{"id":"GHSA-wr2v-9rpq-c35q","summary":"Etcd Gateway TLS authentication only applies to endpoints detected in DNS SRV records","details":"### Vulnerability type\nCryptography\n\n### Workarounds\nRefer to the [gateway documentation](https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/gateway.md). The vulnerability was spotted due to unclear documentation of how the gateway handles endpoints validation.\n\n### Detail\nWhen starting a gateway, TLS authentication will only be attempted on endpoints identified in DNS SRV records for a given domain, which occurs in the discoverEndpoints function. No authentication is performed against endpoints provided in the --endpoints flag. The auditors has noted that appropriate documentation of this validation functionality plus deprecation of this misleading functionality is an acceptable path forward.\n \n### References\nFind out more on this vulnerability in the [security audit report](https://github.com/etcd-io/etcd/blob/master/security/SECURITY_AUDIT.pdf)\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Contact the [etcd security committee](https://github.com/etcd-io/etcd/blob/master/security/security-release-process.md#product-security-committee-psc)","aliases":["CVE-2020-15136"],"modified":"2026-07-17T21:05:13.141439298Z","published":"2024-01-31T00:21:56Z","database_specific":{"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2024-01-31T00:21:56Z","nvd_published_at":"2020-08-06T23:15:00Z","cwe_ids":["CWE-287","CWE-306"]},"references":[{"type":"WEB","url":"https://github.com/etcd-io/etcd/security/advisories/GHSA-wr2v-9rpq-c35q"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-15136"},{"type":"WEB","url":"https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/gateway.md"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L6B6R43Y7M3DCHWK3L3UVGE2K6WWECMP"}],"affected":[{"package":{"name":"go.etcd.io/etcd","ecosystem":"Go","purl":"pkg:golang/go.etcd.io/etcd"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.4.0-rc.0"},{"fixed":"3.4.10"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 3.4.9","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/01/GHSA-wr2v-9rpq-c35q/GHSA-wr2v-9rpq-c35q.json"}},{"package":{"name":"go.etcd.io/etcd","ecosystem":"Go","purl":"pkg:golang/go.etcd.io/etcd"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.3.23"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/01/GHSA-wr2v-9rpq-c35q/GHSA-wr2v-9rpq-c35q.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N"}]}