CVE-2021-31787

Name: CVE-2021-31787
Creator: NVD / NIST
Published: 2021-11-30T20:15:07.477+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.49%

Last modified Jun 17, 2026

CVE-2021-31787 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. The Bluetooth Classic implementation on Actions ATS2815 chipsets does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service and shutdown of a device by flooding the target device with LMP_features_res packets.. EPSS estimates a 0.49% chance of exploitation in the next 30 days.

Description

The Bluetooth Classic implementation on Actions ATS2815 chipsets does not properly handle the reception of continuous unsolicited LMP responses, allowing attackers in radio range to trigger a denial of service and shutdown of a device by flooding the target device with LMP_features_res packets.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.49%

38.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Vendor	Product	Versions
Actions-Semi	Ats2819p Firmware	All versions
Actions-Semi	Ats2815 Firmware	All versions
Actions-Semi	Ats2819 Firmware	All versions
Actions-Semi	Ats2819s Firmware	All versions
Actions-Semi	Ats2819t Firmware	All versions

References

https://dl.packetstormsecurity.net/papers/general/braktooth.pdfBroken Link
https://launchstudio.bluetooth.com/ListingDetails/76427Third Party Advisory
https://www.actions-semi.com/index.php?id=3581&siteId=4Vendor Advisory
https://dl.packetstormsecurity.net/papers/general/braktooth.pdfBroken Link
https://launchstudio.bluetooth.com/ListingDetails/76427Third Party Advisory
https://www.actions-semi.com/index.php?id=3581&siteId=4Vendor Advisory

Timeline

Published: Nov 30, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31787?

How severe is CVE-2021-31787?

CVE-2021-31787 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.49% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31787?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-31787?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST