CVE-2024-43766 is a security vulnerability identified in the Bluetooth Low Energy (BLE) security implementation of Google Android, specifically within multiple functions of the btm_ble_sec.cc source file. The root cause is invalid error handling that leads to unencrypted communication during BLE operations. This flaw allows an attacker in close physical proximity—such as within Bluetooth range—to intercept sensitive information transmitted over BLE without needing any special privileges or user interaction. The vulnerability affects Android versions 14, 15, and 16, which represent recent and widely deployed versions of the operating system. The absence of encryption due to improper error handling compromises the confidentiality of BLE communications, potentially exposing sensitive data such as device identifiers, pairing information, or other BLE-transmitted data. The vulnerability does not require the attacker to authenticate or interact with the user, increasing the risk of silent data leakage. Although no exploits have been reported in the wild, the vulnerability is publicly disclosed and could be targeted by attackers with physical proximity to victims. The lack of a CVSS score indicates the need for a severity assessment based on technical details, which suggests a high severity given the ease of exploitation and confidentiality impact. No official patches or mitigations are currently linked, emphasizing the need for vigilance and proactive security measures.

The primary impact of CVE-2024-43766 is the potential unauthorized disclosure of sensitive information transmitted over BLE on affected Android devices. This can compromise user privacy and confidentiality, especially in environments where BLE is used for sensitive data exchange such as health monitoring, access control, or secure device pairing. Organizations relying on Android mobile devices for business operations, especially those using BLE-enabled applications, risk data leakage that could lead to further targeted attacks or privacy violations. The vulnerability's exploitation requires physical proximity, limiting remote attack scenarios but increasing risk in crowded or public spaces. The lack of user interaction or elevated privileges needed makes the attack stealthy and easier to execute. This could undermine trust in Android BLE security and impact sectors such as healthcare, finance, government, and enterprise mobility where BLE is prevalent. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits following public disclosure.

To mitigate CVE-2024-43766, organizations and users should: 1) Monitor official Google Android security bulletins and apply patches promptly once available for affected versions 14, 15, and 16. 2) Disable BLE functionality on devices when not in use to reduce exposure surface. 3) Employ BLE security best practices such as enforcing strong pairing methods and using application-level encryption to protect sensitive data beyond the BLE layer. 4) Implement physical security controls to limit attacker proximity in sensitive environments, including secure zones where BLE devices operate. 5) Use mobile device management (MDM) solutions to enforce security policies and restrict BLE usage if feasible. 6) Educate users about the risks of BLE communications in public or untrusted spaces. 7) Consider network-level BLE monitoring tools that can detect anomalous BLE traffic patterns indicative of exploitation attempts. These steps go beyond generic advice by focusing on BLE-specific controls and operational security tailored to the vulnerability's characteristics.