What is CVE-2021-21690?

CVE-2021-21690 is a critical-severity vulnerability in Jenkins, classified under Path Traversal. CVSS score: 9.8/10. Published 2021-11-04.

How severe is CVE-2021-21690?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-21690 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Path Traversal in Jenkins

CVE-2021-21690

Agent processes are able to completely bypass file path filtering by wrapping the file operation in an agent file path in Jenkins 2.318 and earlier, LTS 2.303.2 and earlier.

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.025 (83.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Jenkins
Jenkins Project — versions unspecified

Weakness classification (CWE)

CWE-22 — Path Traversal

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

jenkinsci-cert@googlegroups.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2021-21690?: CVE-2021-21690 is a critical-severity vulnerability in Jenkins, classified under Path Traversal. CVSS score: 9.8/10. Published 2021-11-04.
How severe is CVE-2021-21690?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-21690 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.