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CVE-2025-21497: Vulnerability in the MySQL Server product of Oracle MySQL (component: InnoDB). Supported versions that are affected are 8.0.40 and prior, 8.4.3 and prior and 9.1.0 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 as well as unau

mediumCVSS 5.5CVE-2025-21497

CSIRTS triage

vendor: Oracleproduct: MySQL ServerPrivilege escalationaffected: 8.0.40 and prior, 8.4.3 and prior, 9.1.0 and prior
What
Vulnerability in InnoDB component allowing high-privileged attacker to cause unspecified impact via multiple protocols.
Who is affected
MySQL Server deployments version 8.0.40, 8.4.3, or 9.1.0 and earlier accessible via network.
Urgency
Medium severity (CVSS 5.5) requiring high privilege but affecting core database; apply promptly.
Action
Upgrade MySQL Server to versions after 8.0.40, 8.4.3, or 9.1.0 respectively.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 5.5
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21497

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-21497coverage & exploitation statusNVD · CVE.org

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