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CVE-2025-21529: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Information Schema). 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 Ser

mediumCVSS 4.9CVE-2025-21529

CSIRTS triage

vendor: Oracleproduct: MySQL ServerInformation disclosureaffected: 8.0.40 and prior, 8.4.3 and prior, 9.1.0 and prior
What
A vulnerability in MySQL Server Information Schema component allows high-privileged attackers with network access to access sensitive information.
Who is affected
MySQL Server deployments 8.0.40, 8.4.3, or 9.1.0 and earlier with high-privileged network-accessible accounts.
Urgency
Medium severity (CVSS 4.9) and not exploited; requires high privilege level which limits practical risk.
Action
Upgrade MySQL Server to a patched version 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 4.9
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21529

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-2025-21529coverage & exploitation statusNVD · CVE.org

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