CVE-2018-16886

high

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.

References

Advisories
More

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

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

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

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

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

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

https://github.com/advisories/GHSA-h6xx-pmxh-3wgp

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

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

https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-1756

Details

Source: Mitre, NVD

Published: 2019-01-14

Updated: 2026-06-17

Named Vulnerability: GO-2021-0077Named Vulnerability: GHSA-h6xx-pmxh-3wgp

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

Severity: Medium

CVSS v3

Base Score: 8.1

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

Severity: High

EPSS

EPSS: 0.04031