CVE-2016-6663

What it is

Race condition in Oracle MySQL before 5.5.52, 5.6.x before 5.6.33, 5.7.x before 5.7.15, and 8.x before 8.0.1; MariaDB before 5.5.52, 10.0.x before 10.0.28, and 10.1.x before 10.1.18; Percona Server before 5.5.51-38.2, 5.6.x before 5.6.32-78-1, and 5.7.x before 5.7.14-8; and Percona XtraDB Cluster before 5.5.41-37.0, 5.6.x before 5.6.32-25.17, and 5.7.x before 5.7.14-26.17 allows local users with certain permissions to gain privileges by leveraging use of my_copystat by REPAIR TABLE to repair a MyISAM table.

At a glance

Exploitability

Can be exploited locally on the machine with a low-privilege account. High risk of data exposure, data tampering, service disruption.

Exploit odds

4.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2016-12-13 21:59 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:51 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 4.3% in the next 30 days (EPSS).
• Severity: 7.0 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2016-12-13 21:59 UTC

Last modified

2026-06-17 00:51 UTC

Exploit probability

4.3% · EPSS, next 30 days

Weakness

CWE-362 · Race condition

Record status

Modified

Affected

• Oracle MySQL ≤ 5.5.52
• Oracle MySQL ≤ 5.6.33
• Oracle MySQL ≤ 5.7.15
• Percona Server < 5.5.51-38.2
• Percona Server < 5.6.32-78.1
• Percona Server < 5.7.14-8
• Percona Xtradb Cluster < 5.5.41-37.0
• Percona Xtradb Cluster < 5.6.32-25.17

Attack profile CVSS 3.0 · 7.0

Attack vector

Local

Complexity

High

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Is it in your code?

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