CVE-2021-34147

MEDIUM
6.5
CVSS Score
Published: September 7, 2021 at 06:26 AM UTC
Updated: June 17, 2026 at 03:55 AM UTC
2 products affected across 1 vendorWireless Internet Connectivity for Embedded DevicesCyw20735B1

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.6%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v ≤ 2.9.0
cypress-cyw20735b1 (environment)
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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