CVE-2018-21029
CVSS v3
9.8
CRITICAL
EPSS Score
3.1 %
exploit probability, as of 2026-10-19
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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Affected and fixed versions
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
- CVE-2018-21029 Red Hat Product Security
systemd: incorrect certificate validation results in acceptance of any certificate signed by a trusted certificate authority for DNS over TLS
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)
Technical details
- Published
- 2019-10-30
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.