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CVE-2016-6663

CWE-362Published: December 13, 2016· Updated: Jun 17, 2026

7.0

CVSS v3.1

Official 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.

Technical Analysis

CVE-2016-6663 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.0.

A proof-of-concept (PoC) exploit exists for CVE-2016-6663. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges Req.Low

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

Affected Vendors & Products

mariadb1 product(s)

mariadb

Oracle1 product(s)

mysql

percona2 product(s)

percona serverxtradb cluster

Source: NVD CPE · 5 total CPE entries

Exploit & PoC Resources

POC AVAILABLEProof-of-concept code exists

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttp://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html

PATCHhttps://github.com/MariaDB/server/commit/347eeefbfc658c8531878218487d729f4e020805

PATCHhttps://github.com/mysql/mysql-server/commit/4e5473862e6852b0f3802b0cd0c6fa10b5253291

PATCHhttp://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html

PATCHhttps://github.com/MariaDB/server/commit/347eeefbfc658c8531878218487d729f4e020805

PATCHhttps://github.com/mysql/mysql-server/commit/4e5473862e6852b0f3802b0cd0c6fa10b5253291

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-2130.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-2131.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-2595.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-2749.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-2927.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-2928.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2017-0184.html

ADVISORYhttp://seclists.org/fulldisclosure/2016/Nov/4

ADVISORYhttp://www.openwall.com/lists/oss-security/2016/10/25/4

ADVISORYhttp://www.securityfocus.com/bid/92911

ADVISORYhttp://www.securityfocus.com/bid/93614

ADVISORYhttps://dev.mysql.com/doc/relnotes/mysql/5.5/en/news-5-5-52.html

ADVISORYhttps://dev.mysql.com/doc/relnotes/mysql/5.6/en/news-5-6-33.html

ADVISORYhttps://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-15.html

ADVISORYhttps://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-1.html

ADVISORYhttps://legalhackers.com/advisories/MySQL-Maria-Percona-PrivEscRace-CVE-2016-6663-5616-Exploit.html

ADVISORYhttps://mariadb.com/kb/en/mariadb/mariadb-10028-release-notes/

ADVISORYhttps://mariadb.com/kb/en/mariadb/mariadb-10118-release-notes/

ADVISORYhttps://mariadb.com/kb/en/mariadb/mariadb-5552-release-notes/

ADVISORYhttps://www.exploit-db.com/exploits/40678/

ADVISORYhttps://www.percona.com/blog/2016/11/02/percona-responds-to-cve-2016-6663-and-cve-2016-6664/

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-2130.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-2131.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-2595.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-2749.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-2927.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2016-2928.html

ADVISORYhttp://rhn.redhat.com/errata/RHSA-2017-0184.html

ADVISORYhttp://seclists.org/fulldisclosure/2016/Nov/4

ADVISORYhttp://www.openwall.com/lists/oss-security/2016/10/25/4

ADVISORYhttp://www.securityfocus.com/bid/92911

ADVISORYhttp://www.securityfocus.com/bid/93614

ADVISORYhttps://dev.mysql.com/doc/relnotes/mysql/5.5/en/news-5-5-52.html

ADVISORYhttps://dev.mysql.com/doc/relnotes/mysql/5.6/en/news-5-6-33.html

ADVISORYhttps://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-15.html

ADVISORYhttps://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-1.html

ADVISORYhttps://legalhackers.com/advisories/MySQL-Maria-Percona-PrivEscRace-CVE-2016-6663-5616-Exploit.html

ADVISORYhttps://mariadb.com/kb/en/mariadb/mariadb-10028-release-notes/

ADVISORYhttps://mariadb.com/kb/en/mariadb/mariadb-10118-release-notes/

ADVISORYhttps://mariadb.com/kb/en/mariadb/mariadb-5552-release-notes/

ADVISORYhttps://www.exploit-db.com/exploits/40678/

ADVISORYhttps://www.percona.com/blog/2016/11/02/percona-responds-to-cve-2016-6663-and-cve-2016-6664/

All References (48)

→

http://rhn.redhat.com/errata/RHSA-2016-2130.htmlThird Party Advisory

→

http://rhn.redhat.com/errata/RHSA-2016-2131.htmlThird Party Advisory

→

http://rhn.redhat.com/errata/RHSA-2016-2595.htmlThird Party Advisory

→

http://rhn.redhat.com/errata/RHSA-2016-2749.htmlThird Party Advisory

→

http://rhn.redhat.com/errata/RHSA-2016-2927.htmlThird Party Advisory

→

http://rhn.redhat.com/errata/RHSA-2016-2928.htmlThird Party Advisory

→

http://rhn.redhat.com/errata/RHSA-2017-0184.htmlThird Party Advisory

→

http://seclists.org/fulldisclosure/2016/Nov/4Mailing List · Third Party Advisory

→

http://www.openwall.com/lists/oss-security/2016/10/25/4Mailing List · Third Party Advisory

→

http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.htmlPatch · Vendor Advisory

→

http://www.securityfocus.com/bid/92911Third Party Advisory · VDB Entry

→

http://www.securityfocus.com/bid/93614Third Party Advisory · VDB Entry

→

https://dev.mysql.com/doc/relnotes/mysql/5.5/en/news-5-5-52.htmlIssue Tracking · Vendor Advisory

→

https://dev.mysql.com/doc/relnotes/mysql/5.6/en/news-5-6-33.htmlIssue Tracking · Vendor Advisory

→

https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-15.htmlIssue Tracking · Vendor Advisory

Quick Facts

CVE IDCVE-2016-6663

CVSS Score7.0 / 10

SeverityHIGH

WeaknessCWE-362

CISA KEVNo

ExploitPOC

Affected3 vendor(s)

PublishedDec 13, 2016

Related CVEs (CWE-362)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2016-6663 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.

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