CVE-2016-3521

Unspecified vulnerability in Oracle MySQL 5.5.49 and earlier, 5.6.30 and earlier, and 5.7.12 and earlier and MariaDB before 5.5.50, 10.0.x before 10.0.26, and 10.1.x before 10.1.15 allows remote authenticated users to affect availability via vectors related to Server: Types.

Published: 2016-07-21 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-3521 is rated Moderate Risk (63/100): CVSS Medium severity, with high exploitation likelihood (EPSS 5.87%, 92th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +4.76% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2016-3521

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.12% 5.87% +4.76%
2 2026-05-29 0.83% 1.12% +0.28%
3 2026-04-29 — 0.83% —

Full EPSS history (24 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-3521

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.0 MEDIUM
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:L/Au:S/C:N/I:N/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.0 6.9 [email protected]

Weakness enumeration for CVE-2016-3521

OS Trackers for CVE-2016-3521

vendor priority summary link
redhat medium — https://access.redhat.com/security/cve/CVE-2016-3521
suse high CVE-2016-3521 severity important: SUSE including 180 source package names (4.0.0:libmysqlclient18-10.0.26-9.2, beta1:libmysqlclient18-10.0.26-9.2, …), 391 product×package rows across 60 product lines (Container caasp/v4/salt-master, Container caasp/v4/velum, … (60 product lines)): Fixed 362, Known Not Affected 29. https://www.suse.com/security/cve/CVE-2016-3521/
ubuntu medium CVE-2016-3521 medium priority: Ubuntu including 9 source packages (mariadb-10.0, mariadb-5.5, …), 211 status rows across 25 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, precise, questing, trusty, upstream, vivid, wily, xenial, yakkety, zesty): DNE 166, not-affected 19, released 13, ignored 6, needs-triage 6, needed 1. https://ubuntu.com/security/CVE-2016-3521

Affected software / configurations for CVE-2016-3521

Vendor Product Version Raw CPE
ibm powerkvm 2.1 cpe:2.3:a:ibm:powerkvm:2.1:*:*:*:*:*:*:*
ibm powerkvm 3.1 cpe:2.3:a:ibm:powerkvm:3.1:*:*:*:*:*:*:*
mariadb mariadb >= 5.5.20, < 5.5.50 cpe:2.3:a:mariadb:mariadb:*:*:*:*:*:*:*:*
mariadb mariadb >= 10.0.0, < 10.0.26 cpe:2.3:a:mariadb:mariadb:*:*:*:*:*:*:*:*
mariadb mariadb >= 10.1.0, < 10.1.15 cpe:2.3:a:mariadb:mariadb:*:*:*:*:*:*:*:*
oracle mysql >= 5.5.0, <= 5.5.49 cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:*
oracle mysql >= 5.6.0, <= 5.6.30 cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:*
oracle mysql >= 5.7.0, <= 5.7.12 cpe:2.3:a:oracle:mysql:*:*:*:*:*:*:*:*
oracle linux 7 cpe:2.3:o:oracle:linux:7:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
canonical ubuntu_linux 12.04 cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 14.04 cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 15.10 cpe:2.3:o:canonical:ubuntu_linux:15.10:*:*:*:*:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*

References for CVE-2016-3521

URL Tags
http://lists.opensuse.org/opensuse-updates/2016-09/msg00042.html Mailing List Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-1480.html Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-1601.html Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-1602.html Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-1603.html Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-1604.html Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-1637.html Third Party Advisory
http://www-01.ibm.com/support/docview.wss?uid=isg3T1024168 Third Party Advisory
http://www.debian.org/security/2016/dsa-3624 Third Party Advisory
http://www.debian.org/security/2016/dsa-3632 Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html Patch Vendor Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html Vendor Advisory
http://www.securityfocus.com/bid/91787 Third Party Advisory VDB Entry
http://www.securityfocus.com/bid/91932 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1036362 Third Party Advisory VDB Entry
http://www.ubuntu.com/usn/USN-3040-1 Third Party Advisory
https://mariadb.com/kb/en/mariadb/mariadb-10026-release-notes/ Vendor Advisory
https://mariadb.com/kb/en/mariadb/mariadb-10115-release-notes/ Vendor Advisory
https://mariadb.com/kb/en/mariadb/mariadb-5550-release-notes/ Vendor Advisory
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