CVE-2025-21501

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

CSIRTS triage

vendor: Oracle product: MySQL Server Information disclosureaffected: 8.0.40 and prior, 8.4.3 and prior, 9.1.0 and prior

What: Optimizer component vulnerability allowing low-privileged attacker to access unauthorized information via network.
Who is affected: MySQL Server deployments with versions 8.0.40, 8.4.3, or 9.1.0 and prior accessible from network.
Urgency: Medium severity (CVSS 6.5); requires network access and low privileges but information disclosure impact warrants timely patching.
Action: Upgrade MySQL Server to a version after 8.0.40, 8.4.3, or 9.1.0 respectively.

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Moderate exploitation risk1.0% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 60% of all EPSS-scored CVEs.

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