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CVE-2016-6664

35
FAUCET Score

CVE-2016-6664 is a local privilege escalation vulnerability affecting MySQL, MariaDB, and Percona Server versions through a symlink attack on error logs. A local user with access to the 'mysql' account can exploit this flaw to gain root privileges. This vulnerability is rated as High severity (CVSS 7.0) due to its low attack complexity and high impact on confidentiality, integrity, and availability. While not listed on CISA KEV, public exploit code exists on ExploitDB, and it has garnered significant community discussion and media coverage, indicating a high potential for exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
>= 5.5.0, <= 5.5.51CPE matchmatch criteria
cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:*
>= 5.6.0, <= 5.6.32CPE matchmatch criteria
cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:*
>= 5.7.0, <= 5.7.14CPE matchmatch criteria
cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:*
>= 5.5.0, < 5.5.54CPE matchmatch criteria
cpe:2.3:a:mariadb:mariadb:*:*:*:*:*:*:*:*
>= 10.0.0, < 10.0.29CPE matchmatch criteria
cpe:2.3:a:mariadb:mariadb:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.0HIGH

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.0
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.08%
Probability of exploitation in next 30 days
EPSS Percentile
86.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
ExploitDB: EDB-40679 · Nov 1, 2016
This CVE's current EPSS score of 0.0308 is in the 97th percentile among its peer group of 1,516 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.4 InfoSec Media, 0.1 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (45)

microsoftpatch availablevia msrc
Product: cm1 mariadb 10.3.28-1 on CBL Mariner 1.0Fixed in: 10.3.28-1
microsoftpatch availablevia msrc
Product: 16875-16820Fixed in: 10.3.28-1
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 ARMFixed in: 10.3.28-1
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 x64Fixed in: 10.3.28-1
oraclepatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 6Fixed in: rh-mariadb101-galera-0:25.3.12-12.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 6Fixed in: rh-mariadb101-mariadb-1:10.1.29-3.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.6 EUSFixed in: mysql55-mysql-0:5.5.52-1.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUSFixed in: rh-mysql56-mysql-0:5.6.34-2.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUSFixed in: rh-mariadb100-mariadb-1:10.0.33-3.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUSFixed in: rh-mariadb101-galera-0:25.3.12-12.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUSFixed in: rh-mariadb101-mariadb-1:10.1.29-3.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: mysql55-mysql-0:5.5.52-1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: rh-mysql56-mysql-0:5.6.34-2.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: rh-mariadb100-mariadb-1:10.0.33-3.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: rh-mariadb101-galera-0:25.3.12-12.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7Fixed in: rh-mariadb101-mariadb-1:10.1.29-3.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.1 EUSFixed in: mysql55-mysql-0:5.5.52-1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.1 EUSFixed in: rh-mysql56-mysql-0:5.6.34-2.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUSFixed in: mysql55-mysql-0:5.5.52-1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUSFixed in: rh-mysql56-mysql-0:5.6.34-2.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUSFixed in: rh-mariadb100-mariadb-1:10.0.33-3.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUSFixed in: rh-mariadb101-galera-0:25.3.12-12.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUSFixed in: rh-mariadb101-mariadb-1:10.1.29-3.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUSFixed in: rh-mariadb100-mariadb-1:10.0.33-3.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUSFixed in: rh-mariadb101-galera-0:25.3.12-12.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUSFixed in: rh-mariadb101-mariadb-1:10.1.29-3.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUSFixed in: mysql55-mysql-0:5.5.52-1.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: mariadb-1:5.5.56-2.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 6Fixed in: mysql55-mysql-0:5.5.52-1.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 6Fixed in: rh-mysql56-mysql-0:5.6.34-2.el6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Software Collections for Red Hat Enterprise Linux 6Fixed in: rh-mariadb100-mariadb-1:10.0.33-3.el6
View patch
redhatno patchvia redhat_api
Product: Red Hat Software CollectionsFixed in: rh-mariadb101-mariadb
redhatno patchvia redhat_api
Product: Red Hat Software CollectionsFixed in: mariadb55-mariadb
redhatno patchvia redhat_api
Product: Red Hat Software CollectionsFixed in: rh-mariadb100-mariadb
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 10 (Newton)Fixed in: mariadb-galera
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 11 (Ocata)Fixed in: mariadb-galera
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 12 (Pike)Fixed in: mariadb-galera
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 8 (Liberty)Fixed in: mariadb-galera
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 9 (Mitaka)Fixed in: mariadb-galera
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: mysql
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux OpenStack Platform 5 (Icehouse)Fixed in: mariadb-galera
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: mysql55-mysql
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux OpenStack Platform 6 (Juno)Fixed in: mariadb-galera
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux OpenStack Platform 7 (Kilo)Fixed in: mariadb-galera

Vendor Advisories (3)

microsoft2020-Sep/CVE-2016-6664

CVE-2016-6664

Sep 8, 2020
microsoft2016-Dec/CVE-2016-6664Important

mysqld_safe in Oracle MySQL through 5.5.51 5.6.x through 5.6.32 and 5.7.x through 5.7.14; MariaDB; 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 when using file-based logging allows local users with access to the mysql account to gain root privileges via a symlink attack on error logs and possibly other files.

Dec 13, 2016
redhatCVE-2016-6664Moderate

mysql: insecure error log file handling in mysqld_safe (CPU Oct 2016)

Oct 19, 2016

References

legalhackers.com / advisories/MySQL-Maria-Percona-RootPrivEsc-CVE-2016-6664-5617-Exploit.html
ExploitThird Party Advisory
packetstormsecurity.com / files/139491/MySQL-MariaDB-PerconaDB-Root-Privilege-Escalation.html
ExploitThird Party AdvisoryVDB Entry
rhn.redhat.com / errata/RHSA-2016-2130.html
Third Party Advisory
rhn.redhat.com / errata/RHSA-2016-2749.html
Third Party Advisory
access.redhat.com / errata/RHSA-2017:2192
Third Party Advisory
access.redhat.com / errata/RHSA-2018:0279
Third Party Advisory
access.redhat.com / errata/RHSA-2018:0574
Third Party Advisory
seclists.org / fulldisclosure/2016/Nov/4
Mailing ListThird Party Advisory
security.gentoo.org / glsa/201702-18
Third Party Advisory
exploit-db.com / exploits/40679
ExploitThird Party AdvisoryVDB Entry
percona.com / blog/2016/11/02/percona-responds-to-cve-2016-6663-and-cve-2016-6664
Vendor Advisory
debian.org / security/2017/dsa-3770
Third Party Advisory
oracle.com / technetwork/security-advisory/cpuoct2016-2881722.html
PatchVendor Advisory
securityfocus.com / archive/1/539695/100/0/threaded
Third Party AdvisoryVDB Entry
securityfocus.com / bid/93612
Third Party AdvisoryVDB Entry