CVE-2021-20319

Name: CVE-2021-20319
Creator: NVD / NIST
Published: 2022-03-04T18:15:08.06+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.50%

Last modified Jun 17, 2026

CVE-2021-20319 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. An improper signature verification vulnerability was found in coreos-installer. A specially crafted gzip installation image can bypass the image signature verification and as a consequence can lead to the installation of unsigned content. EPSS estimates a 0.50% chance of exploitation in the next 30 days.

Description

An improper signature verification vulnerability was found in coreos-installer. A specially crafted gzip installation image can bypass the image signature verification and as a consequence can lead to the installation of unsigned content. An attacker able to modify the original installation image can write arbitrary data, and achieve full access to the node being installed.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.50%

38.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Redhat	Coreos-Installer	< 0.10.1

References

https://bugzilla.redhat.com/show_bug.cgi?id=2011862Issue Tracking, Vendor Advisory
https://github.com/coreos/coreos-installer/pull/659/commits/ad243c6f0eff2835b2da56ca5f7f33af76253c89Patch, Third Party Advisory
https://github.com/coreos/coreos-installer/security/advisories/GHSA-3r3g-g73x-g593Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2011862Issue Tracking, Vendor Advisory
https://github.com/coreos/coreos-installer/pull/659/commits/ad243c6f0eff2835b2da56ca5f7f33af76253c89Patch, Third Party Advisory
https://github.com/coreos/coreos-installer/security/advisories/GHSA-3r3g-g73x-g593Third Party Advisory

Timeline

Published: Mar 4, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20319?

How severe is CVE-2021-20319?

CVE-2021-20319 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.50% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20319?

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-2021-20319?

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

Scan your code now

Source: NVD / NIST