8.8.0+3567+56a616e4 | [ALSA-2023:3087](https://patchblox.com/security/data/fix/linux/alsa-2023-3087.md) | May 16, 2023 | | Linux | mysql-errmsg RHEL 8 | 0:8.0.32-1.module+el8.8.0+18446+fca6280e | [RHSA-2023:3087](https://patchblox.com/security/data/fix/linux/rhsa-2023-3087.md) | May 16, 2023 | | Linux | mysql-errmsg RHEL 9 | 0:8.0.32-1.el9_2 | [RHSA-2023:2621](https://patchblox.com/security/data/fix/linux/rhsa-2023-2621.md) | May 9, 2023 | | Linux | mysql-errmsg almalinux 8 | 8.0.32-1.module_el8.8.0+3567+56a616e4 | [ALSA-2023:3087](https://patchblox.com/security/data/fix/linux/alsa-2023-3087.md) | May 16, 2023 | | Linux | mysql-libs RHEL 8 | 0:8.0.32-1.module+el8.8.0+18446+fca6280e | [RHSA-2023:3087](https://patchblox.com/security/data/fix/linux/rhsa-2023-3087.md) | May 16, 2023 | | Linux | mysql-libs RHEL 9 | 0:8.0.32-1.el9_2 | [RHSA-2023:2621](https://patchblox.com/security/data/fix/linux/rhsa-2023-2621.md) | May 9, 2023 | | Linux | mysql-libs almalinux 8 | 8.0.32-1.module_el8.8.0+3567+56a616e4 | [ALSA-2023:3087](https://patchblox.com/security/data/fix/linux/alsa-2023-3087.md) | May 16, 2023 | | Linux | mysql-router Ubuntu 20.04 LTS (focal) | 8.0.32-0buntu0.20.04.1 | [mysql-router 8.0.32-0buntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-router-8.0.32-0buntu0.20.04.1.md) | Oct 17, 2023 | | Linux | mysql-router Ubuntu 22.04.1 LTS (jammy) | 8.0.32-0buntu0.22.04.1 | [mysql-router 8.0.32-0buntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-router-8.0.32-0buntu0.22.04.1.md) | Oct 17, 2023 | | Linux | mysql-router Ubuntu 24.10 (oracular) | 8.0.32-0ubuntu2 | [mysql-router 8.0.32-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-router-8.0.32-0ubuntu2.md) | Jan 16, 2026 | | Linux | mysql-server RHEL 8 | 0:8.0.32-1.module+el8.8.0+18446+fca6280e | [RHSA-2023:3087](https://patchblox.com/security/data/fix/linux/rhsa-2023-3087.md) | May 16, 2023 | | Linux | mysql-server RHEL 9 | 0:8.0.32-1.el9_2 | [RHSA-2023:2621](https://patchblox.com/security/data/fix/linux/rhsa-2023-2621.md) | May 9, 2023 | | Linux | mysql-server Ubuntu 18.04.6 LTS (bionic) | 5.7.41-0ubuntu0.18.04.1 | [mysql-server 5.7.41-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-mysql-server-5.7.41-0ubuntu0.18.04.1.md) | Apr 18, 2023 | | Linux | mysql-server Ubuntu 20.04 LTS (focal) | 8.0.32-0buntu0.20.04.1 | [mysql-server 8.0.32-0buntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-server-8.0.32-0buntu0.20.04.1.md) | Oct 17, 2023 | | Linux | mysql-server Ubuntu 22.04.1 LTS (jammy) | 8.0.32-0buntu0.22.04.1 | [mysql-server 8.0.32-0buntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-server-8.0.32-0buntu0.22.04.1.md) | Oct 17, 2023 | | Linux | mysql-server Ubuntu 24.10 (oracular) | 8.0.32-0ubuntu2 | [mysql-server 8.0.32-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-server-8.0.32-0ubuntu2.md) | Jan 16, 2026 | | Linux | mysql-server almalinux 8 | 8.0.32-1.module_el8.8.0+3567+56a616e4 | [ALSA-2023:3087](https://patchblox.com/security/data/fix/linux/alsa-2023-3087.md) | May 16, 2023 | | Linux | mysql-server-5.7 Ubuntu 18.04.6 LTS (bionic) | 5.7.41-0ubuntu0.18.04.1 | [mysql-server-5.7 5.7.41-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-mysql-server-5.7-5.7.41-0ubuntu0.18.04.1.md) | Apr 18, 2023 | | Linux | mysql-server-8.0 Ubuntu 20.04 LTS (focal) | 8.0.32-0buntu0.20.04.1 | [mysql-server-8.0 8.0.32-0buntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-server-8.0-8.0.32-0buntu0.20.04.1.md) | Oct 17, 2023 | | Linux | mysql-server-8.0 Ubuntu 22.04.1 LTS (jammy) | 8.0.32-0buntu0.22.04.1 | [mysql-server-8.0 8.0.32-0buntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-server-8.0-8.0.32-0buntu0.22.04.1.md) | Oct 17, 2023 | | Linux | mysql-server-8.0 Ubuntu 24.10 (oracular) | 8.0.32-0ubuntu2 | [mysql-server-8.0 8.0.32-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-server-8.0-8.0.32-0ubuntu2.md) | Jan 16, 2026 | | Linux | mysql-server-core-5.7 Ubuntu 18.04.6 LTS (bionic) | 5.7.41-0ubuntu0.18.04.1 | [mysql-server-core-5.7 