CVE-2025-20701: Airoha Bluetooth SDK Privilege Escalation

CVE-2025-20701 Overview

CVE-2025-20701 is a high-severity authorization bypass vulnerability in the Airoha Bluetooth audio SDK that allows an attacker to pair Bluetooth audio devices without user consent. This flaw enables remote privilege escalation without requiring any additional execution privileges or user interaction, making it particularly dangerous for devices implementing the affected SDK.

Critical Impact

Attackers within Bluetooth range can silently pair with vulnerable audio devices, potentially enabling unauthorized audio interception, device control, and further privilege escalation on connected systems.

Affected Products

• Airoha Bluetooth Audio SDK (all versions prior to patched release)
• Devices implementing the Airoha Bluetooth audio stack
• Bluetooth audio peripherals using Airoha chipsets

Discovery Timeline

• 2025-08-04 - CVE-2025-20701 published to NVD
• 2025-08-04 - Last updated in NVD database

Technical Details for CVE-2025-20701

Vulnerability Analysis

This vulnerability is classified under CWE-863 (Incorrect Authorization), indicating that the Airoha Bluetooth audio SDK fails to properly verify authorization before allowing Bluetooth pairing operations. The flaw allows unauthorized parties to establish a Bluetooth connection with affected audio devices without the legitimate user's knowledge or approval.

The adjacent network attack vector means an attacker must be within Bluetooth radio range of the target device to exploit this vulnerability. However, the lack of required privileges or user interaction significantly lowers the barrier to exploitation. Once paired, an attacker could potentially intercept audio streams, inject audio content, or use the established connection as a pivot point for further attacks against connected systems.

Root Cause

The root cause is an incorrect authorization implementation (CWE-863) in the Bluetooth pairing mechanism within the Airoha SDK. The SDK fails to properly enforce user consent verification during the device pairing process, allowing the pairing handshake to complete without presenting proper authentication challenges or confirmation prompts to the user. This authorization bypass occurs at the SDK level, meaning all devices implementing this SDK inherit the vulnerability.

Attack Vector

The attack vector operates over an adjacent network (Bluetooth), requiring the attacker to be within wireless proximity of the target device. The exploitation flow involves:

1. The attacker scans for vulnerable Airoha-based Bluetooth audio devices within range
2. Upon discovery, the attacker initiates a pairing request to the target device
3. Due to the authorization flaw, the pairing request is accepted without user consent
4. The attacker establishes a trusted Bluetooth connection to the audio device
5. From this position, the attacker can intercept audio, inject content, or attempt further escalation

The vulnerability requires no user interaction and can be exploited without any special privileges, making drive-by attacks feasible in public spaces where vulnerable devices are commonly used.

Detection Methods for CVE-2025-20701

Indicators of Compromise

• Unexpected Bluetooth device pairings appearing in device connection logs
• New or unknown Bluetooth device connections that users did not initiate
• Audio devices exhibiting unusual behavior such as unexpected audio playback or connection drops
• Bluetooth activity logs showing pairing events without corresponding user actions

Detection Strategies

• Monitor Bluetooth pairing events across managed devices and alert on pairings not initiated through standard user workflows
• Implement asset inventory tracking for Bluetooth audio devices to identify those using Airoha chipsets or SDK
• Deploy endpoint detection solutions capable of monitoring Bluetooth connection state changes
• Analyze Bluetooth traffic patterns for anomalous pairing sequences characteristic of automated exploitation

Monitoring Recommendations

• Enable detailed Bluetooth logging on systems connected to vulnerable audio devices
• Review device manufacturer documentation to identify products using Airoha Bluetooth audio SDK
• Implement network segmentation to limit the impact of compromised Bluetooth peripherals
• Establish baseline Bluetooth pairing behavior to detect deviations indicative of exploitation

How to Mitigate CVE-2025-20701

Immediate Actions Required

• Consult the Airoha Product Security Bulletin for firmware updates addressing this vulnerability
• Disable Bluetooth on affected devices when not actively in use
• Avoid using vulnerable Bluetooth audio devices in high-risk or public environments
• Review and remove any unrecognized paired devices from connected systems

Patch Information

Airoha has published security information regarding this vulnerability. Organizations should review the Airoha Product Security Bulletin for specific patch availability and firmware update instructions. Contact device manufacturers directly for firmware updates applicable to consumer products implementing the Airoha Bluetooth audio SDK.

Workarounds

• Disable Bluetooth discoverable mode on affected devices to reduce attack surface
• Implement physical security controls to limit attacker proximity to vulnerable devices
• Use alternative audio connection methods (wired connections) for sensitive communications
• Consider device replacement with products using alternative Bluetooth implementations until patches are available
• Enable any available Bluetooth security features such as requiring explicit pairing confirmation