CVE-2021-34268

Name: CVE-2021-34268
Creator: NVD / NIST
Published: 2021-07-22T20:15:08.323+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.6/10EPSS 0.35%

Last modified Jun 17, 2026

CVE-2021-34268 is a medium-severity vulnerability rated 4.6/10 on the CVSS scale. An issue in the USBH_ParseDevDesc() function of STMicroelectronics STM32Cube Middleware v1.8.0 and below causes a denial of service (DOS) via a malformed USB device packet.. EPSS estimates a 0.35% chance of exploitation in the next 30 days.

Description

An issue in the USBH_ParseDevDesc() function of STMicroelectronics STM32Cube Middleware v1.8.0 and below causes a denial of service (DOS) via a malformed USB device packet.

Metrics

CVSS 3.1

4.6/10

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

EPSS Probability

0.35%

27.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
St	Stm32cube Middleware	<= 1.8.0

References

https://github.com/STMicroelectronics/STM32CubeH7/issues/75Exploit, Third Party Advisory
https://github.com/STMicroelectronics/STM32CubeH7/issues/75Exploit, Third Party Advisory

Timeline

Published: Jul 22, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-34268?

An issue in the USBH_ParseDevDesc() function of STMicroelectronics STM32Cube Middleware v1.8.0 and below causes a denial of service (DOS) via a malformed USB device packet.

How severe is CVE-2021-34268?

CVE-2021-34268 has a CVSS score of 4.6/10 (MEDIUM severity). The EPSS model estimates a 0.35% probability of exploitation in the next 30 days.

How do I fix CVE-2021-34268?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-34268?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST