CVE-2021-21604

Name: CVE-2021-21604
Creator: NVD / NIST
Published: 2021-01-13T16:15:13.523+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8/10EPSS 1.68%

Last modified Jun 17, 2026

CVE-2021-21604 is a high-severity vulnerability rated 8/10 on the CVSS scale. Jenkins 2.274 and earlier, LTS 2.263.1 and earlier allows attackers with permission to create or configure various objects to inject crafted content into Old Data Monitor that results in the instantiation of potentially unsafe objects once discarded by an administrator.. EPSS estimates a 1.68% chance of exploitation in the next 30 days.

Description

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier allows attackers with permission to create or configure various objects to inject crafted content into Old Data Monitor that results in the instantiation of potentially unsafe objects once discarded by an administrator.

Metrics

CVSS 3.1

8/10

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

EPSS Probability

1.68%

73.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-502

Affected Software

Vendor	Product	Versions
Jenkins	Jenkins	<= 2.263.1
Jenkins	Jenkins	<= 2.274

References

https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-1923Vendor Advisory
https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-1923Vendor Advisory

Timeline

Published: Jan 13, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21604?

How severe is CVE-2021-21604?

CVE-2021-21604 has a CVSS score of 8/10 (HIGH severity). The EPSS model estimates a 1.68% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21604?

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-2021-21604?

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

Scan your code now

Source: NVD / NIST