CVE-2021-3431

Name: CVE-2021-3431
Creator: NVD / NIST
Published: 2022-06-28T20:15:08.083+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.83%

Last modified Jun 17, 2026

CVE-2021-3431 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Assertion reachable with repeated LL_FEATURE_REQ. Zephyr versions >= v2.5.0 contain Reachable Assertion (CWE-617). EPSS estimates a 0.83% chance of exploitation in the next 30 days.

Description

Assertion reachable with repeated LL_FEATURE_REQ. Zephyr versions >= v2.5.0 contain Reachable Assertion (CWE-617). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7548-5m6f-mqv9

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.83%

52.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Zephyrproject	Zephyr	>= 2.5.0, < 2.6.0

References

http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7548-5m6f-mqv9Vendor Advisory
http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7548-5m6f-mqv9Vendor Advisory

Timeline

Published: Jun 28, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3431?

How severe is CVE-2021-3431?

CVE-2021-3431 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.83% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3431?

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-2021-3431?

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

Scan your code now

Source: NVD / NIST