CVE-2021-20319

HighCVSS 7.8/10Last modified Jun 17, 2026

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 7.8/10CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-347

Affected software

Vendor	Product	Versions
n/a	coreos-installer	Affects coreos-installer before v0.10.1, Fixed in v0.10.1.

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
NVD status: Modified

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