Besen BS20 EV Charging Station up to 20260426 BLE/WiFi authentication replay

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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2.8$0-$5k0.00

Summaryinfo

A vulnerability was found in Besen BS20 EV Charging Station up to 20260426. It has been rated as problematic. This vulnerability affects unknown code of the component BLE/WiFi. Performing a manipulation results in authentication replay. This vulnerability is cataloged as CVE-2026-9398. The attack must originate from the local network. Furthermore, there is an exploit available. 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."

Detailsinfo

A vulnerability was found in Besen BS20 EV Charging Station up to 20260426. It has been classified as problematic. This affects an unknown function of the component BLE/WiFi. The manipulation with an unknown input leads to a authentication replay vulnerability. CWE is classifying the issue as CWE-294. A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). This is going to have an impact on integrity.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-9398. The exploitability is told to be difficult. The attack needs to approached within the local network. No form of authentication is needed for exploitation. Technical details are unknown but an exploit is available. The attack technique deployed by this issue is T1040 according to MITRE ATT&CK.

It is declared as proof-of-concept. 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."

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-31550). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.1
VulDB Meta Temp Score: 2.8

VulDB Base Score: 3.1
VulDB Temp Score: 2.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Authentication replay
CWE: CWE-294 / CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Proof-of-Concept

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

05/24/2026 Advisory disclosed
05/24/2026 +0 days VulDB entry created
05/25/2026 +1 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Not defined

CVE: CVE-2026-9398 (🔒)
GCVE (CVE): GCVE-0-2026-9398
GCVE (VulDB): GCVE-100-365379
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 05/24/2026 08:24
Updated: 05/25/2026 05:54
Changes: 05/24/2026 08:24 (53), 05/25/2026 05:54 (1)
Complete: 🔍
Submitter: carfeii
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #813577: Besen EV Charging Station BS20 EV Charger Improper Authorization (by carfeii)

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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