CVE-2021-34259: St STM32CUBE Middleware

Medium severity, CVSS 6.8. EPSS: 0.5% chance of exploitation in the next 30 days.

A buffer overflow vulnerability in the USBH_ParseCfgDesc() function of STMicroelectronics STM32Cube Middleware v1.8.0 and below allows attackers to execute arbitrary code.

Affected products

• St STM32CUBE Middleware: up to and including 1.8.0

Published 2021-07-22. Last modified 2026-06-17.