CVE-2021-21640
View name validation bypass 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 properly check that a newly created view has an allowed name. When a form to create a view is submitted, the name is included twice in the submission. One instance is validated, but the other instance is used to create the value. This allows attackers with View/Create permission to create views with invalid or already-used names. Jenkins 2.287, LTS 2.277.2 uses the same submitted value for validation and view creation.
How to fix CVE-2021-21640
To remediate CVE-2021-21640, 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-2021-21640 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 |