# CVE-2026-79378: Bestechnic BES2300 Bluetooth SoC denial of service in L2CAP handler

Source: https://junglewise.ai/threats/cve-2026-79378-bestechnic-bes2300-bluetooth-soc-denial-of-service-in-l2cap  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-79378 · Severity: high · CVSS 7.5 · Published 2026-09-08

Bestechnic's BES2300 is a Bluetooth Audio System-on-Chip used in wireless audio devices such as earbuds and headphones. A vulnerability in the firmware's L2CAP (Logical Link Control and Adaptation Protocol) handler allows an attacker within Bluetooth range to crash the device or temporarily disable its audio functionality by sending a specially crafted packet, causing service disruption for users.

Technologies: [Bestechnic BES2300](https://junglewise.ai/threats/technologies/bes2300). Vendors: [Bestechnic](https://junglewise.ai/threats/vendors/bestechnic).

## Quick answers

**Is CVE-2026-79378 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-79378 being exploited in the wild.

**How severe is CVE-2026-79378?** High severity, with a CVSS score of 7.5, published 8 September 2026.

**Which products and versions are affected?** Bestechnic BES2300 v3.x and earlier.

**Is there a fix for CVE-2026-79378?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-79378 attacked?** It is attacked from the adjacent network, in device firmware.

**Am I affected by CVE-2026-79378?** Check whether you run Bestechnic BES2300 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability exists in the btm_acl_handle() function of BES2300 firmware v3.x and earlier, which processes Bluetooth L2CAP packets. An attacker can send a crafted L2CAP packet over the Bluetooth network that triggers an unhandled error condition, causing a denial of service (crash or hang). The attack requires Bluetooth network proximity but no authentication or user interaction. This affects the availability of Bluetooth audio services on affected devices.

## Affected products

- Bestechnic BES2300 v3.x and earlier

## Timeline

- 2026-09-08: disclosed

## References

- [http://bes2300.com/](http://bes2300.com/)
- [http://bestechnic.com/](http://bestechnic.com/)

## Related threats

- [Bestechnic BES2300 heap overflow in A2DP SBC decoder](https://junglewise.ai/threats/cve-2026-79377-bestechnic-bes2300-heap-overflow-in-a2dp-sbc-decoder)
- [Bestechnic BES2300 L2CAP denial of service](https://junglewise.ai/threats/cve-2026-79376-bestechnic-bes2300-l2cap-denial-of-service)