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TI-2021-13289 Aliases CVE-2021-34147GHSA-m739-9w4c-mx4g

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 does not properly handle the reception of a malformed LMP timing accuracy response followed by multiple reconnections to the link slave, allowing attackers to exhaust device BT resources and eventually trigger a crash via multiple attempts of sending a crafted LMP timing accuracy response followed by a sudden reconnection with a random BDAddress.

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

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:cypress:wireless_internet_connectivity_for_embedded_devices:*:*:*:*:*:*:*:*up to 2.9.0VulnerableCypress
cpe:2.3:h:cypress:cyw20735b1:-:*:*:*:*:*:*:*not specified by NVDRunning onCypress
  • cpe:2.3:o:cypress:wireless_internet_connectivity_for_embedded_devices:*:*:*:*:*:*:*:* Versions up to 2.9.0 Vulnerable ·Cypress
  • cpe:2.3:h:cypress:cyw20735b1:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cypress

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-34147
  2. 2026-10-03 Alias added: GHSA-m739-9w4c-mx4g

References

Advisory 2

  • TI-2021-13290 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

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences