CVE-2021-21671

Name: CVE-2021-21671
Creator: NVD / NIST
Published: 2021-06-30T17:15:08.987+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.71%

Last modified Jun 17, 2026

CVE-2021-21671 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Jenkins 2.299 and earlier, LTS 2.289.1 and earlier does not invalidate the previous session on login.. EPSS estimates a 1.71% chance of exploitation in the next 30 days.

Description

Jenkins 2.299 and earlier, LTS 2.289.1 and earlier does not invalidate the previous session on login.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.71%

74.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Jenkins	Jenkins	>= 2.266, < 2.300
Jenkins	Jenkins	>= 2.277.1, < 2.289.2

References

http://www.openwall.com/lists/oss-security/2021/06/30/1Mailing List, Third Party Advisory
https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2371Vendor Advisory
http://www.openwall.com/lists/oss-security/2021/06/30/1Mailing List, Third Party Advisory
https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2371Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-21671?

Jenkins 2.299 and earlier, LTS 2.289.1 and earlier does not invalidate the previous session on login.

How severe is CVE-2021-21671?

CVE-2021-21671 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.71% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21671?

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-2021-21671?

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

Scan your code now

Source: NVD / NIST