CVE-2021-34261Public exploit

Device hang via unchecked remote-wakeup capability

Published Jul 22, 2021 · Updated Aug 4, 2024

Denial of service in STMicroelectronics STM32Cube Middleware 1.8.0 and earlier allows physically proximate attackers to hang devices. USBH_ParseCfgDesc copies a USB configuration descriptor's bmAttributes byte without checking whether the host hardware supports the requested remote-wakeup feature. A crafted USB device must be physically connected; the unsupported request makes USBH_HandleControl return FAIL and leaves the host system hung.

CVSS severity4.6
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in STMicroelectronics STM32Cube Middleware 1.8.0 and earlier allows physically proximate attackers to hang devices. USBH_ParseCfgDesc copies a USB configuration descriptor's bmAttributes byte without checking whether the host hardware supports the requested remote-wakeup feature. A crafted USB device must be physically connected; the unsupported request makes USBH_HandleControl return FAIL and leaves the host system hung.

The record

CVE
CVE-2021-34261
Published
Jul 22, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 22, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.6NIST NVDCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
2.1NIST NVDAV:L/AC:L/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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