CVE-2021-42553

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.

CVSS 3.1

9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

1.3% chance of exploitation in the next 30 days; higher than 69% of CVEs (scores of 2026-10-25)

CWE

CWE-120

Published

2022-10-21

Modified

2026-10-08

Record from

the NVD, synced 2026-10-19

Affected

• st:stm32_mw_usb_host

References

• https://github.com/STMicroelectronics/stm32_mw_usb_host
• https://github.com/STMicroelectronics/stm32_mw_usb_host/pull/4
• https://github.com/STMicroelectronics/stm32_mw_usb_host
• https://github.com/STMicroelectronics/stm32_mw_usb_host/pull/4

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