CVE-2021-42553

STM32 USB Host Library Buffer Overflow

Description

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.

Category

6.8
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.14%
Third-Party Advisory github.com
Affected: STMicroelectronics STM32Cube STM32 USB Host Library
Published at:
Updated at:

References

Link Tags
https://github.com/STMicroelectronics/stm32_mw_usb_host/pull/4 third party advisory patch
https://github.com/STMicroelectronics/stm32_mw_usb_host

Frequently Asked Questions

What is the severity of CVE-2021-42553?
CVE-2021-42553 has been scored as a medium severity vulnerability.
How to fix CVE-2021-42553?
To fix CVE-2021-42553, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-42553 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-42553 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-42553?
CVE-2021-42553 affects STMicroelectronics STM32Cube STM32 USB Host Library.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.