CVE-2021-21639
Lack of type validation in agent related REST API in Jenkins
4.3
MEDIUM
CVSS 3.1
EPSS 0.70%
Description
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. This allows attackers with Computer/Configure permission to replace a node with one of a different type. Jenkins 2.287, LTS 2.277.2 validates the type of object created and rejects objects of unexpected types.
How to fix CVE-2021-21639
To remediate CVE-2021-21639, upgrade the affected package to a fixed version below.
- —upgrade to 2.286.1 or later
- —upgrade to 2.277.2 or later
Is CVE-2021-21639 being exploited?
Low — EPSS is 0.7%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 2.286.1
- from 0, < 2.277.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |