CVE-2021-21609

Name: CVE-2021-21609
Creator: NVD / NIST
Published: 2021-01-13T16:15:13.897+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.31%

Last modified Jun 17, 2026

CVE-2021-21609 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not correctly match requested URLs to the list of always accessible paths, allowing attackers without Overall/Read permission to access some URLs as if they did have Overall/Read permission.. EPSS estimates a 1.31% chance of exploitation in the next 30 days.

Description

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not correctly match requested URLs to the list of always accessible paths, allowing attackers without Overall/Read permission to access some URLs as if they did have Overall/Read permission.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

1.31%

66.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

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-2047Vendor Advisory
https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2047Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-21609?

How severe is CVE-2021-21609?

CVE-2021-21609 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.31% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21609?

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-2021-21609?

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

Scan your code now

Source: NVD / NIST