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Vulnerability details: VCID-bexa-vrnu-6qfd
Vulnerability ID VCID-bexa-vrnu-6qfd
Aliases CVE-2025-21521
Summary mysql: MySQL Server: Denial of service in Thread Pooling component
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (0)
There are no known CWE.
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-21521.json
epss 0.00163 https://api.first.org/data/v1/epss?cve=CVE-2025-21521
epss 0.00163 https://api.first.org/data/v1/epss?cve=CVE-2025-21521
epss 0.00163 https://api.first.org/data/v1/epss?cve=CVE-2025-21521
epss 0.00163 https://api.first.org/data/v1/epss?cve=CVE-2025-21521
epss 0.00163 https://api.first.org/data/v1/epss?cve=CVE-2025-21521
epss 0.00163 https://api.first.org/data/v1/epss?cve=CVE-2025-21521
epss 0.00163 https://api.first.org/data/v1/epss?cve=CVE-2025-21521
epss 0.00163 https://api.first.org/data/v1/epss?cve=CVE-2025-21521
epss 0.00163 https://api.first.org/data/v1/epss?cve=CVE-2025-21521
epss 0.00163 https://api.first.org/data/v1/epss?cve=CVE-2025-21521
epss 0.00163 https://api.first.org/data/v1/epss?cve=CVE-2025-21521
epss 0.00163 https://api.first.org/data/v1/epss?cve=CVE-2025-21521
epss 0.00163 https://api.first.org/data/v1/epss?cve=CVE-2025-21521
epss 0.00163 https://api.first.org/data/v1/epss?cve=CVE-2025-21521
cvssv3.1 7.5 https://www.oracle.com/security-alerts/cpujan2025.html
ssvc Track https://www.oracle.com/security-alerts/cpujan2025.html
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-21521.json
https://api.first.org/data/v1/epss?cve=CVE-2025-21521
2339270 https://bugzilla.redhat.com/show_bug.cgi?id=2339270
cpe:2.3:a:oracle:mysql_server:8.0.39_and_prior:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:mysql_server:8.0.39_and_prior:*:*:*:*:*:*:*
cpe:2.3:a:oracle:mysql_server:8.4.2_and_prior:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:mysql_server:8.4.2_and_prior:*:*:*:*:*:*:*
cpe:2.3:a:oracle:mysql_server:9.0.1_and_prior:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:mysql_server:9.0.1_and_prior:*:*:*:*:*:*:*
cpujan2025.html https://www.oracle.com/security-alerts/cpujan2025.html
RHSA-2025:1671 https://access.redhat.com/errata/RHSA-2025:1671
RHSA-2025:1673 https://access.redhat.com/errata/RHSA-2025:1673
RHSA-2025:1755 https://access.redhat.com/errata/RHSA-2025:1755
RHSA-2025:1757 https://access.redhat.com/errata/RHSA-2025:1757
RHSA-2025:1766 https://access.redhat.com/errata/RHSA-2025:1766
RHSA-2025:1767 https://access.redhat.com/errata/RHSA-2025:1767
RHSA-2025:2882 https://access.redhat.com/errata/RHSA-2025:2882
RHSA-2025:2883 https://access.redhat.com/errata/RHSA-2025:2883
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-21521.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://www.oracle.com/security-alerts/cpujan2025.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-01-22T18:34:04Z/ Found at https://www.oracle.com/security-alerts/cpujan2025.html
Exploit Prediction Scoring System (EPSS)
Percentile 0.37362
EPSS Score 0.00163
Published At April 2, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T13:43:03.750267+00:00 RedHat Importer Import https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-21521.json 38.0.0