CVE-2021-42553: St STM32 Mw USB Host

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

A buffer overflow vulnerability in stm32_mw_usb_host of STMicroelectronics in versions before 3.5.1 allows an attacker to execute arbitrary code when the descriptor contains more endpoints than USBH_MAX_NUM_ENDPOINTS. The library is typically integrated when using a RTOS such as FreeRTOS on STM32 MCUs.

Affected products

• St STM32 Mw USB Host: before 3.5.1 (fixed in 3.5.1)

Published 2022-10-21. Last modified 2026-10-08.