5.7.41-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-mysql-server-core-5.7-5.7.41-0ubuntu0.18.04.1.md) | Apr 18, 2023 | | Linux | mysql-server-core-8.0 Ubuntu 20.04 LTS (focal) | 8.0.32-0buntu0.20.04.1 | [mysql-server-core-8.0 8.0.32-0buntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-server-core-8.0-8.0.32-0buntu0.20.04.1.md) | Oct 17, 2023 | | Linux | mysql-server-core-8.0 Ubuntu 22.04.1 LTS (jammy) | 8.0.32-0buntu0.22.04.1 | [mysql-server-core-8.0 8.0.32-0buntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-server-core-8.0-8.0.32-0buntu0.22.04.1.md) | Oct 17, 2023 | | Linux | mysql-server-core-8.0 Ubuntu 24.10 (oracular) | 8.0.32-0ubuntu2 | [mysql-server-core-8.0 8.0.32-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-server-core-8.0-8.0.32-0ubuntu2.md) | Jan 16, 2026 | | Linux | mysql-source-5.7 Ubuntu 18.04.6 LTS (bionic) | 5.7.41-0ubuntu0.18.04.1 | [mysql-source-5.7 5.7.41-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-mysql-source-5.7-5.7.41-0ubuntu0.18.04.1.md) | Apr 18, 2023 | | Linux | mysql-source-8.0 Ubuntu 20.04 LTS (focal) | 8.0.32-0buntu0.20.04.1 | [mysql-source-8.0 8.0.32-0buntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-source-8.0-8.0.32-0buntu0.20.04.1.md) | Oct 17, 2023 | | Linux | mysql-source-8.0 Ubuntu 22.04.1 LTS (jammy) | 8.0.32-0buntu0.22.04.1 | [mysql-source-8.0 8.0.32-0buntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-source-8.0-8.0.32-0buntu0.22.04.1.md) | Oct 17, 2023 | | Linux | mysql-source-8.0 Ubuntu 24.10 (oracular) | 8.0.32-0ubuntu2 | [mysql-source-8.0 8.0.32-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-source-8.0-8.0.32-0ubuntu2.md) | Jan 16, 2026 | | Linux | mysql-test RHEL 8 | 0:8.0.32-1.module+el8.8.0+18446+fca6280e | [RHSA-2023:3087](https://patchblox.com/security/data/fix/linux/rhsa-2023-3087.md) | May 16, 2023 | | Linux | mysql-test RHEL 9 | 0:8.0.32-1.el9_2 | [RHSA-2023:2621](https://patchblox.com/security/data/fix/linux/rhsa-2023-2621.md) | May 9, 2023 | | Linux | mysql-test almalinux 8 | 8.0.32-1.module_el8.8.0+3567+56a616e4 | [ALSA-2023:3087](https://patchblox.com/security/data/fix/linux/alsa-2023-3087.md) | May 16, 2023 | | Linux | mysql-testsuite Ubuntu 18.04.6 LTS (bionic) | 5.7.41-0ubuntu0.18.04.1 | [mysql-testsuite 5.7.41-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-mysql-testsuite-5.7.41-0ubuntu0.18.04.1.md) | Apr 18, 2023 | | Linux | mysql-testsuite Ubuntu 20.04 LTS (focal) | 8.0.32-0buntu0.20.04.1 | [mysql-testsuite 8.0.32-0buntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-testsuite-8.0.32-0buntu0.20.04.1.md) | Oct 17, 2023 | | Linux | mysql-testsuite Ubuntu 22.04.1 LTS (jammy) | 8.0.32-0buntu0.22.04.1 | [mysql-testsuite 8.0.32-0buntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-testsuite-8.0.32-0buntu0.22.04.1.md) | Oct 17, 2023 | | Linux | mysql-testsuite Ubuntu 24.10 (oracular) | 8.0.32-0ubuntu2 | [mysql-testsuite 8.0.32-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-testsuite-8.0.32-0ubuntu2.md) | Jan 16, 2026 | | Linux | mysql-testsuite-5.7 Ubuntu 18.04.6 LTS (bionic) | 5.7.41-0ubuntu0.18.04.1 | [mysql-testsuite-5.7 5.7.41-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-mysql-testsuite-5.7-5.7.41-0ubuntu0.18.04.1.md) | Apr 18, 2023 | | Linux | mysql-testsuite-8.0 Ubuntu 20.04 LTS (focal) | 8.0.32-0buntu0.20.04.1 | [mysql-testsuite-8.0 8.0.32-0buntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-mysql-testsuite-8.0-8.0.32-0buntu0.20.04.1.md) | Oct 17, 2023 | | Linux | mysql-testsuite-8.0 Ubuntu 22.04.1 LTS (jammy) | 8.0.32-0buntu0.22.04.1 | [mysql-testsuite-8.0 8.0.32-0buntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mysql-testsuite-8.0-8.0.32-0buntu0.22.04.1.md) | Oct 17, 2023 | | Linux | mysql-testsuite-8.0 Ubuntu 24.10 (oracular) | 8.0.32-0ubuntu2 | [mysql-testsuite-8.0 8.0.32-0ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-mysql-testsuite-8.0-8.0.32-0ubuntu2.md) | Jan 16, 2026 | --- Data as of 2026-11-08T13:06:02Z UTC. 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