How severe is CVE-2021-21616?

CVE-2021-21616 has a CVSS 3.x base score of 4.6, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-21616 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 79% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21616?

CVE-2021-21616 affects Jenkins Active Choices. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21616?

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

When was CVE-2021-21616 published?

CVE-2021-21616 was published on 2021-02-24 and last updated on 2026-06-17.

CVE-2021-21616

CVE-2021-21616 is a medium-severity vulnerability in Jenkins Active Choices with a CVSS 3.x base score of 4.6. Its EPSS exploit-prediction score of 79% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.6)
CVSS v2: 3.5
EPSS exploit prediction: 79% (100th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Jenkins Active Choices
Published: 2021-02-24
Last modified: 2026-06-17

Description

Jenkins Active Choices Plugin 2.5.2 and earlier does not escape reference parameter values, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Job/Configure permission.

Frequently asked questions

What is CVE-2021-21616?: Jenkins Active Choices Plugin 2.5.2 and earlier does not escape reference parameter values, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Job/Configure permission.
How severe is CVE-2021-21616?: CVE-2021-21616 has a CVSS 3.x base score of 4.6, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-21616 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 79% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21616?: CVE-2021-21616 affects Jenkins Active Choices. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21616?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21616 published?: CVE-2021-21616 was published on 2021-02-24 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jenkins:active_choices:*:*:*:*:*:jenkins:*:*

More vulnerabilities in Jenkins Active Choices

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