CVE-2021-27431: Arm Cmsis-Rtos

Critical severity, CVSS 9.8. EPSS: 1.1% chance of exploitation in the next 30 days.

ARM CMSIS RTOS2 versions prior to 2.1.3 are vulnerable to integer wrap-around inosRtxMemoryAlloc (local malloc equivalent) function, which can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or injected code execution.

Affected products

• Arm Cmsis-Rtos: up to and including 2.1.3

Published 2022-05-03. Last modified 2026-06-17.