What is CVE-2021-21639?

CVE-2021-21639 is a medium-severity vulnerability in Jenkins. CVSS score: 4.3/10. Published 2021-04-07.

How severe is CVE-2021-21639?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Jenkins

CVE-2021-21639

Jenkins 2.286 and earlier, LTS 2.277.1 and earlier does not validate the type of object created after loading the data submitted to the `config.xml` REST API endpoint of a node, allowing attackers with Computer/Configure permission to replace a node with one of a different type.

EPSS: 0.027 (84.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

Affected products

Jenkins
Jenkins Project — versions unspecified

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-2021-21639?: CVE-2021-21639 is a medium-severity vulnerability in Jenkins. CVSS score: 4.3/10. Published 2021-04-07.
How severe is CVE-2021-21639?: Medium severity. CVSS v3 base score is 4.3 out of 10.