CVE-2025-21555

mediumCVSS 5.5covered 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: An easily exploitable vulnerability in the InnoDB component allows a high-privileged attacker with network access to cause unspecified impact via multiple protocols.
Who is affected: MySQL Server deployments on versions 8.0.40, 8.4.3, and 9.1.0 or earlier.
Urgency: Medium severity (CVSS 5.5) and not currently exploited; remediation needed for affected versions.
Action: Update MySQL Server to versions 8.0.41, 8.4.4, 9.1.1 or later as appropriate for your deployment.

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Low exploitation risk0.73% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 51% of all EPSS-scored CVEs.

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