Security readout for executives and security teams
Plain-English summary
This issue can let someone nearby crash and restart a Bluetooth Classic device using the Cypress CYW920735Q60EVB implementation. It is a denial-of-service risk, not evidence of data theft or remote internet compromise. The public record does not name a patch or confirm active exploitation.
Executive priority
Treat this as a targeted availability risk for Bluetooth-dependent operations. Prioritize inventory and vendor confirmation before broad remediation, because the public source bundle names only a specific Cypress implementation and does not provide severity scoring or active exploitation evidence.
Technical view
The CVE describes improper handling of continuous unsolicited LMP responses after paging. A radio-range attacker can flood LMP_AU_Rand packets and trigger device restart. The confirmed affected target in the bundle is Cypress CYW920735Q60EVB; broader product impact is not established by the provided sources.
Likely exposure
Exposure appears limited to devices using the named Cypress Bluetooth Classic implementation and reachable by nearby radio attackers. Asset teams should not assume all Cypress Bluetooth products are affected without vendor confirmation.
Exploitation context
The attack requires Bluetooth radio proximity and targets availability. The bundle does not include KEV status, public exploitation evidence, CVSS scoring, or proof of weaponized exploitation beyond the BrakTooth research reference.
Researcher notes
Key gaps are affected-product breadth, vendor fix status, and real-world exploitation. Avoid expanding impact to other Cypress or Infineon devices unless vendor documentation confirms shared vulnerable firmware or stack behavior.
Mitigation direction
- Check Cypress or successor vendor guidance for firmware or product advisories.
- Inventory products using CYW920735Q60EVB or the same Bluetooth Classic implementation.
- Disable Bluetooth Classic where it is not operationally required.
- Restrict physical proximity to sensitive affected devices where practical.
- Plan replacement or compensating controls if no vendor remediation exists.
Validation and detection
- Confirm whether deployed assets use the named Cypress board or implementation.
- Review vendor firmware release notes for references to this CVE or BrakTooth.
- Correlate unexplained Bluetooth device restarts with local radio exposure.
- Document any uncertainty where product lineage cannot be confirmed.
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-2021-34146 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://www.cypress.com/documentation/datasheets/cyw20735b1-single-chip-bluetooth-transceiver-wireless-input-devicesCVE reference · x_refsource_MISC
- https://dl.packetstormsecurity.net/papers/general/braktooth.pdfCVE 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.