CVE-2021-3917

Name: CVE-2021-3917
Creator: NVD / NIST
Published: 2022-08-23T20:15:08.36+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.22%

Last modified Jun 17, 2026

CVE-2021-3917 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. A flaw was found in the coreos-installer, where it writes the Ignition config to the target system with world-readable access permissions. This flaw allows a local attacker to have read access to potentially sensitive data. EPSS estimates a 0.22% chance of exploitation in the next 30 days.

Description

A flaw was found in the coreos-installer, where it writes the Ignition config to the target system with world-readable access permissions. This flaw allows a local attacker to have read access to potentially sensitive data. The highest threat from this vulnerability is to confidentiality.

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.22%

12.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Redhat	Coreos-Installer	< 0.10.0

References

https://access.redhat.com/security/cve/CVE-2021-3917Patch, Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2018478Issue Tracking, Vendor Advisory
https://github.com/coreos/coreos-installer/commit/2a36405339c87b16ed6c76e91ad5b76638fbdb0cPatch, Third Party Advisory
https://github.com/coreos/fedora-coreos-tracker/issues/889Issue Tracking, Patch, Third Party Advisory
https://access.redhat.com/security/cve/CVE-2021-3917Patch, Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2018478Issue Tracking, Vendor Advisory
https://github.com/coreos/coreos-installer/commit/2a36405339c87b16ed6c76e91ad5b76638fbdb0cPatch, Third Party Advisory
https://github.com/coreos/fedora-coreos-tracker/issues/889Issue Tracking, Patch, Third Party Advisory

Timeline

Published: Aug 23, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3917?

How severe is CVE-2021-3917?

CVE-2021-3917 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.22% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3917?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3917?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST