← Vulnerability feed

Vulnerability record · CVE-2021-31571 · published 22 April 2021

CVE-2021-31571: Amazon freertos integer overflow vulnerability

Amazon · Freertos

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

9.8 CVSS 3.1 Critical EPSS 1.4% · top 28.9% CWE-190 · Integer overflow
9.8CVSS 3.1 base score, v2 7.5
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/FreeRTOS/FreeRTOS-Kernel/commit/47338393f1f79558f6144213409f09f81d7c4837 PatchThird Party Advisory
https://github.com/FreeRTOS/FreeRTOS-Kernel/commit/47338393f1f79558f6144213409f09f81d7c4837 PatchThird Party Advisory

Track CVE-2021-31571 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2021-32020Amazon freertos memory buffer overflow vulnerabilityThe kernel in Amazon Web Services FreeRTOS before 10.4.3 has insufficient bounds checking during management of heap memory.EPSS 1.3%9.8CVE-2021-31572Amazon freertos integer overflow vulnerabilityThe kernel in Amazon Web Services FreeRTOS before 10.4.3 has an integer overflow in stream_buffer.c for a stream buffer.EPSS 1.4%9.3CVE-2026-77234Amazon freertos incorrect authorization vulnerabilityImproper input validation in FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled ports to execute code in privileged kernel…EPSS 0.17%8.3CVE-2026-77235Amazon freertos use after free vulnerabilityMissing privilege verification in the secure context cleanup handler in FreeRTOS-Kernel before 11.3.1 might allow local users to cause a use-after-fr…EPSS 0.16%8.3CVE-2026-77236Amazon freertos out-of-bounds write vulnerabilityMissing minimum size validation in secure context allocation in FreeRTOS-Kernel before 11.3.1 might allow local users to corrupt secure-world heap me…EPSS 0.16%8.2CVE-2026-77237Amazon freertos out-of-bounds read vulnerabilityMissing queue-set type validation in xQueueAddToSet() in the FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled ports with…EPSS 0.18%8.1CVE-2018-16601Amazon web services freertos vulnerabilityAn issue was discovered in Amazon Web Services (AWS) FreeRTOS through 1.3.1, FreeRTOS up to V10.0.1 (with FreeRTOS+TCP), and WITTENSTEIN WHIS Connect…EPSS 4.2%8.1CVE-2018-16525Amazon web services freertos vulnerabilityAmazon Web Services (AWS) FreeRTOS through 1.3.1, FreeRTOS up to V10.0.1 (with FreeRTOS+TCP), and WITTENSTEIN WHIS Connect middleware TCP/IP componen…EPSS 4.4%

Source: NIST National Vulnerability Database (record CVE-2021-31571), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.