{"cve":"CVE-2018-16886","nvd":{"published":"2019-01-14T19:29:00.243","modified":"2026-06-17T01:44:59.793","status":"Modified","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.1},"cwes":["CWE-287"],"references":["http://www.securityfocus.com/bid/106540","https://access.redhat.com/errata/RHSA-2019:0237","https://access.redhat.com/errata/RHSA-2019:1352","https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16886","https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.2.md#security-authentication"],"products":["etcd:etcd","fedoraproject:fedora","redhat:enterprise_linux_desktop","redhat:enterprise_linux_server","redhat:enterprise_linux_workstation"],"source":"nvd","synced_at":"2026-10-19T20:54:36.112582389+00:00"},"epss":{"cve":"CVE-2018-16886","score":0.04064,"percentile":0.90666,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-h6xx-pmxh-3wgp","url":"https://osv.dev/vulnerability/GHSA-h6xx-pmxh-3wgp","summary":"go.etcd.io/etcd Authentication Bypass","modified":"2026-09-10T03:49:28.808778898Z","packages":[{"ecosystem":"Go","name":"go.etcd.io/etcd/v3","purl":"pkg:golang/go.etcd.io/etcd/v3","ranges":[">=3.2.0 <3.2.26"],"fixed":["3.2.26"]},{"ecosystem":"Go","name":"go.etcd.io/etcd/v3","purl":"pkg:golang/go.etcd.io/etcd/v3","ranges":[">=3.3.0 <3.3.11"],"fixed":["3.3.11"]},{"ecosystem":"Go","name":"go.etcd.io/etcd","purl":"pkg:golang/go.etcd.io/etcd","ranges":["<0.5.0-alpha.5.0.20190108173120-83c051b701d3"],"fixed":["0.5.0-alpha.5.0.20190108173120-83c051b701d3"]}]},{"id":"GO-2021-0077","url":"https://osv.dev/vulnerability/GO-2021-0077","summary":"Authentication bypass in go.etcd.io/etcd","modified":"2026-02-04T04:06:45.603231Z","packages":[{"ecosystem":"Go","name":"go.etcd.io/etcd","purl":"pkg:golang/go.etcd.io/etcd","ranges":["<0.5.0-alpha.5.0.20190108173120-83c051b701d3"],"fixed":["0.5.0-alpha.5.0.20190108173120-83c051b701d3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}