CVE-2021-31786

What it is

The Bluetooth Classic Audio implementation on Actions ATS2815 and ATS2819 devices does not properly handle a connection attempt from a host with the same BDAddress as the current connected BT host, allowing attackers to trigger a disconnection and deadlock of the device by connecting with a forged BDAddress that matches the original connected host.

At a glance

Exploitability

Can be exploited from the same network segment without logging in. High risk of service disruption.

Exploit odds

0.4% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2021-09-07 07:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:52 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.4% in the next 30 days (EPSS).
• Severity: 6.5 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2021-09-07 07:15 UTC

Last modified

2026-06-17 03:52 UTC

Exploit probability

0.4% · EPSS, next 30 days

Weakness

CWE-667

Record status

Modified

Affected

• actions-semi ats2819p Firmware
• actions-semi ats2815 Firmware
• actions-semi ats2819 Firmware
• actions-semi ats2819s Firmware
• actions-semi ats2819t Firmware

Attack profile CVSS 3.1 · 6.5

Attack vector

Adjacent network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-31786.md and follow it. Check whether this project is affected by CVE-2021-31786. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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