CVE-2021-21619

Name: CVE-2021-21619
Creator: NVD / NIST
Published: 2021-02-24T16:15:14.983+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 9.39%

Last modified Jun 17, 2026

CVE-2021-21619 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. Jenkins Claim Plugin 2.18.1 and earlier does not escape the user display name, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers who are able to control the display names of Jenkins users, either via the security realm, or directly inside Jenkins.. EPSS estimates a 9.39% chance of exploitation in the next 30 days.

Description

Jenkins Claim Plugin 2.18.1 and earlier does not escape the user display name, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers who are able to control the display names of Jenkins users, either via the security realm, or directly inside Jenkins.

Metrics

CVSS 3.1

5.4/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

9.39%

94.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Jenkins	Claim	<= 2.18.1

References

http://www.openwall.com/lists/oss-security/2021/02/24/3Mailing List, Third Party Advisory
https://www.jenkins.io/security/advisory/2021-02-24/#SECURITY-2188%20%281%29Vendor Advisory
http://www.openwall.com/lists/oss-security/2021/02/24/3Mailing List, Third Party Advisory
https://www.jenkins.io/security/advisory/2021-02-24/#SECURITY-2188%20%281%29Vendor Advisory

Timeline

Published: Feb 24, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21619?

How severe is CVE-2021-21619?

CVE-2021-21619 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 9.39% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21619?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-21619?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST