CVE-2025-21500

mediumCVSS 6.5covered by 1 sourcefirst seen 2026-08-06

CSIRTS triage

vendor: Oracle product: MySQL ServerOtheraffected: 8.0.40 and prior, 8.4.3 and prior, 9.1.0 and prior

What: Vulnerability in the Optimizer component of MySQL Server allows a low-privileged attacker with network access to cause unspecified impact.
Who is affected: Oracle MySQL deployments on all affected versions with network-exposed instances.
Urgency: Medium severity (CVSS 6.5); easily exploitable by low-privileged network users.
Action: Update MySQL Server to a patched version addressing CVE-2025-21500.

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Moderate exploitation risk1.0% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 61% of all EPSS-scored CVEs.

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