CVE-2021-31571

Name: CVE-2021-31571
Creator: NVD / NIST
Published: 2021-04-22T18:15:08.52+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.38%

Last modified Jun 17, 2026

CVE-2021-31571 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. The kernel in Amazon Web Services FreeRTOS before 10.4.3 has an integer overflow in queue.c for queue creation.. EPSS estimates a 1.38% chance of exploitation in the next 30 days.

Description

The kernel in Amazon Web Services FreeRTOS before 10.4.3 has an integer overflow in queue.c for queue creation.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.38%

68.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-190

Affected Software

Vendor	Product	Versions
Amazon	Freertos	< 10.4.3

References

https://github.com/FreeRTOS/FreeRTOS-Kernel/commit/47338393f1f79558f6144213409f09f81d7c4837Patch, Third Party Advisory
https://github.com/FreeRTOS/FreeRTOS-Kernel/commit/47338393f1f79558f6144213409f09f81d7c4837Patch, Third Party Advisory

Timeline

Published: Apr 22, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31571?

The kernel in Amazon Web Services FreeRTOS before 10.4.3 has an integer overflow in queue.c for queue creation.

How severe is CVE-2021-31571?

CVE-2021-31571 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.38% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31571?

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-2021-31571?

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

Scan your code now

Source: NVD / NIST