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CVE-2021-31785

MEDIUM
6.5
CVSS Score
Published: September 7, 2021 at 06:07 AM UTC
Updated: June 17, 2026 at 03:52 AM UTC
10 products affected across 1 vendorATS2815 FirmwareATS2819 FirmwareATS2819S Firmware

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.4%

Description

The Bluetooth Classic implementation on Actions ATS2815 and ATS2819 chipsets does not properly handle the reception of multiple LMP_host_connection_req packets, allowing attackers in radio range to trigger a denial of service (deadlock) of the device via crafted LMP packets. Manual user intervention is required to restart the device and restore Bluetooth communication.

Affected

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

ATS2815 Firmware· Actions Semi
95%
All versions
actions-semi-ats2815 (same device)
ATS2819 Firmware· Actions Semi
95%
All versions
actions-semi-ats2819 (same device)
ATS2819P Firmware· Actions Semi
95%
All versions
actions-semi-ats2819p (same device)
ATS2819S Firmware· Actions Semi
95%
All versions
actions-semi-ats2819s (same device)
ATS2819T Firmware· Actions Semi
95%
All versions
actions-semi-ats2819t (same device)
Ats2815· Actions Semidevice
80%
All versions
Ats2819· Actions Semidevice
80%
All versions
Ats2819P· Actions Semidevice
80%
All versions
Ats2819S· Actions Semidevice
80%
All versions
Ats2819T· Actions Semidevice
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 (3)

x_refsource_MISCTechnical DescriptionThird Party Advisory
Source: [email protected]
https://dl.packetstormsecurity.net/papers/general/braktooth.pdf
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://launchstudio.bluetooth.com/ListingDetails/76427
x_refsource_MISCBroken LinkVendor Advisory
Source: [email protected]
https://www.actions-semi.com/index.php?id=3581&siteId=4

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
CWE-667

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