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CVE-2025-21546: Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Security: Privileges). Supported versions that are affected are 8.0.40 and prior, 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 update, insert or delete access to some of MySQL Server accessible data as well

lowCVSS 3.8CVE-2025-21546

CSIRTS triage

vendor: Oracleproduct: MySQL ServerPrivilege escalationaffected: 8.0.40 and prior, 8.4.3 and prior, 9.1.0 and prior
What
A security privileges component vulnerability allows a high-privileged attacker to compromise MySQL Server.
Who is affected
All supported MySQL versions up to 8.0.40, 8.4.3, and 9.1.0 with high-privileged users with network access.
Urgency
Low priority with a CVSS of 3.8; not currently exploited and requires high privilege to trigger.
Action
Upgrade to a patched version after 8.0.40, 8.4.3, or 9.1.0.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
low — CVSS 3.8
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21546

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-2025-21546coverage & exploitation statusNVD · CVE.org

Recent advisories for MySQL Server product

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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