CVE-2021-34267: St STM32CUBE Middleware

Medium severity, CVSS 4.6. EPSS: 0.4% chance of exploitation in the next 30 days.

An in the USBH_MSC_InterfaceInit() function of STMicroelectronics STM32Cube Middleware v1.8.0 and below causes a denial of service (DOS) when the system tries to communicate with the connected endpoint.

Affected products

• St STM32CUBE Middleware: up to and including 1.8.0

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