CVE-2021-32020: Amazon Freertos

Critical severity, CVSS 9.8. EPSS: 1.3% chance of exploitation in the next 30 days.

The kernel in Amazon Web Services FreeRTOS before 10.4.3 has insufficient bounds checking during management of heap memory.

Affected products

• Amazon Freertos: before 10.4.3 (fixed in 10.4.3)

Published 2021-05-03. Last modified 2026-06-17.