CVE-2016-2047

MEDIUMEPSS 89th pctl

5.9

CVSS v3

Description

The ssl_verify_server_cert function in sql-common/client.c in MariaDB before 5.5.47, 10.0.x before 10.0.23, and 10.1.x before 10.1.10; Oracle MySQL 5.5.48 and earlier, 5.6.29 and earlier, and 5.7.11 and earlier; and Percona Server do not properly verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via a "/CN=" string in a field in a certificate, as demonstrated by "/OU=/CN=bar.com/CN=foo.com."

CWE-254

How to fix

Remediation Available

mysql-5.5Ubuntu

Fixed in:5.5.49-0ubuntu0.14.04.1USN-2953-1

mysql-5.7Ubuntu

Fixed in:5.7.12-0ubuntu1USN-2954-1

mysql-server-5.5Ubuntu

Fixed in:5.5.49-0ubuntu0.14.04.1USN-2953-1

mysql-server-5.7Ubuntu

Fixed in:5.7.12-0ubuntu1USN-2954-1

MariaDBWindows application

Affected:10.1.0 10.1.10Fixed in:10.1.10MariaDB Corporation Ab

Affected:10.0.0 10.0.23Fixed in:10.0.23MariaDB Corporation Ab

Affected:5.5.20 5.5.47Fixed in:5.5.47MariaDB Corporation Ab

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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 VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

3.74%probability of exploitation in 30 days

89thpercentile

Elevated risk: more likely to be exploited than 89% of all known CVEs.

References

Related Vulnerabilities

Other CWE-254 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2016-0161	Medium	6.5	69%	-	-
CVE-2016-2296	Critical	9.4	64%	-	-
CVE-2015-1793	Medium	6.5	62%	-	Fix
CVE-2016-2118	High	7.5	37%	-	Fix
CVE-2016-3238	High	8.1	35%	-	-
CVE-2016-3198	Medium	6.5	32%	-	-

Common questions

How do I fix CVE-2016-2047?

Published advisories record a fix for 5 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2016-2047 being actively exploited?

Not that we know of. CVE-2016-2047 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 3.7% is the estimated probability that it will be exploited in the next 30 days. That is higher than 89% of all scored CVEs.

How severe is CVE-2016-2047?

CVE-2016-2047 has a CVSS v3 base score of 5.9, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2016-2047 affect?

Published advisories record a fix for mysql-5.5 (Ubuntu), mysql-5.7 (Ubuntu), mysql-server-5.5 (Ubuntu), mysql-server-5.7 (Ubuntu), and 1 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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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.