What is CVE-2020-13602?

CVE-2020-13602 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Improper Input Validation. CVSS score: 4.0/10. Published 2021-05-25.

How severe is CVE-2020-13602?

Medium severity. CVSS v3 base score is 4.0 out of 10.

Improper input validation in Zephyrproject Zephyr

CVE-2020-13602

Remote Denial of Service in LwM2M do_write_op_tlv. Zephyr versions >= 1.14.2, >= 2.2.0 contain Improper Input Validation (CWE-20), Loop with Unreachable Exit Condition ('Infinite Loop') (CWE-835). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-g9mg-fj58-6fqh

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

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

CVSS v3 metric

CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.003 (20.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Zephyrproject Zephyr
Zephyrproject-Rtos Zephyr — versions 1.14.2, 2.2.0

Weakness classification (CWE)

References

github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-g9mg-fj58-6fqh (Third Party Advisory)

Frequently asked questions

What is CVE-2020-13602?: CVE-2020-13602 is a medium-severity vulnerability in Zephyrproject Zephyr, classified under Improper Input Validation. CVSS score: 4.0/10. Published 2021-05-25.
How severe is CVE-2020-13602?: Medium severity. CVSS v3 base score is 4.0 out of 10.