CVE-2021-21635

Name: CVE-2021-21635
Creator: NVD / NIST
Published: 2021-03-30T12:16:10.767+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 8.76%

Last modified Jun 17, 2026

CVE-2021-21635 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. Jenkins REST List Parameter Plugin 1.3.0 and earlier does not escape a parameter name reference in embedded JavaScript, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Job/Configure permission.. EPSS estimates a 8.76% chance of exploitation in the next 30 days.

Description

Jenkins REST List Parameter Plugin 1.3.0 and earlier does not escape a parameter name reference in embedded JavaScript, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Job/Configure permission.

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

8.76%

94.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Jenkins	Rest List Parameter	<= 1.3.0

References

http://www.openwall.com/lists/oss-security/2021/03/30/1Mailing List, Third Party Advisory
https://www.jenkins.io/security/advisory/2021-03-30/#SECURITY-2261Vendor Advisory
http://www.openwall.com/lists/oss-security/2021/03/30/1Mailing List, Third Party Advisory
https://www.jenkins.io/security/advisory/2021-03-30/#SECURITY-2261Vendor Advisory

Timeline

Published: Mar 30, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21635?

How severe is CVE-2021-21635?

CVE-2021-21635 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 8.76% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21635?

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-2021-21635?

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

Scan your code now

Source: NVD / NIST