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CVE-2023-21840

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: PS). Supported...

4.9 MediumFix available

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: PS). Supported versions that are affected are 5.7.40 and prior. Easily exploitable vulnerability allows high 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 3.1 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).

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
High
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

1.15%Up 0.3 points since Jan 18, 2023
90%50%10%1%

What each source reports

CVE List Score used 4.9

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: PS). Supported versions that are affected are 5.7.40 and prior. Easily exploitable vulnerability allows high 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 3.1 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).

Record
CVE-2023-21840
CVSS 3.1
4.9 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
EUVDEUVD-2023-26006 4.9

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: PS). Supported versions that are affected are 5.7.40 and prior. Easily exploitable vulnerability allows high 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 3.1 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).

Record
EUVD-2023-26006
CVSS 3.1
4.9 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-03
GitHub AdvisoriesGHSA-jcp3-6qf5-qwcc 4.9

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: PS). Supported...

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: PS). Supported versions that are affected are 5.7.40 and prior. Easily exploitable vulnerability allows high 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 3.1 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).

Record
GHSA-jcp3-6qf5-qwcc
CVSS 3.1
4.9 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
NVD 4.9

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: PS). Supported versions that are affected are 5.7.40 and prior. Easily exploitable vulnerability allows high 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 3.1 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).

Record
CVE-2023-21840
CVSS 3.1
4.9 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSV 4.9

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: PS). Supported versions that are affected are 5.7.40 and prior. Easily exploitable vulnerability allows high 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 3.1 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).

Record
CVE-2023-21840
CVSS 3.1
4.9 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2023-21840 4.9

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: PS). Supported versions that are affected are 5.7.40 and prior. Easily exploitable vulnerability allows high 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 3.1 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).

Record
UBUNTU-CVE-2023-21840
CVSS 3.1
4.9 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVCLSA-2023-1675372579 No score

Fix CVE(s): CVE-2023-21840

  • SECURITY UPDATE: Update to 5.7.41 to fix security issues
    • CVE-2023-21840
Record
CLSA-2023-1675372579
Updated
2026-11-02
OSVUSN-5823-1 No score

mysql-5.7, mysql-8.0 vulnerabilities

Multiple security issues were discovered in MySQL and this update includes new upstream MySQL versions to fix these issues.

MySQL has been updated to 8.0.32 in Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, and Ubuntu 22.10. Ubuntu 18.04 LTS has been updated to MySQL 5.7.41.

In addition to security fixes, the updated packages contain bug fixes, new features, and possibly incompatible changes.

Please see the following for more information:

https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-41.html https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-32.html https://www.oracle.com/security-alerts/cpujan2023.html

Record
USN-5823-1
Updated
2026-11-02
OSVUSN-5823-2 No score

mysql-5.7 vulnerability

USN-5823-1 fixed a vulnerability in MySQL. This update provides the corresponding update for Ubuntu 16.04 ESM.

Original advisory details:

Multiple security issues were discovered in MySQL and this update includes new upstream MySQL versions to fix these issues.

MySQL has been updated to MySQL 5.7.41.

In addition to security fixes, the updated packages contain bug fixes, new features, and possibly incompatible changes.

Please see the following for more information:

https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-41.html https://www.oracle.com/security-alerts/cpujan2023.html

