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CVE-2025-21499: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: DDL). Supported versions that are affected are 8.4.3 and prior and 9.1.0 and prior. Easily exploitable 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 Base Score 4.9 (Ava

mediumCVSS 4.9CVE-2025-21499

CSIRTS triage

vendor: Oracleproduct: MySQL ServerPrivilege escalationaffected: 8.4.3 and prior, 9.1.0 and prior
What
A high-privilege attacker with network access can compromise the server via the DDL component.
Who is affected
MySQL Server deployments running versions 8.4.3 or earlier, or 9.1.0 or earlier.
Urgency
Medium severity (CVSS 4.9); not currently exploited in the wild, but requires high privilege to trigger.
Action
Upgrade to MySQL Server version 8.4.4 or 9.1.1 or later.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 4.9
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21499

Exploitation outlook

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

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-21499coverage & exploitation statusNVD · CVE.org

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