CVE-2021-21699

Name: CVE-2021-21699
Creator: NVD / NIST
Published: 2021-11-12T11:15:08.007+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 88.48%

Last modified Jun 17, 2026

CVE-2021-21699 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. Jenkins Active Choices Plugin 2.5.6 and earlier does not escape the parameter name of reactive parameters and dynamic reference parameters, resulting in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Job/Configure permission.. EPSS estimates a 88.48% chance of exploitation in the next 30 days.

Description

Jenkins Active Choices Plugin 2.5.6 and earlier does not escape the parameter name of reactive parameters and dynamic reference parameters, 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

88.48%

99.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Jenkins	Active Choices	<= 2.5.6

References

http://www.openwall.com/lists/oss-security/2021/11/12/1Mailing List, Third Party Advisory
https://www.jenkins.io/security/advisory/2021-11-12/#SECURITY-2219Vendor Advisory
http://www.openwall.com/lists/oss-security/2021/11/12/1Mailing List, Third Party Advisory
https://www.jenkins.io/security/advisory/2021-11-12/#SECURITY-2219Vendor Advisory

Timeline

Published: Nov 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21699?

How severe is CVE-2021-21699?

CVE-2021-21699 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 88.48% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21699?

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-2021-21699?

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

Scan your code now

Source: NVD / NIST