CVE-2020-10071

Name: CVE-2020-10071
Creator: NVD / NIST
Published: 2020-06-05T18:15:13.087+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.40%

Last modified Jun 17, 2026

CVE-2020-10071 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The Zephyr MQTT parsing code performs insufficient checking of the length field on publish messages, allowing a buffer overflow and potentially remote code execution. NCC-ZEP-031 This issue affects: zephyrproject-rtos zephyr version 2.2.0 and later versions.. EPSS estimates a 3.40% chance of exploitation in the next 30 days.

Description

The Zephyr MQTT parsing code performs insufficient checking of the length field on publish messages, allowing a buffer overflow and potentially remote code execution. NCC-ZEP-031 This issue affects: zephyrproject-rtos zephyr version 2.2.0 and later versions.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.40%

87.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Zephyrproject	Zephyr	<= 2.2.0

References

https://docs.zephyrproject.org/latest/security/vulnerabilities.html#cve-2020-10071Vendor Advisory
https://github.com/zephyrproject-rtos/zephyr/pull/23821/commits/989c4713ba429aa5105fe476b4d629718f3e6082Patch, Third Party Advisory
https://research.nccgroup.com/2020/05/26/research-report-zephyr-and-mcuboot-security-assessmentThird Party Advisory
https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-86Third Party Advisory
https://docs.zephyrproject.org/latest/security/vulnerabilities.html#cve-2020-10071Vendor Advisory
https://github.com/zephyrproject-rtos/zephyr/pull/23821/commits/989c4713ba429aa5105fe476b4d629718f3e6082Patch, Third Party Advisory
https://research.nccgroup.com/2020/05/26/research-report-zephyr-and-mcuboot-security-assessmentThird Party Advisory
https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-86Third Party Advisory

Timeline

Published: Jun 5, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-10071?

How severe is CVE-2020-10071?

CVE-2020-10071 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.40% probability of exploitation in the next 30 days.

How do I fix CVE-2020-10071?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-10071?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST