CVE-2022-39344: Microsoft Azure Rtos Usbx

Critical severity, CVSS 9.8. EPSS: 2.2% chance of exploitation in the next 30 days.

Azure RTOS USBX is a USB host, device, and on-the-go (OTG) embedded stack, that is fully integrated with Azure RTOS ThreadX. Prior to version 6.1.12, the USB DFU UPLOAD functionality may be utilized to introduce a buffer overflow resulting in overwrite of memory contents. In particular cases this may allow an attacker to bypass security features or execute arbitrary code. The implementation of `ux_device_class_dfu_control_request` function prevents buffer overflow during handling of DFU UPLOAD command when current state is `UX_SYSTEM_DFU_STATE_DFU_IDLE`. This issue has been patched, please upgrade to version 6.1.12. As a workaround, add the `UPLOAD_LENGTH` check in all possible states.

Affected products

• Microsoft Azure Rtos Usbx: before 6.1.12 (fixed in 6.1.12)

Published 2022-11-04. Last modified 2026-06-17.