What is CVE-2021-3223?

CVE-2021-3223 is a high-severity vulnerability in Nodered Node-Red-Dashboard, classified under Path Traversal. CVSS score: 7.5/10. Published 2021-01-26.

How severe is CVE-2021-3223?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2021-3223 known to be exploited?

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

Path Traversal in Nodered Node-Red-Dashboard

CVE-2021-3223

Node-RED-Dashboard before 2.26.2 allows ui_base/js/..%2f directory traversal to read files.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2021-01-26 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.185 (97.2th percentile), scored 2026-10-09.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.185 · newest: 0.185 · change: 0.000

Affected products

Nodered Node-Red-Dashboard

Weakness classification (CWE)

CWE-22 — Path Traversal

Public proof-of-concept exploits

References

github.com/node-red/node-red-dashboard/issues/669 (Third Party Advisory)
github.com/node-red/node-red-dashboard/releases/tag/2.26.2 (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2021-3223?: CVE-2021-3223 is a high-severity vulnerability in Nodered Node-Red-Dashboard, classified under Path Traversal. CVSS score: 7.5/10. Published 2021-01-26.
How severe is CVE-2021-3223?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-3223 known to be exploited?: 13 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.