CVE-2019-18614Public exploit

Bluetooth crash via undersized ACL buffers

Published Jun 16, 2020 · Updated Aug 5, 2024

Heap buffer overflow in Cypress CYW20735 firmware built with WICED Studio 6.2 or 6.4 allows attackers to crash Bluetooth via oversized ACL data. The firmware advertises 1,021-byte ACL capacity to the host while both default ACL buffers remain 384 bytes, so larger packets overwrite heap memory. Physically proximate attackers can trigger the crash before pairing with oversized L2Ping packets; local users can trigger it by opening an ACL or SCO headset connection.

CVSS severity7.8
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in Cypress CYW20735 firmware built with WICED Studio 6.2 or 6.4 allows attackers to crash Bluetooth via oversized ACL data. The firmware advertises 1,021-byte ACL capacity to the host while both default ACL buffers remain 384 bytes, so larger packets overwrite heap memory. Physically proximate attackers can trigger the crash before pairing with oversized L2Ping packets; local users can trigger it by opening an ACL or SCO headset connection.

The record

CVE
CVE-2019-18614
Published
Jun 16, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 16, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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

4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

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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

CWE-787Out-of-bounds Write
T1499.004Endpoint Denial of Service: Application 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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