CVE-2020-10070

MQTT buffer overflow on receive buffer

9.0 Critical

In the Zephyr Project MQTT code, improper bounds checking can result in memory corruption and possibly remote code execution. NCC-ZEP-031 This issue affects: zephyrproject-rtos zephyr version 2.2.0 and later versions.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

2.88%Up 1.0 points since Apr 14, 2021

What each source reports

CVE List Score used 9.0

MQTT buffer overflow on receive buffer

Record: CVE-2020-10070
CVSS 3.1: 9.0 CriticalCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-120, CWE-190
Updated: 2026-11-02

EUVDEUVD-2020-2535 9.0

Record: EUVD-2020-2535
CVSS 3.1: 9.0 CriticalCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated: 2026-11-03

GitHub AdvisoriesGHSA-wj3q-4vgj-mfw8 No score

In the Zephyr Project MQTT code, improper bounds checking can result in memory corruption and...

Record: GHSA-wj3q-4vgj-mfw8
Updated: 2026-11-02

NVD 9.0

Record: CVE-2020-10070
CVSS 3.1: 9.0 CriticalCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-120, CWE-190
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-10070 is a critical vulnerability (CVSS 9.0) in Zephyrproject Zephyr, published June 5, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.88%, the 86th percentile. No source names a fixed version.