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CVE-2023-21963

15
FAUCET Score

CVE-2023-21963 is a vulnerability in Oracle MySQL Server's Connection Handling component, affecting versions 5.7.40 and prior, and 8.0.31 and prior. This easily exploitable flaw allows a highly privileged attacker with network access to cause a partial denial of service (DoS) of the MySQL Server. With a low CVSS score of 2.7, the impact is limited to availability, and there is no known active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 5.7.0, <= 5.7.40CPE matchmatch criteria
cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*
>= 8.0.0, <= 8.0.31CPE matchmatch criteria
cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

2.7LOW

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
1.2
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.99%
Probability of exploitation in next 30 days
EPSS Percentile
58.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0099 is in the 88th percentile among its peer group of 709 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.0 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: mysql:8.0-8080020230322094358.63b34585
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: mysql-0:8.0.32-1.el9_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: rh-mysql80-mysql-0:8.0.32-1.el7
View patch
oraclevendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2023-21963Low

mysql: Server: Connection Handling unspecified vulnerability (CPU Apr 2023)

Apr 18, 2023

References

security.netapp.com / advisory/ntap-20230427-0007
oracle.com / security-alerts/cpuapr2023.html
Vendor Advisory