What’s Vulnerable › Vulnerabilities

CVE-2021-31787

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-30 · updated 2026-06-17
• Weakness: CWE-770

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.

Affected products

• Actions-Semi Ats2815 Firmware: all versions
• Actions-Semi Ats2819 Firmware: all versions
• Actions-Semi Ats2819P Firmware: all versions
• Actions-Semi Ats2819S Firmware: all versions
• Actions-Semi Ats2819T Firmware: all versions

References

• https://dl.packetstormsecurity.net/papers/general/braktooth.pdf
• https://launchstudio.bluetooth.com/ListingDetails/76427
• https://www.actions-semi.com/index.php?id=3581&siteId=4
• https://dl.packetstormsecurity.net/papers/general/braktooth.pdf
• https://launchstudio.bluetooth.com/ListingDetails/76427
• https://www.actions-semi.com/index.php?id=3581&siteId=4

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