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Vulnerabilities / CVE-2018-21029

critical

CVE-2018-21029

systemd: incorrect certificate validation results in acceptance of any certificate signed by a trusted certificate authority for DNS over TLS

Published Modified CWE 295
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat6.3CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

Trivy's own label is CRITICAL. Rated critical by NVD, CBL-Mariner. Rated lower by Red Hat (medium).

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)

Affected packages and fixed versions

SourcePackageFixed in
CBL-Mariner 1.0systemd0:239-31.cm1
debian 11systemd244-1
debian 12systemd244-1
debian 13systemd244-1
debian 14systemd244-1
echosystemd244-1
root.io debian 12rootio-systemd244-1
root.io debian 13rootio-systemd244-1

References

All 12 references

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.