How severe is CVE-2021-3917?

CVE-2021-3917 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-3917 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3917?

CVE-2021-3917 affects Redhat Coreos-installer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3917?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-3917 published?

CVE-2021-3917 was published on 2022-08-23 and last updated on 2026-06-17.

CVE-2021-3917

CVE-2021-3917 is a medium-severity vulnerability in Redhat Coreos-installer with a CVSS 3.x base score of 5.5. 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-276.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-276
Affected product: Redhat Coreos-installer
Published: 2022-08-23
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-3917?: 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.
How severe is CVE-2021-3917?: CVE-2021-3917 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-3917 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3917?: CVE-2021-3917 affects Redhat Coreos-installer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3917?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-3917 published?: CVE-2021-3917 was published on 2022-08-23 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Redhat Coreos-installer

CVE-2021-20319 — High (CVSS 7.8): An improper signature verification vulnerability was found in coreos-installer. A specially crafted gzip installation…

All CVEs affecting Redhat Coreos-installer →

Other CWE-276 (Incorrect Default Permissions) vulnerabilities

CVE-2022-42150 — Critical (CVSS 10.0): TinyLab linux-lab v1.1-rc1 and cloud-labv0.8-rc2, v1.1-rc1 are vulnerable to insecure permissions. The default…
CVE-2020-29492 — Critical (CVSS 10.0): Dell Wyse ThinOS 8.6 and prior versions contain an insecure default configuration vulnerability. A remote…
CVE-2020-29491 — Critical (CVSS 10.0): Dell Wyse ThinOS 8.6 and prior versions contain an insecure default configuration vulnerability. A remote…
CVE-2025-40585 — Critical (CVSS 9.9): A vulnerability has been identified in Energy Services (All versions with G5DFR). Affected solutions using G5DFR…
CVE-2019-19896 — Critical (CVSS 9.9): In IXP EasyInstall 6.2.13723, there is Remote Code Execution via weak permissions on the Engine Service share. The…
CVE-2020-37129 — Critical (CVSS 9.8): Memu Play 7.1.3 contains an insecure folder permissions vulnerability that allows low-privileged users to modify the…

Browse all CWE-276 (Incorrect Default Permissions) vulnerabilities →