Staging Environment: Content and features may be unstable or change without notice.
Search for vulnerabilities
Vulnerability details: VCID-sdnj-avfk-7bch
Vulnerability ID VCID-sdnj-avfk-7bch
Aliases CVE-2018-21029
Summary systemd: incorrect certificate validation results in acceptance of any certificate signed by a trusted certificate authority for DNS over TLS
Status Disputed
Exploitability 0.5
Weighted Severity 8.8
Risk 4.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-295 Improper Certificate Validation
System Score Found at
cvssv3 6.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-21029.json
epss 0.0156 https://api.first.org/data/v1/epss?cve=CVE-2018-21029
epss 0.0156 https://api.first.org/data/v1/epss?cve=CVE-2018-21029
epss 0.0156 https://api.first.org/data/v1/epss?cve=CVE-2018-21029
epss 0.0156 https://api.first.org/data/v1/epss?cve=CVE-2018-21029
epss 0.0156 https://api.first.org/data/v1/epss?cve=CVE-2018-21029
epss 0.0156 https://api.first.org/data/v1/epss?cve=CVE-2018-21029
epss 0.0156 https://api.first.org/data/v1/epss?cve=CVE-2018-21029
epss 0.0156 https://api.first.org/data/v1/epss?cve=CVE-2018-21029
epss 0.0156 https://api.first.org/data/v1/epss?cve=CVE-2018-21029
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2018-21029
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2018-21029
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-21029.json
https://api.first.org/data/v1/epss?cve=CVE-2018-21029
https://blog.cloudflare.com/dns-encryption-explained/
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-21029
https://github.com/systemd/systemd/blob/v239/man/resolved.conf.xml#L199-L207
https://github.com/systemd/systemd/blob/v243/man/resolved.conf.xml#L196-L207
https://github.com/systemd/systemd/blob/v243/src/resolve/resolved-dnstls-gnutls.c#L62-L63
https://github.com/systemd/systemd/issues/9397
https://github.com/systemd/systemd/pull/13870
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4NLJVOJMB6ANDILRLDZK26YGLYBEPHKY/
https://security.netapp.com/advisory/ntap-20191122-0002/
https://tools.ietf.org/html/rfc7858#section-4.1
1771725 https://bugzilla.redhat.com/show_bug.cgi?id=1771725
cpe:2.3:a:systemd_project:systemd:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:systemd_project:systemd:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
CVE-2018-21029 https://nvd.nist.gov/vuln/detail/CVE-2018-21029
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-21029.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2018-21029
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2018-21029
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.81414
EPSS Score 0.0156
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-03T10:22:55.299723+00:00 NVD CVE Status Improver Improve https://cveawg.mitre.org/api/cve/CVE-2018-21029 38.1.0
2026-04-01T14:23:52.558349+00:00 RedHat Importer Import https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-21029.json 38.0.0