What’s Vulnerable › Vulnerabilities

CVE-2020-10071: Insufficient publish message length validation in MQTT

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-06-05 · updated 2026-06-17
• Weakness: CWE-120

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.

Affected products

• zephyrproject zephyr: through 2.2.0

References

• https://docs.zephyrproject.org/latest/security/vulnerabilities.html#cve-2020-10071
• https://github.com/zephyrproject-rtos/zephyr/pull/23821/commits/989c4713ba429aa5105fe476b4d629718f3e6082
• https://research.nccgroup.com/2020/05/26/research-report-zephyr-and-mcuboot-security-assessment
• https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-86
• https://docs.zephyrproject.org/latest/security/vulnerabilities.html#cve-2020-10071
• https://github.com/zephyrproject-rtos/zephyr/pull/23821/commits/989c4713ba429aa5105fe476b4d629718f3e6082
• https://research.nccgroup.com/2020/05/26/research-report-zephyr-and-mcuboot-security-assessment
• https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-86

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