CVE-2025-21503

mediumCVSS 4.9covered 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: An easily exploitable vulnerability in the InnoDB component allows a high-privileged attacker to cause DoS via network access.
Who is affected: MySQL Server deployments on versions 8.0.40, 8.4.3, and 9.1.0 or earlier.
Urgency: Medium priority; easily exploitable but requires existing high privileges.
Action: Upgrade MySQL Server to a version after 8.0.40, 8.4.3, or 9.1.0 respectively.

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

⚡ Watch CVE-2025-21503

Get an email if CVE-2025-21503 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.

Moderate exploitation risk1.1% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 62% of all EPSS-scored CVEs.

— this badge updates automatically when the KEV or exploit status changes. How to embed it →

[![CVE-2025-21503 status](https://www.csirts.com/badge/CVE-2025-21503)](https://www.csirts.com/cve/CVE-2025-21503)