Record
USN-5823-2
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libmysqlclient-dev
TuxCare:Ubuntu:16.04
 before 5.7.41-0ubuntu0.16.04.1+tuxcare.els1
5.7.41-0ubuntu0.16.04.1+tuxcare.els1
libmysqlclient20
TuxCare:Ubuntu:16.04
 before 5.7.41-0ubuntu0.16.04.1+tuxcare.els1
5.7.41-0ubuntu0.16.04.1+tuxcare.els1
libmysqld-dev
TuxCare:Ubuntu:16.04
 before 5.7.41-0ubuntu0.16.04.1+tuxcare.els1
5.7.41-0ubuntu0.16.04.1+tuxcare.els1
mysql-client
TuxCare:Ubuntu:16.04
 before 5.7.41-0ubuntu0.16.04.1+tuxcare.els1
5.7.41-0ubuntu0.16.04.1+tuxcare.els1
mysql-client-5.7
TuxCare:Ubuntu:16.04
 before 5.7.41-0ubuntu0.16.04.1+tuxcare.els1
5.7.41-0ubuntu0.16.04.1+tuxcare.els1
mysql-client-core-5.7
TuxCare:Ubuntu:16.04
 before 5.7.41-0ubuntu0.16.04.1+tuxcare.els1
5.7.41-0ubuntu0.16.04.1+tuxcare.els1
mysql-common
TuxCare:Ubuntu:16.04
 before 5.7.41-0ubuntu0.16.04.1+tuxcare.els1
5.7.41-0ubuntu0.16.04.1+tuxcare.els1
mysql-server
TuxCare:Ubuntu:16.04
 before 5.7.41-0ubuntu0.16.04.1+tuxcare.els1
5.7.41-0ubuntu0.16.04.1+tuxcare.els1
mysql-server-5.7
TuxCare:Ubuntu:16.04
 before 5.7.41-0ubuntu0.16.04.1+tuxcare.els1
5.7.41-0ubuntu0.16.04.1+tuxcare.els1
mysql-server-core-5.7
TuxCare:Ubuntu:16.04
 before 5.7.41-0ubuntu0.16.04.1+tuxcare.els1
5.7.41-0ubuntu0.16.04.1+tuxcare.els1
Show 11 moreShow less
Affected packages
PackageAffectedFixed
mysql-source-5.7
TuxCare:Ubuntu:16.04
 before 5.7.41-0ubuntu0.16.04.1+tuxcare.els1
5.7.41-0ubuntu0.16.04.1+tuxcare.els1
mysql-testsuite
TuxCare:Ubuntu:16.04
 before 5.7.41-0ubuntu0.16.04.1+tuxcare.els1
5.7.41-0ubuntu0.16.04.1+tuxcare.els1
mysql-testsuite-5.7
TuxCare:Ubuntu:16.04
 before 5.7.41-0ubuntu0.16.04.1+tuxcare.els1
5.7.41-0ubuntu0.16.04.1+tuxcare.els1
mysql-5.5
Ubuntu:14.04:LTS
 All versions, plus listed versions
5.5.32-0ubuntu75.5.34-0ubuntu15.5.34-0ubuntu25.5.35-0ubuntu15.5.35+dfsg-1ubuntu1
Show 20 moreShow less
5.5.37-0ubuntu0.14.04.15.5.38-0ubuntu0.14.04.15.5.40-0ubuntu0.14.04.15.5.41-0ubuntu0.14.04.15.5.43-0ubuntu0.14.04.15.5.44-0ubuntu0.14.04.15.5.46-0ubuntu0.14.04.25.5.47-0ubuntu0.14.04.15.5.49-0ubuntu0.14.04.15.5.50-0ubuntu0.14.04.15.5.52-0ubuntu0.14.04.15.5.53-0ubuntu0.14.04.15.5.54-0ubuntu0.14.04.15.5.55-0ubuntu0.14.04.15.5.57-0ubuntu0.14.04.15.5.58-0ubuntu0.14.04.15.5.59-0ubuntu0.14.04.15.5.60-0ubuntu0.14.04.15.5.61-0ubuntu0.14.04.15.5.62-0ubuntu0.14.04.1
 None known
mysql-5.7
Ubuntu:Pro:16.04:LTS
 before 5.7.41-0ubuntu0.16.04.1+esm1, plus listed versions
5.7.11-0ubuntu45.7.11-0ubuntu55.7.11-0ubuntu65.7.12-0ubuntu15.7.12-0ubuntu1.1
Show 27 moreShow less
5.7.13-0ubuntu0.16.04.25.7.15-0ubuntu0.16.04.15.7.16-0ubuntu0.16.04.15.7.17-0ubuntu0.16.04.15.7.17-0ubuntu0.16.04.25.7.18-0ubuntu0.16.04.15.7.19-0ubuntu0.16.04.15.7.20-0ubuntu0.16.04.15.7.21-0ubuntu0.16.04.15.7.22-0ubuntu0.16.04.15.7.23-0ubuntu0.16.04.15.7.24-0ubuntu0.16.04.15.7.25-0ubuntu0.16.04.25.7.26-0ubuntu0.16.04.15.7.27-0ubuntu0.16.04.15.7.28-0ubuntu0.16.04.25.7.29-0ubuntu0.16.04.15.7.30-0ubuntu0.16.04.15.7.31-0ubuntu0.16.04.15.7.32-0ubuntu0.16.04.15.7.33-0ubuntu0.16.04.15.7.35-0ubuntu0.16.04.1+esm15.7.36-0ubuntu0.16.04.1+esm15.7.37-0ubuntu0.16.04.1+esm15.7.38-0ubuntu0.16.04.1+esm15.7.39-0ubuntu0.16.04.1+esm25.7.40-0ubuntu0.16.04.1+esm1
5.7.41-0ubuntu0.16.04.1+esm1
percona-server-5.6
