CVE-2025-21540

mediumCVSS 5.4covered by 1 sourcefirst seen 2026-08-06

CSIRTS triage

vendor: Oracle product: MySQL Server Privilege escalationaffected: 8.0.40 and prior, 8.4.3 and prior, 9.1.0 and prior

What: A privilege escalation vulnerability in the Security: Privileges component allows a low-privileged attacker to elevate privileges via network access.
Who is affected: MySQL Server deployments running 8.0.40 or earlier, 8.4.3 or earlier, or 9.1.0 or earlier, exposed to network access.
Urgency: Medium priority; CVSS 5.4 and easily exploitable by low-privileged attackers, but not currently exploited.
Action: Upgrade MySQL Server to a patched version beyond 8.0.40, 8.4.3, or 9.1.0 as provided by Oracle.

AI-assisted analysis generated from the source advisory — verify against the original.

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Low exploitation risk0.50% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all EPSS-scored CVEs.

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