Vulnerability in Jenkins

CVE-2021-21671

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

EPSS: 0.017 (75.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Jenkins
Jenkins Project — versions 2.266, LTS 2.277.1, unspecified

Public proof-of-concept exploits

n0-traces/cve_

References

jenkinsci-cert@googlegroups.com (x_refsource_CONFIRM, Vendor Advisory)
jenkinsci-cert@googlegroups.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2021-21671?: CVE-2021-21671 is a high-severity vulnerability in Jenkins. CVSS score: 7.5/10. Published 2021-06-30.
How severe is CVE-2021-21671?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-21671 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.