CVE-2021-3917

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-08-23 · updated 2026-06-17
Weakness: CWE-276

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.

Affected products

coreos-installer: before 0.10.0 — fixed in 0.10.0

How to fix

Upgrade to a fixed version: coreos-installer 0.10.0. Check the vendor advisory for mitigations.

References

https://access.redhat.com/security/cve/CVE-2021-3917
https://bugzilla.redhat.com/show_bug.cgi?id=2018478
https://github.com/coreos/coreos-installer/commit/2a36405339c87b16ed6c76e91ad5b76638fbdb0c
https://github.com/coreos/fedora-coreos-tracker/issues/889
https://access.redhat.com/security/cve/CVE-2021-3917
https://bugzilla.redhat.com/show_bug.cgi?id=2018478
https://github.com/coreos/coreos-installer/commit/2a36405339c87b16ed6c76e91ad5b76638fbdb0c
https://github.com/coreos/fedora-coreos-tracker/issues/889

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