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CVE Record

CVE-2021-34260: A buffer overflow vulnerability in the USBH_ParseInterfaceDesc() function of STMicroelectronics STM32Cube M...

A buffer overflow vulnerability in the USBH_ParseInterfaceDesc() function of STMicroelectronics STM32Cube Middleware v1.8.0 and below allows attackers to execute arbitrary code.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This CVE affects STMicroelectronics STM32Cube Middleware v1.8.0 and earlier. A flaw in USB interface descriptor parsing can overflow a buffer and may allow arbitrary code execution. Business impact depends on whether your firmware uses this middleware and processes USB devices or descriptors from untrusted sources.

Executive priority

Prioritize assessment for products that accept USB peripherals in field environments. Without confirmed exposure, CVSS, or active exploitation evidence, treat this as an inventory-and-remediation tracking issue rather than an emergency.

Technical view

The reported issue is a buffer overflow in USBH_ParseInterfaceDesc(), part of STM32Cube Middleware USB host parsing. The CVE description states arbitrary code execution is possible, but the provided sources do not include CVSS, CWE mapping, detailed affected product names, or confirmed remediation text.

Likely exposure

Likely exposure is embedded firmware built with STM32Cube Middleware v1.8.0 or below, especially products enabling USB host functionality. The source bundle does not identify specific commercial devices or CPEs.

Exploitation context

The CVE is not listed as KEV in the bundle, and no cited source states active exploitation. The public description indicates potential arbitrary code execution, but exploit maturity and required attacker proximity are not evidenced here.

Researcher notes

Evidence is sparse. The CVE states buffer overflow and arbitrary code execution, but lacks CVSS, CWE, CPEs, exploit status, and patch details in the supplied bundle. Avoid assuming all STM32Cube packages or downstream devices are affected without confirming middleware version and USB host use.

Mitigation direction

  • Inventory firmware using STM32Cube Middleware v1.8.0 or earlier.
  • Check STMicroelectronics guidance and the referenced GitHub issue for remediation details.
  • Update to a vendor-supported STM32Cube Middleware release when available.
  • Disable or restrict USB host functionality where it is not required.
  • Limit exposure to untrusted USB peripherals or descriptor sources.

Validation and detection

  • Confirm whether builds include STM32Cube USB Host middleware.
  • Check dependency manifests for STM32Cube Middleware version v1.8.0 or below.
  • Review USBH_ParseInterfaceDesc() presence in firmware source trees.
  • Verify remediation against STMicroelectronics-maintained guidance.
  • Regression test USB host behavior after any middleware update.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2021-34260 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.