What is CVE-2021-4459?

CVE-2021-4459 is a medium-severity vulnerability in Sma Boy 3.0, classified under Relative Path Traversal. CVSS score: 6.5/10. Published 2025-08-27.

How severe is CVE-2021-4459?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Path Traversal in Sma Boy 3.0

CVE-2021-4459

An authorized remote attacker can access files and directories outside the intended web root, potentially exposing sensitive system information of the affected Sunny Boy devices.

EPSS: 0.007 (47.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Sma Boy 3.0 — versions 0.0.0
Sma Boy 3.6 — versions 0.0.0
Sma Boy 4.0 — versions 0.0.0
Sma Boy 5.0 — versions 0.0.0
Sma Boy 6.0 — versions 0.0.0

Weakness classification (CWE)

CWE-23 — Relative Path Traversal

References

info@cert.vde.com

Frequently asked questions

What is CVE-2021-4459?: CVE-2021-4459 is a medium-severity vulnerability in Sma Boy 3.0, classified under Relative Path Traversal. CVSS score: 6.5/10. Published 2025-08-27.
How severe is CVE-2021-4459?: Medium severity. CVSS v3 base score is 6.5 out of 10.