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CVE-2026-9398: Authentication Bypass by Capture-replay in Besen BS20 EV Charging Station

0
Low
VulnerabilityCVE-2026-9398cvecve-2026-9398
Published: 05/24/2026 (05/24/2026, 20:45:08 UTC)
Source: CVE Database V5
Vendor/Project: Besen
Product: BS20 EV Charging Station

Description

A security vulnerability has been detected in Besen BS20 EV Charging Station up to 20260426. This affects an unknown part of the component BLE/WiFi. Such manipulation leads to authentication bypass by capture-replay. The attack must be carried out from within the local network. Attacks of this nature are highly complex. It is indicated that the exploitability is difficult. The original disclosure mentions, that "[t]hese vulnerabilities have been reported to Besen and we have received their acknowlegement that they are reviewing this as of April 2026."

CVSS v4.0

Score 2.3low

Attack Vector
Adjacent Network
Attack Complexity
High
Attack Requirements
None
Privileges Required
None
User Interaction
None
Vuln. Confidentiality
None
Vuln. Integrity
Low
Vuln. Availability
None
Subsq. Confidentiality
None
Subsq. Integrity
None
Subsq. Availability
None
CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

Affected software

Affected versions
=20260426

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 06/01/2026, 20:14:47 UTC

Technical Analysis

This vulnerability affects the Besen BS20 EV Charging Station's BLE/WiFi component, enabling an attacker within the local network to perform a capture-replay attack that bypasses authentication. The attack complexity is high, and no privileges or user interaction are required for exploitation. The CVSS 4.0 base score is 2.3, reflecting low severity due to the attack vector and complexity. The vendor has acknowledged the vulnerability and is reviewing it, but no official fix or patch has been published to date.

Potential Impact

Successful exploitation allows an attacker on the local network to bypass authentication mechanisms of the charging station, potentially enabling unauthorized access or control. However, the attack is highly complex and requires local network access, limiting the practical risk. There are no known exploits in the wild at this time.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since the vendor is reviewing the issue and no official fix is available, users should restrict local network access to trusted parties and monitor for vendor updates. No specific mitigations have been provided by the vendor yet.

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Technical Details

Data Version
5.2
Assigner Short Name
VulDB
Date Reserved
2026-05-24T06:19:03.634Z
Cvss Version
4.0
State
PUBLISHED
Remediation Level
null

Threat ID: 6a1365a6a5ae1af1aad23dc7

Added to database: 05/24/2026, 20:55:02 UTC

Last enriched: 06/01/2026, 20:14:47 UTC

Last updated: 07/31/2026, 19:23:00 UTC

Views: 86

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