{"id":"CVE-2018-21029","aliases":["DEBIAN-CVE-2018-21029","EUVD-2018-13551","GHSA-h2fw-qh29-9jv7","openSUSE-SU-2024:11420-1"],"status":"disputed","title":"systemd 239 through 243 accepts any certificate signed by a trusted certificate authority for DNS...","description":"systemd 239 through 245 accepts any certificate signed by a trusted certificate authority for DNS Over TLS. Server Name Indication (SNI) is not sent, and there is no hostname validation with the GnuTLS backend. NOTE: This has been disputed by the developer as not a vulnerability since hostname validation does not have anything to do with this issue (i.e. there is no hostname to be sent)","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.03138,"percentile":0.87977,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-295"],"published":"2019-10-30T21:46:51Z","modified":"2026-10-24T10:49:39Z","fixes":[{"ecosystem":"Debian:12","package":"systemd","fixed_in":["244-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"systemd","fixed_in":["244-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"systemd","fixed_in":["244-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"systemd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"244-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"systemd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"244-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"systemd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"244-1"}]}]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"systemd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"249.4-2.2"}]}],"bundled":19}],"products":[{"vendor":"fedoraproject","product":"fedora"},{"vendor":"systemd_project","product":"systemd"}],"references":[{"url":"https://github.com/systemd/systemd/issues/9397","tags":["x_refsource_MISC","x_transferred","Issue 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Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-21029"},{"url":"https://blog.cloudflare.com/dns-encryption-explained"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4NLJVOJMB6ANDILRLDZK26YGLYBEPHKY"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4NLJVOJMB6ANDILRLDZK26YGLYBEPHKY"},{"url":"https://security.netapp.com/advisory/ntap-20191122-0002"},{"url":"https://github.com/advisories/GHSA-h2fw-qh29-9jv7"},{"url":"https://security-tracker.debian.org/tracker/CVE-2018-21029","tags":["advisory"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2016-10156","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-15908","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-18078","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-9445","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-15686","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-15687","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-15688","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-16864","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-16865","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-21029","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-6954","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-20386","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-3842","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-3843","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-3844","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-6454","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-13529","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-1712","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-33910","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2018-21029","description":"systemd 239 through 245 accepts any certificate signed by a trusted certificate authority for DNS Over TLS. Server Name Indication (SNI) is not sent, and there is no hostname validation with the GnuTLS backend. NOTE: This has been disputed by the developer as not a vulnerability since hostname validation does not have anything to do with this issue (i.e. there is no hostname to be sent)","status":"disputed","published":"2019-10-30T21:46:51Z","modified":"2024-08-05T12:19:27.514Z","updated_at":"2026-11-02T14:35:02.289647Z"}],"euvd":[{"id":"EUVD-2018-13551","description":"systemd 239 through 245 accepts any certificate signed by a trusted certificate authority for DNS Over TLS. Server Name Indication (SNI) is not sent, and there is no hostname validation with the GnuTLS backend. 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