What is CVE-2020-13599?

CVE-2020-13599 is a low-severity vulnerability in Zephyrproject Zephyr, classified under Incorrect Default Permissions. CVSS score: 3.3/10. Published 2021-05-25.

How severe is CVE-2020-13599?

Low severity. CVSS v3 base score is 3.3 out of 10.

Vulnerability in Zephyrproject Zephyr

CVE-2020-13599

Security problem with settings and littlefs. Zephyr versions >= 1.14.2, >= 2.3.0 contain Incorrect Default Permissions (CWE-276). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-5qhg-j6wc-4f6q

Published 2021-05-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.002 (12.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 12.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Zephyrproject Zephyr
Zephyrproject-Rtos Zephyr — versions 1.14.2, 2.3.0

Weakness classification (CWE)

CWE-276 — Incorrect Default Permissions

References

github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-5qhg-j6wc-4f6q (Third Party Advisory)
www.talosintelligence.com/vulnerability_reports/TALOS-2020-1199 (Third Party Advisory, Not Applicable)

Frequently asked questions

What is CVE-2020-13599?: CVE-2020-13599 is a low-severity vulnerability in Zephyrproject Zephyr, classified under Incorrect Default Permissions. CVSS score: 3.3/10. Published 2021-05-25.
How severe is CVE-2020-13599?: Low severity. CVSS v3 base score is 3.3 out of 10.