CVE-2021-31787Public exploit

Device shutdown via unsolicited LMP response flooding

Published Nov 30, 2021 · Updated Aug 3, 2024

Denial of service in Actions ATS2815 Bluetooth Classic firmware allows physically proximate attackers to shut down devices via LMP response floods. The Bluetooth Classic link manager processes continuous unsolicited LMP_features_res packets at 1.25 ms intervals without limiting the responses, causing firmware shutdown. Attackers must know the target Bluetooth address and remain in radio range; affected devices require manual power-on to restore service.

CVSS severity6.5
Medium
EPSS probability0.49%
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 Bluetooth Classic firmware allows physically proximate attackers to shut down devices via LMP response floods. The Bluetooth Classic link manager processes continuous unsolicited LMP_features_res packets at 1.25 ms intervals without limiting the responses, causing firmware shutdown. Attackers must know the target Bluetooth address and remain in radio range; affected devices require manual power-on to restore service.

The record

CVE
CVE-2021-31787
Published
Nov 30, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-770, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 30, 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

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

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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-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

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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