vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2018-21029

CRITICAL
9.8
CVSS Score
Published: October 30, 2019 at 09:46 PM UTC
Updated: June 17, 2026 at 01:53 AM UTC
2 products affected across 2 vendorsFedoraSystemd

Using N/A by N/A?

Get instant alerts when new vulnerabilities affect N/A - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
CRITICAL9.8
Exploit prediction
EPSS 3%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Fedora· Fedora Projectrpm
95%
31
Systemd· Systemd Project
95%
239 ≤ v < 244
Affected range stops below 244, so it looks safe — our inference, not a vendor statement

References (9)

x_refsource_MISCThird Party Advisory
Source: [email protected]
https://blog.cloudflare.com/dns-encryption-explained/
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://github.com/systemd/systemd/blob/v239/man/resolved.conf.xml#L199-L207
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://github.com/systemd/systemd/blob/v243/man/resolved.conf.xml#L196-L207
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/systemd/systemd/blob/v243/src/resolve/resolved-dnstls-gnutls.c#L62-L63
x_refsource_MISCIssue TrackingThird Party Advisory
Source: [email protected]
https://github.com/systemd/systemd/issues/9397
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/systemd/systemd/pull/13870
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4NLJVOJMB6ANDILRLDZK26YGLYBEPHKY/
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://security.netapp.com/advisory/ntap-20191122-0002/

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-295

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card