CVE-2016-2047

MEDIUMNVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

Score 5.9 from GitHub Security Advisory published 2022-05-13. NVD baseline CVSS 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 4%CVSS: 5.9Exploit: NoneExposed: 0

A fix is available — apply it.

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."

CVSS v3
5.9
EG Score
5.9(medium)
EG Risk
33(Track)
EG Risk 33/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity59% × 45%
Exploitation4% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
88.7%
KEV
Not listed

Published

January 27, 2016

Last Modified

May 6, 2026

References (48)

Vendor Advisories for CVE-2016-2047(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(7)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntumysql-testsuite-5.7 (5.7.12-0ubuntu1) @ xenial2026-05-22ubuntu
ubuntumysql-server-5.6 (5.6.30-0ubuntu0.15.10.1) @ wily2026-05-22ubuntu
redhatmariadb55-mariadb-0:5.5.49-1.el72016-07-25redhat
redhatmysql55-mysql-0:5.5.50-1.el72016-07-25redhat
redhatrh-mariadb100-mariadb-1:10.0.25-4.el72016-05-26redhat
redhatrh-mysql56-mysql-0:5.6.30-1.el72016-05-02redhat
redhatmariadb-1:5.5.47-1.el7_22016-03-31redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Additional Vendor Advisories

(6)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 12× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 102 total refreshes for this CVE.

  1. 2026-07-23 14:14 UTCEPSS rescore
  2. 2026-07-23 01:22 UTCEG score recompute
  3. 2026-07-22 22:01 UTCEG score recompute
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  20. 2026-07-12 11:38 UTCOSV refresh
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  19. 2026-06-23 17:20 UTCOSV refresh
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  44. 2026-06-06 23:29 UTCOSV refresh
  45. 2026-06-05 22:44 UTCEPSS rescore
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  64. 2026-05-22 21:36 UTCEG score recompute
  65. 2026-05-22 21:36 UTCVendor advisory
  66. 2026-05-22 21:35 UTCGHSA enrichment
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Frequently asked(5)

What is CVE-2016-2047?
CVE-2016-2047 is a medium vulnerability published on January 27, 2016. The sslverifyserver_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…
When was CVE-2016-2047 disclosed?
CVE-2016-2047 was first published in the National Vulnerability Database on January 27, 2016, with the most recent update on May 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-2047 actively exploited?
CVE-2016-2047 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 88.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2016-2047?
CVE-2016-2047 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2016-2047?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-2047, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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