Ubuntu:16.04:LTS
 All versions, plus listed versions
5.6.22-rel71.0-0ubuntu25.6.22-rel71.0-0ubuntu45.6.22-rel71.0-0ubuntu4.1
 None known
percona-xtradb-cluster-5.6
Ubuntu:16.04:LTS
 All versions, plus listed versions
5.6.21-25.8-0ubuntu25.6.21-25.8-0ubuntu35.6.21-25.8-0ubuntu3.15.6.21-25.8-0ubuntu3.25.6.34-26.19-0ubuntu0.16.04.15.6.34-26.19-0ubuntu0.16.04.25.6.37-26.21-0ubuntu0.16.04.15.6.37-26.21-0ubuntu0.16.04.2
 None known
mysql-5.7
Ubuntu:18.04:LTS
 before 5.7.41-0ubuntu0.18.04.1, plus listed versions
5.7.19-0ubuntu15.7.20-0ubuntu0.17.10.15.7.20-1ubuntu15.7.21-1ubuntu15.7.22-0ubuntu18.04.1
Show 19 moreShow less
5.7.23-0ubuntu0.18.04.15.7.24-0ubuntu0.18.04.15.7.25-0ubuntu0.18.04.25.7.26-0ubuntu0.18.04.15.7.27-0ubuntu0.18.04.15.7.28-0ubuntu0.18.04.45.7.29-0ubuntu0.18.04.15.7.30-0ubuntu0.18.04.15.7.31-0ubuntu0.18.04.15.7.32-0ubuntu0.18.04.15.7.33-0ubuntu0.18.04.15.7.34-0ubuntu0.18.04.15.7.35-0ubuntu0.18.04.15.7.35-0ubuntu0.18.04.25.7.36-0ubuntu0.18.04.15.7.37-0ubuntu0.18.04.15.7.38-0ubuntu0.18.04.15.7.39-0ubuntu0.18.04.25.7.40-0ubuntu0.18.04.1
5.7.41-0ubuntu0.18.04.1
mysql-5.7
Ubuntu:18.04:LTS
From an advisory covering 20 CVEs
 before 5.7.41-0ubuntu0.18.04.1, plus listed versions
5.7.19-0ubuntu15.7.20-0ubuntu0.17.10.15.7.20-1ubuntu15.7.21-1ubuntu15.7.22-0ubuntu18.04.1
Show 19 moreShow less
5.7.23-0ubuntu0.18.04.15.7.24-0ubuntu0.18.04.15.7.25-0ubuntu0.18.04.25.7.26-0ubuntu0.18.04.15.7.27-0ubuntu0.18.04.15.7.28-0ubuntu0.18.04.45.7.29-0ubuntu0.18.04.15.7.30-0ubuntu0.18.04.15.7.31-0ubuntu0.18.04.15.7.32-0ubuntu0.18.04.15.7.33-0ubuntu0.18.04.15.7.34-0ubuntu0.18.04.15.7.35-0ubuntu0.18.04.15.7.35-0ubuntu0.18.04.25.7.36-0ubuntu0.18.04.15.7.37-0ubuntu0.18.04.15.7.38-0ubuntu0.18.04.15.7.39-0ubuntu0.18.04.25.7.40-0ubuntu0.18.04.1
5.7.41-0ubuntu0.18.04.1
mysql-8.0
Ubuntu:20.04:LTS
From an advisory covering 20 CVEs
 before 8.0.32-0buntu0.20.04.1, plus listed versions
8.0.17-0ubuntu28.0.17-0ubuntu38.0.18-0ubuntu38.0.18-0ubuntu48.0.18-0ubuntu5
Show 20 moreShow less
8.0.19-0ubuntu28.0.19-0ubuntu38.0.19-0ubuntu48.0.19-0ubuntu58.0.20-0ubuntu0.20.04.18.0.21-0ubuntu0.20.04.38.0.21-0ubuntu0.20.04.48.0.22-0ubuntu0.20.04.28.0.22-0ubuntu0.20.04.38.0.23-0ubuntu0.20.04.18.0.25-0ubuntu0.20.04.18.0.26-0ubuntu0.20.04.28.0.26-0ubuntu0.20.04.38.0.27-0ubuntu0.20.04.18.0.28-0ubuntu0.20.04.38.0.29-0ubuntu0.20.04.28.0.29-0ubuntu0.20.04.38.0.30-0ubuntu0.20.04.28.0.31-0ubuntu0.20.04.18.0.31-0ubuntu0.20.04.2
8.0.32-0buntu0.20.04.1
mysql-8.0
Ubuntu:22.04:LTS
From an advisory covering 20 CVEs
 before 8.0.32-0buntu0.22.04.1, plus listed versions
8.0.26-0ubuntu18.0.27-0ubuntu0.21.10.18.0.28-0ubuntu38.0.28-0ubuntu48.0.29-0ubuntu0.22.04.1
Show 4 moreShow less
8.0.29-0ubuntu0.22.04.28.0.29-0ubuntu0.22.04.38.0.30-0ubuntu0.22.04.18.0.31-0ubuntu0.22.04.1
8.0.32-0buntu0.22.04.1

History

History
RecordedChangedSources
affected, facts
aliases, publishedEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-21840 is a medium vulnerability (CVSS 4.9) in Oracle Mysql Server, published January 17, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.15%, the 66th percentile. Fixed in libmysqlclient-dev 5.7.41-0ubuntu0.16.04.1+tuxcare.els1.

References

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