CVE-2021-31786

Bluetooth deadlock via spoofed active-host address

Published Sep 7, 2021 · Updated Aug 3, 2024

Denial of service in Actions ATS2815 and ATS2819 Bluetooth Classic Audio allows attackers to deadlock devices via a forged BDAddress. The Bluetooth link manager accepts a new host connection whose spoofed address duplicates the active host's BDAddress, disconnecting that host and entering a deadlocked state. An unauthenticated attacker in Bluetooth radio range must know and forge the connected host's address; Bluetooth communication remains unavailable until manual restart.

CVSS severity6.5
Medium
EPSS probability0.44%
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 Actions ATS2815 and ATS2819 Bluetooth Classic Audio allows attackers to deadlock devices via a forged BDAddress. The Bluetooth link manager accepts a new host connection whose spoofed address duplicates the active host's BDAddress, disconnecting that host and entering a deadlocked state. An unauthenticated attacker in Bluetooth radio range must know and forge the connected host's address; Bluetooth communication remains unavailable until manual restart.

The record

CVE
CVE-2021-31786
Published
Sep 7, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-667, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 7, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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

6.1NIST National Vulnerability DatabaseAV:A/AC:L/Au:N/C:N/I:N/A:C
6.5NIST National Vulnerability DatabaseCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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