CVE-2021-31615

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-06-25 · updated 2026-06-17
Weakness: CWE-362

Description

Unencrypted Bluetooth Low Energy baseband links in Bluetooth Core Specifications 4.0 through 5.2 may permit an adjacent device to inject a crafted packet during the receive window of the listening device before the transmitting device initiates its packet transmission to achieve full MITM status without terminating the link. When applied against devices establishing or using encrypted links, crafted packets may be used to terminate an existing link, but will not compromise the confidentiality or integrity of the link.

Affected products

Bluetooth Core Specification: from 4.0 through 5.2

References

https://bluetooth.com
https://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/injectable/
https://bluetooth.com
https://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/injectable/

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