# CVE-2020-10062

## Summary

- **CVE ID:** CVE-2020-10062
- **Severity:** CRITICAL
- **CVSS Score:** 9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H)
- **CWE:** CWE-193
- **Published:** Jun 5, 2020
- **Last Modified:** Mar 14, 2026

## Description

An off-by-one error in the Zephyr project MQTT packet length decoder can result in memory corruption and possible remote code execution. NCC-ZEP-031 This issue affects: zephyrproject-rtos zephyr version 2.2.0 and later versions.

## Affected Products

- zephyrproject-rtos — zephyr (2.2.0)

## References

- [CNA](https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-84)
- [CNA](https://docs.zephyrproject.org/latest/security/vulnerabilities.html#cve-2020-10062)
- [CNA](https://github.com/zephyrproject-rtos/zephyr/pull/23821/commits/11b7a37d9a0b438270421b224221d91929843de4)
- [CNA](https://research.nccgroup.com/2020/05/26/research-report-zephyr-and-mcuboot-security-assessment)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 5.82%
- **EPSS Percentile:** 90.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._