How severe is CVE-2021-20319?

CVE-2021-20319 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-20319 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20319?

CVE-2021-20319 affects Redhat Coreos-installer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20319?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-20319 published?

CVE-2021-20319 was published on 2022-03-04 and last updated on 2026-06-17.

CVE-2021-20319

CVE-2021-20319 is a high-severity vulnerability in Redhat Coreos-installer with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-347.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-347
Affected product: Redhat Coreos-installer
Published: 2022-03-04
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-20319?: 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.
How severe is CVE-2021-20319?: CVE-2021-20319 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-20319 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20319?: CVE-2021-20319 affects Redhat Coreos-installer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20319?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-20319 published?: CVE-2021-20319 was published on 2022-03-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:redhat:coreos-installer:*:*:*:*:*:*:*:*

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