CVE-2020-10021

Name: CVE-2020-10021
Creator: NVD / NIST
Published: 2020-05-11T23:15:11.38+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.41%

Last modified Jun 17, 2026

CVE-2020-10021 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Out-of-bounds Write in the USB Mass Storage memoryWrite handler with unaligned Sizes See NCC-ZEP-024, NCC-ZEP-025, NCC-ZEP-026 This issue affects: zephyrproject-rtos zephyr version 1.14.1 and later versions. version 2.1.0 and later versions.. EPSS estimates a 0.41% chance of exploitation in the next 30 days.

Description

Out-of-bounds Write in the USB Mass Storage memoryWrite handler with unaligned Sizes See NCC-ZEP-024, NCC-ZEP-025, NCC-ZEP-026 This issue affects: zephyrproject-rtos zephyr version 1.14.1 and later versions. version 2.1.0 and later versions.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.41%

32.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Zephyrproject	Zephyr	<= 1.14.1
Zephyrproject	Zephyr	>= 2.1.0, < 2.2.0

References

https://docs.zephyrproject.org/latest/security/vulnerabilities.html#cve-2020-10021
https://github.com/zephyrproject-rtos/zephyr/pull/23240Patch, Third Party Advisory
https://github.com/zephyrproject-rtos/zephyr/pull/23455Patch, Third Party Advisory
https://github.com/zephyrproject-rtos/zephyr/pull/23456Patch, Third Party Advisory
https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-26Third Party Advisory
https://docs.zephyrproject.org/latest/security/vulnerabilities.html#cve-2020-10021
https://github.com/zephyrproject-rtos/zephyr/pull/23240Patch, Third Party Advisory
https://github.com/zephyrproject-rtos/zephyr/pull/23455Patch, Third Party Advisory
https://github.com/zephyrproject-rtos/zephyr/pull/23456Patch, Third Party Advisory
https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-26Third Party Advisory

Timeline

Published: May 11, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-10021?

How severe is CVE-2020-10021?

CVE-2020-10021 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.41% probability of exploitation in the next 30 days.

How do I fix CVE-2020-10021?

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-2020-10021?

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

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Source: NVD / NIST