How severe is CVE-2021-21620?

CVE-2021-21620 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2021-21620 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21620?

CVE-2021-21620 affects Jenkins Claim. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21620?

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

When was CVE-2021-21620 published?

CVE-2021-21620 was published on 2021-02-24 and last updated on 2026-06-17.

CVE-2021-21620

CVE-2021-21620 is a medium-severity vulnerability in Jenkins Claim 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. The underlying weakness is classified as CWE-352.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.3
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Jenkins Claim
Published: 2021-02-24
Last modified: 2026-06-17

Description

A cross-site request forgery (CSRF) vulnerability in Jenkins Claim Plugin 2.18.1 and earlier allows attackers to change claims.

Frequently asked questions

What is CVE-2021-21620?: A cross-site request forgery (CSRF) vulnerability in Jenkins Claim Plugin 2.18.1 and earlier allows attackers to change claims.
How severe is CVE-2021-21620?: CVE-2021-21620 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2021-21620 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21620?: CVE-2021-21620 affects Jenkins Claim. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21620?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21620 published?: CVE-2021-21620 was published on 2021-02-24 and last updated on 2026-06-17.

References

https://www.jenkins.io/security/advisory/2021-02-24/#SECURITY-2188%20%282%29

Affected products (1)

cpe:2.3:a:jenkins:claim:*:*:*:*:*:jenkins:*:*

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