How severe is CVE-2021-34268?

CVE-2021-34268 has a CVSS 3.x base score of 4.6, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-34268 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-34268?

CVE-2021-34268 affects St Stm32cube Middleware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-34268?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-34268 published?

CVE-2021-34268 was published on 2021-07-22 and last updated on 2026-06-17.

CVE-2021-34268

CVE-2021-34268 is a medium-severity vulnerability in St Stm32cube Middleware with a CVSS 3.x base score of 4.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 4.6)
CVSS v2: 2.1
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: St Stm32cube Middleware
Published: 2021-07-22
Last modified: 2026-06-17

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.

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 3.x base score of 4.6, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-34268 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34268?: CVE-2021-34268 affects St Stm32cube Middleware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-34268?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-34268 published?: CVE-2021-34268 was published on 2021-07-22 and last updated on 2026-06-17.

References

https://github.com/STMicroelectronics/STM32CubeH7/issues/75

Affected products (1)

cpe:2.3:a:st:stm32cube_middleware:*:*:*:*:*:*:*:*

More vulnerabilities in St Stm32cube Middleware

CVE-2021-34262 — Medium (CVSS 6.8): A buffer overflow vulnerability in the USBH_ParseEPDesc() function of STMicroelectronics STM32Cube Middleware v1.8.0…
CVE-2021-34260 — Medium (CVSS 6.8): A buffer overflow vulnerability in the USBH_ParseInterfaceDesc() function of STMicroelectronics STM32Cube Middleware…
CVE-2021-34259 — Medium (CVSS 6.8): A buffer overflow vulnerability in the USBH_ParseCfgDesc() function of STMicroelectronics STM32Cube Middleware v1.8.0…
CVE-2021-34267 — Medium (CVSS 4.6): An in the USBH_MSC_InterfaceInit() function of STMicroelectronics STM32Cube Middleware v1.8.0 and below causes a denial…
CVE-2021-34261 — Medium (CVSS 4.6): An issue in USBH_ParseCfgDesc() of STMicroelectronics STM32Cube Middleware v1.8.0 and below causes a denial of service…

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