How severe is CVE-2021-21630?

CVE-2021-21630 has a CVSS 3.x base score of 5.4, 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-2021-21630 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 72% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21630?

CVE-2021-21630 affects Jenkins Extra Columns. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21630?

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

When was CVE-2021-21630 published?

CVE-2021-21630 was published on 2021-03-30 and last updated on 2026-06-17.

CVE-2021-21630

CVE-2021-21630 is a medium-severity vulnerability in Jenkins Extra Columns with a CVSS 3.x base score of 5.4. Its EPSS exploit-prediction score of 72% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 72% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Jenkins Extra Columns
Published: 2021-03-30
Last modified: 2026-06-17

Description

Jenkins Extra Columns Plugin 1.22 and earlier does not escape parameter values in the build parameters column, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Job/Configure permission.

Frequently asked questions

What is CVE-2021-21630?: Jenkins Extra Columns Plugin 1.22 and earlier does not escape parameter values in the build parameters column, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Job/Configure permission.
How severe is CVE-2021-21630?: CVE-2021-21630 has a CVSS 3.x base score of 5.4, 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-2021-21630 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 72% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21630?: CVE-2021-21630 affects Jenkins Extra Columns. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21630?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21630 published?: CVE-2021-21630 was published on 2021-03-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jenkins:extra_columns:*:*:*:*:*:jenkins:*:*

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