CVE-2025-21504

mediumCVSS 4.9covered by 1 sourcefirst seen 2026-08-06

CSIRTS triage

vendor: Oracle product: MySQL ServerOtheraffected: 8.0.39 and prior, 8.4.2 and prior, 9.0.1 and prior

What: An optimizer vulnerability in MySQL Server that can be exploited by a high-privileged attacker with network access.
Who is affected: MySQL Server deployments running versions 8.0.39 or earlier, 8.4.2 or earlier, or 9.0.1 or earlier.
Urgency: Low-to-medium urgency; CVSS 4.9 (medium severity), not exploited in the wild, requires high privilege level to exploit.
Action: Upgrade MySQL Server to versions after 8.0.39, 8.4.2, or 9.0.1 as applicable.

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Moderate exploitation risk1.3% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 67% of all EPSS-scored CVEs.

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