CVE-2018-16886: Etcd

High severity, CVSS 8.1. EPSS: 4% chance of exploitation in the next 30 days.

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.

Affected products

• Etcd Etcd: from 3.2.0, before 3.2.26 (fixed in 3.2.26); from 3.3.0, before 3.3.11 (fixed in 3.3.11)
• Fedoraproject Fedora: version 30 only
• Red Hat Enterprise Linux Desktop: version 7.0 only
• Red Hat Enterprise Linux Server: version 7.0 only
• Red Hat Enterprise Linux Workstation: version 7.0 only

Published 2019-01-14. Last modified 2026-06-17.