The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for…
Priority LOW 30Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 devices does not properly handle the reception of LMP_max_slot with a greater ACL Length after completion of the LMP setup procedure, allowing attackers in radio range to trigger a denial of service (firmware crash) via a crafted LMP packet.
Why it matters now
EPSS 0.00586 48th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-34148
- 2026-10-03 Alias added: GHSA-6539-6fh5-h34x
References
More Cypress Wireless Internet Connectivity For Embedded Devices vulnerabilities
- TI-2021-13289 The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for… CVSS 3.1MEDIUM 6.5
- TI-2021-13287 The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for… CVSS 3.1MEDIUM 5.3
Sources
- CVE-2021-34148 · CVE Program
- CVE-2021-34148 · NVD
- FIRST EPSS
- GHSA-6539-6fh5-h34x · GitHub Advisory Database · CC BY 4.0
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