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CVE-2025-21567: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Security: Privileges). Supported versions that are affected are 9.1.0 and prior. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized read access to a subset of MySQL Server accessible data. CVSS 3.1 Base Score 4.3 (Confidentiality impacts). CVSS Vecto

mediumCVSS 4.3CVE-2025-21567

CSIRTS triage

vendor: Oracleproduct: MySQL ServerAuthentication bypassPrivilege escalationaffected: 9.1.0 and prior
What
Low-privileged attacker can compromise MySQL Server through multiple protocols due to a privilege-related vulnerability.
Who is affected
MySQL 9.1.0 and earlier deployments accessible via network with low-privilege user accounts.
Urgency
Medium severity (CVSS 4.3) with network accessibility; patch soon to prevent unauthorized escalation.
Action
Update MySQL Server to a version after 9.1.0 with the privilege vulnerability patched.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 4.3
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21567

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-2025-21567coverage & exploitation statusNVD · CVE.org

Recent advisories for MySQL Server product

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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