CVE-2018-16886

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 4.0%, top 10% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 4%CVSS: 8.1Exploit: None knownExposed: 0

A fix is available — apply it.

etcd versions 3.2.x before 3.2.26 and 3.3.x before 3.3.11 are vulnerable to an improper authentication issue when role-based access control (RBAC) is used and client-cert-auth is enabled. If an etcd client server TLS certificate contains a Common Name (CN) which matches a valid RBAC username, a remote attacker may authenticate as that user with any valid (trusted) client certificate in a REST API request to the gRPC-gateway.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
43(Track)
EG Risk 43/100SSVC: 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
Severity81% × 45%
Exploitation4% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
4%
EPSS %ILE
90%
KEV
Not listed

Published

January 14, 2019

Last Modified

November 21, 2024

Advisory Details (8)

Auto-updated Sep 16, 2026
Patch available. Sources: redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 7 Extras.

https://access.redhat.com/errata/RHSA-2019:0237
generic

CVE-2018-16886 - PSIRT.COM

http://www.securityfocus.com/bid/106540
generic

[SECURITY] Fedora 30 Update: etcd-3.3.12-1.20190314gite1ca3b4.fc30 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UPGYHMSKDPW5GAMI7BEP3XQRVRLLBJKS/
generic

[SECURITY] Fedora 29 Update: etcd-3.3.12-4.20190413gitf29b1ad.fc29 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JX7QTIT465BQGRGNCE74RATRQLKT2QE4/
generic

etcd/CHANGELOG-3.3.md at 1eee465a43720d713bb69f7b7f5e120135fdb1ac · etcd-io/etcd · GitHub

https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.3.md#security-authentication
generic

etcd/CHANGELOG-3.2.md at 1eee465a43720d713bb69f7b7f5e120135fdb1ac · etcd-io/etcd · GitHub

https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.2.md#security-authentication
redhat Patch Available

1651034 – (CVE-2018-16886) CVE-2018-16886 etcd: Improper Authentication in auth/store.go:AuthInfoFromTLS() via gRPC-gateway

Affected: Red Hat Enterprise Linux 7 Extras

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16886
redhat Patch Available

Affected: Red Hat Enterprise Linux 7 Extras.

https://access.redhat.com/errata/RHSA-2019:1352

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatetcd-0:3.2.26-1.el72019-06-04redhat

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

(6 across 5 ecosystems)
Go(2)
PackageVulnerable rangeFixed inDependents
go.etcd.io/etcd—0.5.0-alpha.5.0.20190108173120-83c051b701d3—
go.etcd.io/etcd/v3—3.3.11—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
etcd—3.2.26+dfsg-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
etcd—3.2.26+dfsg-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
etcd—3.2.26+dfsg-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
etcd—3.2.26+dfsg-1—

Weakness Classification(1)

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

All Vendor Advisories

(1)

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 / 28× 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 144 total refreshes for this CVE.

