Is CVE-2018-21029 actively exploited?

CVE-2018-21029 has no public evidence of in-the-wild exploitation as of 2024-11-21.

What is the CVSS score for CVE-2018-21029?

CVE-2018-21029 has a CVSS score of 9.8 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2018-21029?

Patch guidance is available from systemd project security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2018-21029.

Fix CVE-2018-21029 - CRITICAL systemd project systemd

Q: Which products are affected by CVE-2018-21029?

2 products: systemd project systemd, fedoraproject fedora.

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)

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-295

Metadata

Primary Vendor: SYSTEMD_PROJECT
Published: 10/30/2019
Last Modified: 11/21/2024
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

systemd_project : systemdfedoraproject : fedora

Remediation Guidance

Executive Summary

Cite this page

CVE-2018-21029. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2018-21029

View on NIST NVD

CVE-2018-21029 vulnerability