Security readout for executives and security teams
Plain-English summary
CVE-2021-34261 is a denial-of-service issue in STMicroelectronics STM32Cube Middleware. A device using affected USB host middleware may hang when handling a remote wake-up feature, disrupting availability until the system is recovered.
Executive priority
Treat this as a targeted availability risk for embedded products using affected STM32Cube middleware. Prioritize assets where USB peripherals are user-accessible, field-replaceable, or operational downtime has safety, service, or support impact.
Technical view
The issue is reported in USBH_ParseCfgDesc() in STM32Cube Middleware v1.8.0 and below. The failure condition causes a system hang while trying to set the USB remote wake-up feature. The provided sources do not include CVSS, CWE, or detailed patch metadata.
Likely exposure
Likely exposure is firmware or products built with STMicroelectronics STM32Cube Middleware v1.8.0 or below, particularly USB host code paths. The provided affected-product metadata is incomplete and does not name specific deployed products.
Exploitation context
The source bundle does not show CISA KEV listing, active exploitation, public exploit code, or real-world abuse. Practical risk depends on whether an affected device processes USB configuration descriptors from untrusted or replaceable peripherals.
Researcher notes
Evidence is limited to the CVE description and referenced STM32CubeH7 GitHub issue. No CVSS vector, CWE, complete affected CPEs, exploit status, or definitive remediation text is present in the supplied bundle.
Mitigation direction
- Identify firmware using STM32Cube Middleware v1.8.0 or below.
- Check STMicroelectronics project guidance and issue tracker for corrected middleware versions.
- Update affected firmware after vendor validation and regression testing.
- Limit use of untrusted USB peripherals where affected firmware is deployed.
- Plan recovery procedures for devices that may hang in service.
Validation and detection
- Inventory embedded projects for STM32Cube Middleware version references.
- Review USB host usage, especially remote wake-up handling paths.
- Confirm whether USBH_ParseCfgDesc() is present in built firmware.
- Test patched firmware for USB host behavior and device stability.
- Verify product documentation reflects any firmware update or operational workaround.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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.
CVE-2021-34261 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/STMicroelectronics/STM32CubeH7/issues/78CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.