How severe is CVE-2021-21647?

CVE-2021-21647 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 none, integrity low, and availability none.

Is CVE-2021-21647 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21647?

CVE-2021-21647 affects Jenkins Cloudbees Cd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21647?

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

When was CVE-2021-21647 published?

CVE-2021-21647 was published on 2021-04-21 and last updated on 2026-06-17.

CVE-2021-21647

CVE-2021-21647 is a medium-severity vulnerability in Jenkins Cloudbees Cd 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: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Jenkins Cloudbees Cd
Published: 2021-04-21
Last modified: 2026-06-17

Description

Jenkins CloudBees CD Plugin 1.1.21 and earlier does not perform a permission check in an HTTP endpoint, allowing attackers with Item/Read permission to schedule builds of projects without having Item/Build permission.

Frequently asked questions

What is CVE-2021-21647?: Jenkins CloudBees CD Plugin 1.1.21 and earlier does not perform a permission check in an HTTP endpoint, allowing attackers with Item/Read permission to schedule builds of projects without having Item/Build permission.
How severe is CVE-2021-21647?: CVE-2021-21647 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 none, integrity low, and availability none.
Is CVE-2021-21647 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21647?: CVE-2021-21647 affects Jenkins Cloudbees Cd. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21647?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21647 published?: CVE-2021-21647 was published on 2021-04-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jenkins:cloudbees_cd:*:*:*:*:*:jenkins:*:*

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