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CVE-2018-21029 Details

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)

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://blog.cloudflare.com/dns-encryption-explained/	CVE	Third Party Advisory
https://github.com/systemd/systemd/blob/v239/man/resolved.conf.xml#L199-L207	CVE	ExploitThird Party Advisory
https://github.com/systemd/systemd/blob/v243/man/resolved.conf.xml#L196-L207	CVE	ExploitThird Party Advisory
https://github.com/systemd/systemd/blob/v243/src/resolve/resolved-dnstls-gnutls.c#L62-L63	CVE	PatchThird Party Advisory
https://github.com/systemd/systemd/issues/9397	CVE	Issue TrackingThird Party Advisory
https://github.com/systemd/systemd/pull/13870	CVE	PatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4NLJVOJMB6ANDILRLDZK26YGLYBEPHKY/	CVE
https://security.netapp.com/advisory/ntap-20191122-0002/	CVE	Third Party Advisory
https://tools.ietf.org/html/rfc7858#section-4.1	CVE	Third Party Advisory
https://blog.cloudflare.com/dns-encryption-explained/	[email protected]	Third Party Advisory
https://github.com/systemd/systemd/blob/v239/man/resolved.conf.xml#L199-L207	[email protected]	ExploitThird Party Advisory
https://github.com/systemd/systemd/blob/v243/man/resolved.conf.xml#L196-L207	[email protected]	ExploitThird Party Advisory
https://github.com/systemd/systemd/blob/v243/src/resolve/resolved-dnstls-gnutls.c#L62-L63	[email protected]	PatchThird Party Advisory
https://github.com/systemd/systemd/issues/9397	[email protected]	Issue TrackingThird Party Advisory
https://github.com/systemd/systemd/pull/13870	[email protected]	PatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4NLJVOJMB6ANDILRLDZK26YGLYBEPHKY/	[email protected]
https://security.netapp.com/advisory/ntap-20191122-0002/	[email protected]	Third Party Advisory
https://tools.ietf.org/html/rfc7858#section-4.1	[email protected]	Third Party Advisory

see all 18 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-295	Improper Certificate Validation	[email protected]

Affected Products

Product	Versions
systemd project systemd	>= 239, < 244
CPE cpe:2.3:a:systemd_project:systemd:::::::: Remediation No remediation found in references.
fedoraproject fedora	31
CPE cpe:2.3:o:fedoraproject:fedora:31:::::::* Remediation No remediation found in references.

Change History

17 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
Aug 5, 2024	CVE Modified	[email protected]
May 17, 2024	CVE Modified	[email protected]
May 14, 2024	CVE Modified	[email protected]
Apr 11, 2024	CVE Modified	[email protected]
Mar 21, 2024	CVE Modified	[email protected]
Nov 7, 2023	CVE Modified	[email protected]
Jul 8, 2022	Reanalysis	[email protected]
Apr 18, 2022	Modified Analysis	[email protected]
Jan 28, 2022	CPE Deprecation Remap	[email protected]
Sep 2, 2020	CVE Modified	[email protected]
Dec 20, 2019	CVE Modified	[email protected]
Nov 25, 2019	CVE Modified	[email protected]
Nov 22, 2019	CVE Modified	[email protected]
Nov 21, 2019	CVE Modified	[email protected]
Nov 6, 2019	Initial Analysis	[email protected]