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Vulnerability record · CVE-2018-16886 · published 14 January 2019

CVE-2018-16886: Etcd improper authentication vulnerability

Etcd · Etcd

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.

8.1 CVSS 3.1 High EPSS 4.0% · top 9.7% CWE-287 · Improper authentication
8.1CVSS 3.1 base score, v2 6.8
4.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
16References
17 Jun 2026Last modified by NVD

Description

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

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/106540 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:0237 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1352 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16886 Issue TrackingPatchThird Party Advisory
https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.2.md#security-authentication Release Notes
https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.3.md#security-authentication Release Notes
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JX7QTIT465BQGRGNCE74RAT
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UPGYHMSKDPW5GAMI7BEP3XQ
http://www.securityfocus.com/bid/106540 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:0237 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1352 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16886 Issue TrackingPatchThird Party Advisory
https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.2.md#security-authentication Release Notes
https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.3.md#security-authentication Release Notes
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JX7QTIT465BQGRGNCE74RAT
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UPGYHMSKDPW5GAMI7BEP3XQ

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Source: NIST National Vulnerability Database (record CVE-2018-16886), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.