CVE-2021-21607

Name: CVE-2021-21607
Creator: NVD / NIST
Published: 2021-01-13T16:15:13.74+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.44%

Last modified Jun 17, 2026

CVE-2021-21607 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not limit sizes provided as query parameters to graph-rendering URLs, allowing attackers to request crafted URLs that use all available memory in Jenkins, potentially leading to out of memory errors.. EPSS estimates a 1.44% chance of exploitation in the next 30 days.

Description

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not limit sizes provided as query parameters to graph-rendering URLs, allowing attackers to request crafted URLs that use all available memory in Jenkins, potentially leading to out of memory errors.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.44%

69.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

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-2025Vendor Advisory
https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2025Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-21607?

How severe is CVE-2021-21607?

CVE-2021-21607 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.44% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21607?

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-2021-21607?

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

Scan your code now

Source: NVD / NIST