CVE-2018-21029

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)

• CWE-295

• https://blog.cloudflare.com/dns-encryption-explained/Third Party Advisory
• https://github.com/systemd/systemd/blob/v239/man/resolved.conf.xml#L199-L207Exploit, Third Party Advisory
• https://github.com/systemd/systemd/blob/v243/man/resolved.conf.xml#L196-L207Exploit, Third Party Advisory
• https://github.com/systemd/systemd/blob/v243/src/resolve/resolved-dnstls-gnutls.c#L62-L63Patch, Third Party Advisory
• https://github.com/systemd/systemd/issues/9397Issue Tracking, Third Party Advisory
• https://github.com/systemd/systemd/pull/13870Patch, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4NLJVOJMB6ANDILRLDZK26YGLYBEPHKY/
• https://security.netapp.com/advisory/ntap-20191122-0002/Third Party Advisory
• https://tools.ietf.org/html/rfc7858#section-4.1Third Party Advisory
• https://blog.cloudflare.com/dns-encryption-explained/Third Party Advisory
• https://github.com/systemd/systemd/blob/v239/man/resolved.conf.xml#L199-L207Exploit, Third Party Advisory
• https://github.com/systemd/systemd/blob/v243/man/resolved.conf.xml#L196-L207Exploit, Third Party Advisory
• https://github.com/systemd/systemd/blob/v243/src/resolve/resolved-dnstls-gnutls.c#L62-L63Patch, Third Party Advisory
• https://github.com/systemd/systemd/issues/9397Issue Tracking, Third Party Advisory
• https://github.com/systemd/systemd/pull/13870Patch, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4NLJVOJMB6ANDILRLDZK26YGLYBEPHKY/
• https://security.netapp.com/advisory/ntap-20191122-0002/Third Party Advisory
• https://tools.ietf.org/html/rfc7858#section-4.1Third Party Advisory

Published

Oct 30, 2019

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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