# CVE-2026-9394: Besen BS20 EV Charging Station weak authentication in BLE handler

Source: https://junglewise.ai/threats/cve-2026-9394-besen-bs20-ev-charging-station-weak-authentication-in-ble-handler  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-24. Updated: 2026-05-26  
License: CC BY 4.0 with a link back

CVE-2026-9394 · Severity: low · CVSS 3.1 · Published 2026-05-24

The Besen BS20 EV Charging Station is a home electric vehicle charger. A vulnerability in its Bluetooth Low Energy (BLE) handler allows attackers within physical proximity to potentially gain unauthorized access to the device. This is due to the use of weak, 6-digit numeric passwords and a lack of protection against offline password cracking, which could allow an attacker to take control of the charging station's settings.

Technologies: [Besen BS20 EV Charging Station](https://junglewise.ai/threats/technologies/bs20-ev-charging-station). Vendors: [Besen](https://junglewise.ai/threats/vendors/besen).

## Quick answers

**Is CVE-2026-9394 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9394 being exploited in the wild.

**How severe is CVE-2026-9394?** Low severity, with a CVSS score of 3.1, published 24 May 2026.

**Which products and versions are affected?** Besen BS20 EV Charging Station up to 20260426.

**Is there a fix for CVE-2026-9394?** 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-2026-9394 attacked?** It is attacked from the adjacent network, in a network appliance.

**Am I affected by CVE-2026-9394?** Check whether you run Besen BS20 EV Charging Station 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 Besen BS20 EV Charging Station (up to version 20260426) contains a weak authentication mechanism in its Bluetooth Low Energy (BLE) Handler. The device enforces a fixed 6-digit numeric password format, which limits the entropy to 1,000,000 combinations. Furthermore, the BLE authentication handshake can be captured by an attacker within radio range and subjected to offline brute-force cracking. Successful exploitation allows an attacker to recover credentials and gain unauthorized control over the device. The attack is considered high complexity as it requires capturing specific wireless traffic and performing offline analysis. As of April 2026, the vendor has acknowledged the report and is reviewing the findings.

## Affected products

- Besen BS20 EV Charging Station up to 20260426

## Timeline

- 2026-04-26: disclosed: Vulnerabilities reported to vendor and acknowledged.
- 2026-05-24: advisory: Initial disclosure via VulDB and NVD.

## References

- [https://github.com/carfeii/besen](https://github.com/carfeii/besen)
- [https://vuldb.com/submit/813569](https://vuldb.com/submit/813569)
- [https://vuldb.com/vuln/365375](https://vuldb.com/vuln/365375)
- [https://vuldb.com/vuln/365375/cti](https://vuldb.com/vuln/365375/cti)

## Related threats

- [Besen BS20 EV Charging Station authentication bypass in BLE/WiFi](https://junglewise.ai/threats/cve-2026-9398-besen-bs20-ev-charging-station-authentication-bypass-in-ble-wifi)
- [Besen BS20 EV Charging Station improper authorization in OTA Update Handler](https://junglewise.ai/threats/cve-2026-9397-besen-bs20-ev-charging-station-improper-authorization-in-ota)
- [Besen BS20 EV Charging Station UI spoofing in Firmware Version Check](https://junglewise.ai/threats/cve-2026-9396-besen-bs20-ev-charging-station-ui-spoofing-in-firmware-version)
- [Besen BS20 EV Charging Station cleartext credential exposure in BLE/UDP](https://junglewise.ai/threats/cve-2026-9395-besen-bs20-ev-charging-station-cleartext-credential-exposure-in)