CVE-2024-43766 is a medium-severity vulnerability identified in Google Android's Bluetooth Low Energy (BLE) security implementation, specifically within multiple functions of the btm_ble_sec.cc source file. The root cause is invalid error handling that leads to certain BLE communications being transmitted without encryption. This flaw violates secure communication principles by allowing sensitive data to be sent in cleartext over BLE channels. Since BLE is a wireless protocol designed for short-range communication, an attacker in close physical proximity can exploit this vulnerability to intercept information that should otherwise be protected. The vulnerability does not require any privileges or user interaction, increasing its risk profile. Affected Android versions include 14, 15, and 16, which cover a significant portion of current Android devices. The vulnerability corresponds to CWE-319, which relates to cleartext transmission of sensitive information. Although no known exploits have been reported in the wild, the lack of encryption in BLE communications can expose confidential data such as device identifiers, pairing information, or other sensitive BLE payloads. The CVSS v3.1 base score is 6.5, reflecting a medium severity with high confidentiality impact but no integrity or availability impact. No patches have been linked yet, so mitigation currently relies on defensive measures and monitoring.

The primary impact of CVE-2024-43766 is the unauthorized disclosure of sensitive information transmitted over BLE on affected Android devices. This can lead to privacy breaches, leakage of device or user data, and potential reconnaissance by attackers to facilitate further attacks. Since BLE is widely used for device pairing, health devices, wearables, and IoT communications, the vulnerability could expose sensitive personal or organizational data. The lack of encryption undermines confidentiality but does not affect data integrity or availability. Organizations with Android device fleets, especially those using BLE for critical communications or in sensitive environments, face risks of data leakage to nearby attackers. This could impact sectors such as healthcare, finance, enterprise mobility, and government, where BLE-enabled devices are prevalent. The proximity requirement limits remote exploitation but does not eliminate risk in public or semi-public spaces. The absence of required privileges or user interaction increases the likelihood of opportunistic attacks. Overall, the vulnerability could erode trust in BLE communications on Android until properly mitigated.

1. Monitor official Google Android security bulletins and update devices promptly once patches for CVE-2024-43766 are released. 2. Until patches are available, limit BLE usage in sensitive environments or disable BLE on devices where not required. 3. Employ network segmentation and physical security controls to restrict attacker proximity to BLE-enabled devices. 4. Use BLE communication protocols that implement additional encryption or application-layer security to protect sensitive data beyond the vulnerable BLE stack. 5. Conduct regular security assessments of BLE-enabled devices and applications to detect anomalous BLE traffic or unauthorized scanning. 6. Educate users and administrators about the risks of BLE communication interception and encourage cautious use in public or untrusted areas. 7. For organizations deploying custom BLE solutions, consider implementing cryptographic protections at the application layer to mitigate risks from underlying BLE vulnerabilities. 8. Monitor threat intelligence sources for any emerging exploit attempts targeting this vulnerability.