How severe is CVE-2021-21661?

CVE-2021-21661 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2021-21661 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21661?

CVE-2021-21661 affects Jenkins Kubernetes. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21661?

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

When was CVE-2021-21661 published?

CVE-2021-21661 was published on 2021-06-10 and last updated on 2026-06-17.

CVE-2021-21661

CVE-2021-21661 is a medium-severity vulnerability in Jenkins Kubernetes with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.0
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Jenkins Kubernetes
Published: 2021-06-10
Last modified: 2026-06-17

Description

Jenkins Kubernetes CLI Plugin 1.10.0 and earlier does not perform permission checks in several HTTP endpoints, allowing attackers with Overall/Read permission to enumerate credentials IDs of credentials stored in Jenkins.

Frequently asked questions

What is CVE-2021-21661?: Jenkins Kubernetes CLI Plugin 1.10.0 and earlier does not perform permission checks in several HTTP endpoints, allowing attackers with Overall/Read permission to enumerate credentials IDs of credentials stored in Jenkins.
How severe is CVE-2021-21661?: CVE-2021-21661 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2021-21661 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21661?: CVE-2021-21661 affects Jenkins Kubernetes. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21661?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21661 published?: CVE-2021-21661 was published on 2021-06-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jenkins:kubernetes:*:*:*:*:*:jenkins:*:*

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