How severe is CVE-2021-39143?

CVE-2021-39143 has a CVSS 3.x base score of 6.6, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.

Is CVE-2021-39143 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39143?

CVE-2021-39143 affects Linuxfoundation Spinnaker. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-39143?

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

When was CVE-2021-39143 published?

CVE-2021-39143 was published on 2022-01-04 and last updated on 2026-06-17.

CVE-2021-39143

CVE-2021-39143 is a medium-severity vulnerability in Linuxfoundation Spinnaker with a CVSS 3.x base score of 6.6. 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-22.

Key facts

Severity: Medium (CVSS 3.x base score 6.6)
CVSS v2: 3.6
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Linuxfoundation Spinnaker
Published: 2022-01-04
Last modified: 2026-06-17

Description

Spinnaker is an open source, multi-cloud continuous delivery platform. A path traversal vulnerability was discovered in uses of TAR files by AppEngine for deployments. This uses a utility to extract files locally for deployment without validating the paths in that deployment don't override system files. This would allow an attacker to override files on the container, POTENTIALLY introducing a MITM type attack vector by replacing libraries or injecting wrapper files. Users are advised to update as soon as possible. For users unable to update disable Google AppEngine deployments and/or disable artifacts that provide TARs.

Frequently asked questions

What is CVE-2021-39143?: Spinnaker is an open source, multi-cloud continuous delivery platform. A path traversal vulnerability was discovered in uses of TAR files by AppEngine for deployments. This uses a utility to extract files locally for deployment without validating the paths in that deployment don't override system files. This would allow an attacker to override files on the container, POTENTIALLY introducing a MITM type attack vector by replacing libraries or injecting wrapper files. Users are advised to update as soon as possible. For users unable to update disable Google AppEngine deployments and/or disable artifacts that provide TARs.
How severe is CVE-2021-39143?: CVE-2021-39143 has a CVSS 3.x base score of 6.6, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability high.
Is CVE-2021-39143 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39143?: CVE-2021-39143 affects Linuxfoundation Spinnaker. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-39143?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-39143 published?: CVE-2021-39143 was published on 2022-01-04 and last updated on 2026-06-17.

References

https://github.com/spinnaker/spinnaker/security/advisories/GHSA-34jx-3vmr-56v8

Affected products (1)

cpe:2.3:a:linuxfoundation:spinnaker:*:*:*:*:*:*:*:*

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