How severe is CVE-2021-21618?

CVE-2021-21618 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-2021-21618 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 82% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21618?

CVE-2021-21618 affects Jenkins Repository Connector. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21618?

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

When was CVE-2021-21618 published?

CVE-2021-21618 was published on 2021-02-24 and last updated on 2026-06-17.

CVE-2021-21618

CVE-2021-21618 is a medium-severity vulnerability in Jenkins Repository Connector with a CVSS 3.x base score of 5.4. Its EPSS exploit-prediction score of 82% 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 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 82% (100th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Jenkins Repository Connector
Published: 2021-02-24
Last modified: 2026-06-17

Description

Jenkins Repository Connector Plugin 2.0.2 and earlier does not escape parameter names and descriptions for past builds, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Item/Configure permission.

Frequently asked questions

What is CVE-2021-21618?: Jenkins Repository Connector Plugin 2.0.2 and earlier does not escape parameter names and descriptions for past builds, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Item/Configure permission.
How severe is CVE-2021-21618?: CVE-2021-21618 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-2021-21618 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 82% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21618?: CVE-2021-21618 affects Jenkins Repository Connector. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21618?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-21618 published?: CVE-2021-21618 was published on 2021-02-24 and last updated on 2026-06-17.

References

https://www.jenkins.io/security/advisory/2021-02-24/#SECURITY-2183

Affected products (1)

cpe:2.3:a:jenkins:repository_connector:*:*:*:*:*:jenkins:*:*

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