  1. 2026-09-19 15:36 UTCEPSS rescore
  2. 2026-09-18 19:22 UTCEPSS rescore
  3. 2026-09-17 19:22 UTCEPSS rescore
  4. 2026-09-16 14:03 UTCEPSS rescore
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  6. 2026-09-15 03:05 UTCEPSS rescore
  7. 2026-09-12 14:56 UTCEPSS rescore
  8. 2026-09-11 14:47 UTCEPSS rescore
  9. 2026-09-10 09:27 UTCEPSS rescore
  10. 2026-09-08 19:04 UTCOSV refresh
  11. 2026-09-07 15:57 UTCEPSS rescore
  12. 2026-09-06 13:43 UTCEPSS rescore
  13. 2026-09-05 15:24 UTCEPSS rescore
  14. 2026-09-04 13:56 UTCEPSS rescore
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  20. 2026-08-30 19:13 UTCEPSS rescore
  21. 2026-08-28 21:36 UTCEPSS rescore
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  24. 2026-08-25 13:44 UTCEPSS rescore
  25. 2026-08-23 00:14 UTCEPSS rescore
Show 75 more
  1. 2026-08-22 04:07 UTCOSV refresh
  2. 2026-08-21 23:44 UTCEPSS rescore
  3. 2026-08-20 22:51 UTCEPSS rescore
  4. 2026-08-19 17:00 UTCEPSS rescore
  5. 2026-08-18 13:43 UTCEPSS rescore
  6. 2026-08-17 13:42 UTCEPSS rescore
  7. 2026-08-16 14:51 UTCEPSS rescore
  8. 2026-08-16 02:10 UTCEPSS rescore
  9. 2026-08-15 01:26 UTCEPSS rescore
  10. 2026-08-13 21:56 UTCEPSS rescore
  11. 2026-08-12 13:46 UTCEPSS rescore
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  14. 2026-08-08 16:32 UTCEPSS rescore
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  16. 2026-08-06 13:42 UTCEPSS rescore
  17. 2026-08-06 13:42 UTCEPSS rescore
  18. 2026-08-06 07:24 UTCOSV refresh
  19. 2026-08-04 15:05 UTCEPSS rescore
  20. 2026-08-02 02:23 UTCEPSS rescore
  21. 2026-08-01 04:12 UTCEPSS rescore
  22. 2026-07-30 16:24 UTCEPSS rescore
  23. 2026-07-30 01:27 UTCEPSS rescore
  24. 2026-07-28 15:32 UTCEPSS rescore
  25. 2026-07-24 14:14 UTCEPSS rescore
  26. 2026-07-23 14:15 UTCEPSS rescore
  27. 2026-07-23 14:15 UTCEPSS rescore
  28. 2026-07-23 01:34 UTCEG score recompute
  29. 2026-07-22 22:14 UTCEG score recompute
  30. 2026-07-22 14:04 UTCEPSS rescore
  31. 2026-07-21 15:21 UTCEPSS rescore
  32. 2026-07-21 00:17 UTCOSV refresh
  33. 2026-07-20 17:04 UTCEPSS rescore
  34. 2026-07-20 17:04 UTCEPSS rescore
  35. 2026-07-19 14:28 UTCEPSS rescore
  36. 2026-07-19 02:26 UTCEPSS rescore
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  38. 2026-07-16 16:59 UTCEPSS rescore
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  40. 2026-07-15 16:55 UTCEPSS rescore
  41. 2026-07-15 01:56 UTCEPSS rescore
  42. 2026-07-13 22:26 UTCEPSS rescore
  43. 2026-07-12 05:43 UTCEPSS rescore
  44. 2026-07-11 08:24 UTCEPSS rescore
  45. 2026-07-09 19:06 UTCEPSS rescore
  46. 2026-07-08 15:11 UTCEPSS rescore
  47. 2026-07-07 13:42 UTCEPSS rescore
  48. 2026-07-07 13:42 UTCEPSS rescore
  49. 2026-07-06 16:24 UTCEPSS rescore
  50. 2026-07-06 16:24 UTCEPSS rescore
  51. 2026-07-06 02:20 UTCEPSS rescore
  52. 2026-07-05 02:27 UTCEPSS rescore
  53. 2026-07-04 06:28 UTCEPSS rescore
  54. 2026-07-03 19:26 UTCOSV refresh
  55. 2026-07-02 16:54 UTCEPSS rescore
  56. 2026-07-01 15:03 UTCEPSS rescore
  57. 2026-07-01 15:03 UTCEPSS rescore
  58. 2026-06-30 23:19 UTCEPSS rescore
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  60. 2026-06-28 14:04 UTCEPSS rescore
  61. 2026-06-28 04:53 UTCEPSS rescore
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  63. 2026-06-27 03:06 UTCEPSS rescore
  64. 2026-06-25 13:47 UTCEPSS rescore
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  66. 2026-06-24 14:02 UTCEPSS rescore
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  68. 2026-06-23 21:30 UTCEPSS rescore
  69. 2026-06-21 14:54 UTCEPSS rescore
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  71. 2026-06-21 01:57 UTCEPSS rescore
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  73. 2026-06-19 19:23 UTCEPSS rescore
  74. 2026-06-18 17:50 UTCEPSS rescore
  75. 2026-06-18 17:50 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2018-16886?
CVE-2018-16886 is a high vulnerability published on January 14, 2019. etcd versions 3.2.x before 3.2.26 and 3.3.x before 3.3.11 are vulnerable to an improper authentication issue when role-based access control (RBAC) is used and client-cert-auth is enabled. If an etcd client server TLS certificate contains a Common Name (CN) which matches a valid RBAC username, a…
When was CVE-2018-16886 disclosed?
CVE-2018-16886 was first published in the National Vulnerability Database on January 14, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-16886 actively exploited?
CVE-2018-16886 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 9.9% of all scored CVEs.
What is the CVSS score of CVE-2018-16886?
CVE-2018-16886 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2018-16886?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-16886, 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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