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CVE-2021-42553

STM32 USB Host Library Buffer Overflow

6.8 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Physical
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

1.30%Down 1.3 points since Oct 22, 2022
90%50%10%1%

What each source reports

CVE List Score used 6.8

STM32 USB Host Library Buffer Overflow

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.

Record
CVE-2021-42553
CVSS 3.1
6.8 MediumCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-120
Updated
2026-11-02
EUVDEUVD-2021-29521 6.8

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.

Record
EUVD-2021-29521
CVSS 3.1
6.8 MediumCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-vwmv-9r25-j98p 9.8

A buffer overflow vulnerability in stm32_mw_usb_host of STMicroelectronics allows an attacker to...

A buffer overflow vulnerability in stm32_mw_usb_host of STMicroelectronics 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.

Record
GHSA-vwmv-9r25-j98p
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-120
Updated
2026-11-02
NVD 6.8

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.

Record
CVE-2021-42553
CVSS 3.1
6.8 MediumCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-120
Updated
2026-11-02
OSV 9.8

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.

Record
CVE-2021-42553
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-42553 6.8

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.

Record
UBUNTU-CVE-2021-42553
CVSS 3.1
6.8 MediumCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUSN-7472-1 No score

micropython vulnerabilities

Junwha Hong and Wonil Jang discovered that Micropython incorrectly handled the length of a buffer in mp_vfs_umount, leading to a heap-based buffer overflow vulnerability. If a user or automated system were tricked into opening a specially crafted file, an attacker could possibly use this issue to cause a denial of service or possibly execute arbitrary code. (CVE-2024-8946)

Junwha Hong and Wonil Jang discovered that Micropython incorrectly handled memory, leading to a use-after-free vulnerability under certain circumstances. If a user or automated system were tricked into opening a specially crafted file, an attacker could possibly use this issue to cause a denial of service or possibly execute arbitrary code. (CVE-2024-8947)

It was discovered that Middleware USB Host MCU Component incorrectly handled memory, leading to a buffer overflow vulnerability, If a user or automated system were tricked into opening a specially crafted file, an attacker could possibly use this issue to cause a denial of service or possibly execute arbitrary code. (CVE-2021-42553)

Record
USN-7472-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
micropython
Ubuntu:Pro:20.04:LTS
before 1.12-1ubuntu0.1~esm1, plus listed versions
1.12-1
1.12-1ubuntu0.1~esm1
micropython
Ubuntu:Pro:22.04:LTS
before 1.17+ds-1.1ubuntu2+esm1, plus listed versions
1.17+ds-1ubuntu11.17+ds-1.11.17+ds-1.1ubuntu2
1.17+ds-1.1ubuntu2+esm1
micropython
Ubuntu:Pro:24.04:LTS
before 1.22.1+ds-1ubuntu0.24.04.1~esm1, plus listed versions
1.19.1+ds-11.22.1+ds-11.22.1+ds-1build11.22.1+ds-1build2
1.22.1+ds-1ubuntu0.24.04.1~esm1
micropython
Ubuntu:25.10
All versions, plus listed versions
1.24.1+ds-11.25.0+ds-1
None known
micropython
Ubuntu:26.10
All versions, plus listed versions
1.26.1+ds-1
None known
micropython
Ubuntu:26.04:LTS
All versions, plus listed versions
1.25.0+ds-11.26.1+ds-1
None known
micropython
Ubuntu:Pro:20.04:LTS
From an advisory covering 3 CVEs
before 1.12-1ubuntu0.1~esm1, plus listed versions
1.12-1
1.12-1ubuntu0.1~esm1
micropython
Ubuntu:Pro:22.04:LTS
From an advisory covering 3 CVEs
before 1.17+ds-1.1ubuntu2+esm1, plus listed versions
1.17+ds-1ubuntu11.17+ds-1.11.17+ds-1.1ubuntu2
1.17+ds-1.1ubuntu2+esm1
micropython
Ubuntu:Pro:24.04:LTS
From an advisory covering 3 CVEs
before 1.22.1+ds-1ubuntu0.24.04.1~esm1, plus listed versions
1.19.1+ds-11.22.1+ds-11.22.1+ds-1build11.22.1+ds-1build2
1.22.1+ds-1ubuntu0.24.04.1~esm1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-42553 is a medium vulnerability (CVSS 6.8) in Stmicroelectronics Stm32cube Stm32 Usb Host Library, published October 21, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.30%, the 70th percentile. Fixed in micropython 1.12-1ubuntu0.1~esm1.

References

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