CVE-2026-79379 in BES2300 Bluetooth Audio SoC firmware
Summary
by MITRE • 09/08/2026
A buffer overflow in the SBC_DecodeFrames() function of Bestechnic Co., Ltd BES2300 Bluetooth Audio SoC firmware v3.x and earlier and fixed in v.5.0 allows attackers to cause a Denial of Service (DoS) via sending a crafted frame.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability identified involves a critical buffer overflow condition located within the SBC_DecodeFrames() function of the Bluetooth Audio System on Chip firmware developed by Bestechnic Co., Ltd. This flaw affects versions v3.x and earlier, with remediation provided in version 5.0. The core technical issue stems from insufficient boundary checks when processing Subband Codec frames during audio decoding operations. When an attacker transmits a specially crafted frame containing malformed or excessively large data payloads, the function fails to validate the input size against the allocated buffer limits. This lack of rigorous validation allows external data to overwrite adjacent memory locations on the stack or heap, leading to unpredictable system behavior and potential control flow hijacking depending on the specific memory layout and exploit conditions.
From an operational perspective, the immediate impact is a Denial of Service condition where the affected device may crash, reboot, or become unresponsive due to the corruption of critical execution contexts. However, given that this is a buffer overflow in a firmware component handling audio streams, there is also a significant potential for remote code execution if an attacker can precisely control the overwritten memory contents. This could allow unauthorized access to sensitive data stored on the device or enable the compromise of the broader network infrastructure connected to the Bluetooth-enabled endpoint. The vulnerability highlights risks associated with embedded systems that process untrusted media inputs without adequate sanitization, a common challenge in IoT and wearable technology sectors where resource constraints often lead to simplified input handling logic.
In terms of industry standard classifications, this flaw aligns closely with CWE-120 Buffer Copy without Checking Size of Input Classic buffer overflow vulnerability. It also relates to CWE-787 Out-of-bounds Write if the overwrite extends beyond allocated boundaries in a manner that corrupts critical structures. From an offensive security framework perspective, such vulnerabilities are often leveraged during initial access or privilege escalation phases within the MITRE ATT&CK framework, particularly when targeting embedded devices with limited patching capabilities. The exploitation vector typically involves proximity-based attacks via Bluetooth Low Energy or Classic Bluetooth interfaces, requiring physical proximity to the target device unless other attack vectors like paired connection hijacking are present.
Mitigation strategies primarily involve upgrading the firmware to version 5.0 or later where this specific buffer overflow has been addressed through improved input validation and bounds checking mechanisms within the SBC_DecodeFrames() routine. For organizations unable to immediately patch, implementing network segmentation to isolate vulnerable Bluetooth-enabled devices from critical internal networks can reduce the blast radius of a potential compromise. Additionally, deploying intrusion detection systems capable of identifying anomalous Bluetooth packet structures may provide early warning indicators for exploitation attempts. Manufacturers should also adopt secure coding practices that enforce strict input validation and utilize static analysis tools during firmware development to detect similar buffer handling issues before deployment. Regular security audits and penetration testing focused on wireless protocols are essential to maintain the integrity of connected device ecosystems against evolving threat landscapes.