CVE-2021-34146Public exploit

Device restart via unsolicited LMP response flooding

Published Sep 7, 2021 · Updated Aug 4, 2024

Denial of service in Cypress CYW920735Q60EVB Bluetooth Classic firmware allows physically proximate attackers to crash and restart the device. The link manager continues processing unsolicited LMP_AU_Rand responses after paging, so a sustained packet flood resets the controller. Exploitation requires Bluetooth radio range and crafted Link Manager Protocol traffic; the demonstrated consequence is a reboot, not data access or modification.

CVSS severity6.5
Medium
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Cypress CYW920735Q60EVB Bluetooth Classic firmware allows physically proximate attackers to crash and restart the device. The link manager continues processing unsolicited LMP_AU_Rand responses after paging, so a sustained packet flood resets the controller. Exploitation requires Bluetooth radio range and crafted Link Manager Protocol traffic; the demonstrated consequence is a reboot, not data access or modification.

The record

CVE
CVE-2021-34146
Published
Sep 7, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.1NIST NVDAV:A/AC:L/Au:N/C:N/I:N/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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