CVE-2016-6663

HIGHNVD 7.07.0—
EchelonGraph scoreMEDIUM confidence

Score 7.0 from GitHub Security Advisory (severity: HIGH) published 2022-05-14. NVD baseline CVSS 7.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
7.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 4%CVSS: 7.0Exploit: Elevated riskExposed: 0

A fix is available — apply it.

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.

CVSS v3
7.0
EG Score
7.0(medium)
EG Risk
52(Track)
EG Risk 52/100SSVC: 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
Severity70% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
4%
EPSS %ILE
91%
KEV
Not listed

Published

December 13, 2016

Last Modified

June 17, 2026

References (48)

Patch Availability(7)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatmysql-0:5.1.73-8.el6_82017-01-24redhat
redhatrh-mariadb101-mariadb-1:10.1.19-6.el72016-12-08redhat
redhatrh-mariadb100-mariadb-1:10.0.28-5.el72016-12-08redhat
redhatrh-mysql56-mysql-0:5.6.34-2.el72016-11-15redhat
redhatmariadb-1:5.5.52-1.el72016-11-03redhat
redhatmariadb55-mariadb-0:5.5.53-1.el72016-10-31redhat
redhatmysql55-mysql-0:5.5.52-1.el72016-10-31redhat

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.

Affected Packages

(1 across 1 ecosystem)
Debian:8(1)
PackageVulnerable rangeFixed inDependents
mariadb-10.010.0.16-1 ... 10.0.27-2 (46 versions)10.0.28-0+deb8u1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(7)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 6× in last 7d / 21× 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 142 total refreshes for this CVE.

  1. 2026-09-19 15:35 UTCEPSS rescore
  2. 2026-09-18 19:22 UTCEPSS rescore
  3. 2026-09-18 18:06 UTCOSV refresh
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  16. 2026-08-30 21:34 UTCOSV refresh
  17. 2026-08-28 21:35 UTCEPSS rescore
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  1. 2026-08-16 02:10 UTCEPSS rescore
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  3. 2026-08-14 08:16 UTCOSV refresh
  4. 2026-08-12 13:46 UTCEPSS rescore
  5. 2026-08-11 13:36 UTCEPSS rescore
  6. 2026-08-09 13:42 UTCEPSS rescore
  7. 2026-08-08 16:32 UTCEPSS rescore
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  17. 2026-07-29 16:07 UTCOSV refresh
  18. 2026-07-28 15:31 UTCEPSS rescore
  19. 2026-07-25 14:13 UTCEPSS rescore
  20. 2026-07-24 14:13 UTCEPSS rescore
  21. 2026-07-23 14:15 UTCEPSS rescore
  22. 2026-07-23 01:23 UTCEG score recompute
  23. 2026-07-22 22:03 UTCEG score recompute
  24. 2026-07-22 14:04 UTCEPSS rescore
  25. 2026-07-21 15:21 UTCEPSS rescore
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  27. 2026-07-20 17:04 UTCEPSS rescore
  28. 2026-07-19 14:28 UTCEPSS rescore
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  43. 2026-07-12 05:39 UTCOSV refresh
  44. 2026-07-11 08:24 UTCEPSS rescore
  45. 2026-07-09 19:06 UTCEPSS rescore
  46. 2026-07-08 15:10 UTCEPSS rescore
  47. 2026-07-07 13:42 UTCEPSS rescore
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  50. 2026-07-06 02:20 UTCEPSS rescore
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  54. 2026-07-01 15:02 UTCEPSS rescore
  55. 2026-06-30 23:19 UTCEPSS rescore
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  63. 2026-06-23 21:30 UTCEPSS rescore
  64. 2026-06-23 11:58 UTCOSV refresh
  65. 2026-06-21 14:54 UTCEPSS rescore
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  67. 2026-06-21 01:57 UTCEPSS rescore
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  69. 2026-06-19 19:23 UTCEPSS rescore
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  71. 2026-06-18 17:50 UTCEPSS rescore
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  75. 2026-06-16 17:50 UTCEPSS rescore

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 GitHub PoC) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCfirebroo/CVE-2016-6663
    First seen Nov 2, 2016
    Open source ↗
  • Exploit-DBEDB-40678
    First seen Nov 1, 2016

    MySQL / MariaDB / PerconaDB 5.5.x/5.6.x/5.7.x - 'mysql' System User Privilege Escalation / Race Condition

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2016-6663?
CVE-2016-6663 is a high vulnerability published on December 13, 2016. 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…
When was CVE-2016-6663 disclosed?
CVE-2016-6663 was first published in the National Vulnerability Database on December 13, 2016, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-6663 actively exploited?
CVE-2016-6663 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4% probability of exploitation in the next 30 days, which ranks it in the top 9.3% of all scored CVEs.
What is the CVSS score of CVE-2016-6663?
CVE-2016-6663 has a CVSS v3 base score of 7.0 (NVD).
How do I remediate CVE-2016-6663?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-6663, 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.

Dependency Blast Radius

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