Is CVE-2016-6663 in the CISA KEV catalog?

No. CVE-2016-6663 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-6663?

CVE-2016-6663 has a CVSS v3 base score of 7.0 (HIGH).

What is the EPSS score for CVE-2016-6663?

CVE-2016-6663 has an EPSS score of 4.31% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-6663?

Upgrade MariaDB to 5.5.52 or later.

CVE & CISA-KEV Catalog

CVE-2016-6663

HIGHEPSS 90th pctl

7.0

CVSS v3

NVD

Description

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.

CWE-362Race Condition

How to fix

Remediation Available

MariaDBWindows application

Affected:5.5.20 5.5.52Fixed in:5.5.52MariaDB Corporation Ab

Affected:10.0.0 10.0.28Fixed in:10.0.28MariaDB Corporation Ab

Affected:10.1.0 10.1.18Fixed in:10.1.18MariaDB Corporation Ab

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

4.31%probability of exploitation in 30 days

90thpercentile

High risk: more likely to be exploited than 90% of all known CVEs.

References

Patch3

Exploit2

Vendor Advisory8

Third-Party Advisory11

Related Vulnerabilities

Other CWE-362 (Race Condition) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-6387	High	8.1	100%	-	Fix
CVE-2023-36884	High	7.5	99%	KEV + Ransom	Fix
CVE-2018-15473	Medium	5.3	99%	-	Fix
CVE-2024-27983	High	8.2	87%	-	Fix
CVE-2014-0226	Medium	6.8	86%	-	Fix
CVE-2016-5195	High	7.0	84%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.