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CVE-2021-42553

6.8 · MEDIUM

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 USB…

Published Oct 21, 2022CWE-120EPSS 1.07%

Overview

CVE-2021-42553 is a medium-severity vulnerability. It was published on October 21, 2022 and has a CVSS 3.1 base score of 6.8 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.8, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/STMicroelectronics/stm32_mw_usb_hostGitHubgithub.com/STMicroelectronics/stm32_mw_usb_host/pull/4GitHubgithub.com/STMicroelectronics/stm32_mw_usb_hostGitHubgithub.com/STMicroelectronics/stm32_mw_usb_host/pull/4

How CyberStrike helps

Frequently asked questions

What is CVE-2021-42553?

CVE-2021-42553 is a medium-severity vulnerability. It was published on October 21, 2022 and has a CVSS 3.1 base score of 6.8 (MEDIUM).

How severe is CVE-2021-42553?

This vulnerability has a CVSS 3.1 base score of 6.8, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-42553?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-42553?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-42553 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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