OpenSynergy BlueSDK Improper Input Validation Vulnerability Allowing L2CAP Channel Manipulation

A vulnerability exists in OpenSynergy BlueSDK versions through 6.x, specifically within the Bluetooth stack. The issue arises from improper validation of remote L2CAP channel IDs, allowing an attacker to create an L2CAP channel with a null identifier as the remote CID. This vulnerability could potentially be exploited before the pairing process, depending on the implementation by the end developer.

Impact

Exploitation of this vulnerability allows for the creation of L2CAP channels with null identifiers, which could be leveraged in conjunction with other vulnerabilities in the BlueSDK stack to achieve remote code execution on the affected device.

Remediation

OpenSynergy has released patches for this vulnerability, but not all OEMs received the update until June 2025. Users should check with their device manufacturer for the availability of the patch.