CVE-2025-21493: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Security: Privileges). Supported versions that are affected are 8.4.3 and prior and 9.1.0 and prior. Difficult to exploit vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1

CSIRTS triage

What: A privilege-related vulnerability in MySQL Server security component allows a high-privileged attacker with network access to escalate privileges.
Who is affected: MySQL Server deployments running versions 8.4.3 and earlier or 9.1.0 and earlier.
Urgency: Medium severity; exploitation is difficult and requires high privileges, but patching should be prioritized for accessible instances.
Action: Upgrade MySQL Server to the latest patched version released by Oracle.

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EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2025-214930.82% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 55% of all EPSS-scored CVEs.

CVE	CSIRTS overview	External
CVE-2025-21493	coverage & exploitation status	NVD · CVE.org