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CVE-2018-21029
systemd 239 through 245 accepts any certificate signed by a trusted certificate authority for DNS Over TLS. Server Name Indication (SNI)…
Critical9.8EPSS 3.1%
- Published
- Updated
- Reserved
- Assigned by
- mitre
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)
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 3.1% · top 12% of all CVEs (4 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Weakness
Affected products
n/a
- affected n/a
References (9)
- https://github.com/systemd/systemd/issues/9397 (opens in a new tab)x_refsource_MISCx_transferred
- https://blog.cloudflare.com/dns-encryption-explained/ (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/systemd/systemd/blob/v243/src/resolve/resolved-dnstls-gnutls.c#L62-L63 (opens in a new tab)x_refsource_MISCx_transferred
- FEDORA-2019-4c3ce3aa5c (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- https://security.netapp.com/advisory/ntap-20191122-0002/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/systemd/systemd/pull/13870 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/systemd/systemd/blob/v243/man/resolved.conf.xml#L196-L207 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/systemd/systemd/blob/v239/man/resolved.conf.xml#L199-L207 (opens in a new tab)x_refsource_MISCx_transferred
- https://tools.ietf.org/html/rfc7858#section-4.1 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2018-21029)Record last updated .