CVE-2025-20700 is a vulnerability classified under CWE-306 (Missing Authentication for Critical Function) found in Airoha Technology Corp.'s Bluetooth audio SDKs used in AB156x, AB157x, AB158x, AB159x series, and AB1627 chipsets. The issue arises because the RACE protocol, which is accessible through the Bluetooth Low Energy (LE) Generic Attribute Profile (GATT) service, lacks proper authentication controls. This design flaw allows an unauthenticated remote attacker within Bluetooth range to access critical data and functions of the RACE protocol, effectively bypassing permission checks. The vulnerability does not require any user interaction or prior execution privileges, making it easier to exploit. Successful exploitation can lead to remote escalation of privileges, potentially granting attackers full control over the affected device's Bluetooth audio functionalities and possibly the underlying system. The vulnerability affects multiple SDK versions, including Airoha IoT SDK for BT audio v5.5.0 and earlier, and Airoha AB1561x/AB1562x/AB1563x SDK v3.3.1 and earlier. The CVSS v3.1 base score is 8.8, indicating high severity, with attack vector being adjacent (Bluetooth), low attack complexity, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability. Although no exploits have been reported in the wild yet, the vulnerability poses a significant risk due to the widespread use of these chipsets in Bluetooth audio devices such as wireless earbuds, headsets, and IoT audio peripherals. The lack of authentication on a critical protocol function exposes devices to remote compromise, potentially allowing attackers to manipulate audio data, intercept sensitive information, or disrupt device operations.

The impact of CVE-2025-20700 is substantial for organizations and consumers relying on Bluetooth audio devices powered by affected Airoha chipsets. Attackers can remotely escalate privileges without authentication or user interaction, leading to full compromise of device confidentiality, integrity, and availability. This could result in unauthorized access to sensitive audio data, manipulation or disruption of audio streams, and potential pivoting to other system components if the device firmware or OS is accessible via the compromised Bluetooth interface. Enterprises deploying these devices in sensitive environments (e.g., corporate offices, government facilities) risk data leakage and espionage. Consumer privacy is also at risk, as attackers could eavesdrop or inject malicious audio. The vulnerability could be exploited in proximity, making public spaces and workplaces with Bluetooth-enabled devices vulnerable. The absence of known patches at the time of disclosure increases exposure duration. The broad adoption of Airoha chipsets in IoT and consumer electronics amplifies the potential attack surface globally.

To mitigate CVE-2025-20700, organizations should: 1) Monitor Airoha Technology Corp. and MediaTek advisories closely for official patches or firmware updates addressing this vulnerability and apply them promptly. 2) Implement strict Bluetooth LE access controls by limiting device discoverability and pairing to trusted devices only. 3) Disable or restrict the RACE protocol usage if not essential for device operation. 4) Employ network segmentation and Bluetooth traffic monitoring to detect anomalous connection attempts or unauthorized GATT service access. 5) For device manufacturers, incorporate additional authentication layers on critical Bluetooth services in future firmware releases. 6) Educate users about the risks of connecting to unknown Bluetooth devices and encourage disabling Bluetooth when not in use. 7) Use endpoint security solutions capable of detecting unusual Bluetooth activity. These steps go beyond generic advice by focusing on protocol-specific controls and operational security tailored to this vulnerability.