CVE-2018-21029: Fedoraproject Fedora

Critical severity, CVSS 9.8. EPSS: 3.1% chance of exploitation in the next 30 days.

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 products

• Fedoraproject Fedora: version 31 only
• Systemd Project Systemd: from 239, before 244 (fixed in 244)

Published 2019-10-30. Last modified 2026-06-17.