vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2021-34148

MEDIUM
6.5
CVSS Score
Published: September 7, 2021 at 06:24 AM UTC
Updated: June 17, 2026 at 03:55 AM UTC
2 products affected across 1 vendorWireless Internet Connectivity for Embedded DevicesCyw20735B1

Using N/A by N/A?

Get instant alerts when new vulnerabilities affect N/A - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
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 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.

Affected

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

Wireless Internet Connectivity for Embedded Devices· Cypress
95%
v ≤ 2.9.0
cypress-cyw20735b1 (environment)
Cyw20735B1· Cypressdevice
80%
All versions

Remediation

No guide yet

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

Patch and advisory references

References (2)

x_refsource_MISCTechnical DescriptionThird Party Advisory
Source: [email protected]
https://dl.packetstormsecurity.net/papers/general/braktooth.pdf
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.cypress.com/documentation/datasheets/cyw20735b1-single-chip-bluetooth-transceiver-wireless-input-devices

CVSS

6.5MEDIUM[email protected]
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

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card