Besen BS20 EV Charging Station up to 20260426 OTA Update Installation improper authorization

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Besen BS20 EV Charging Station up to 20260426. It has been declared as critical. This affects an unknown part of the component OTA Update Installation Handler. Such manipulation leads to improper authorization. This vulnerability is listed as CVE-2026-9397. The attack may be performed from remote. In addition, an exploit is 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 and classified as critical. Affected by this issue is some unknown processing of the component OTA Update Installation Handler. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-9397. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are unknown but an exploit is available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 05/25/2026). This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

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-2026-31551). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.1
VulDB Meta Temp Score: 7.4

VulDB Base Score: 8.1
VulDB Temp Score: 7.4
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: Improper authorization
CWE: CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

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-2026-9397 (🔒)
GCVE (CVE): GCVE-0-2026-9397
GCVE (VulDB): GCVE-100-365378
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 #813576: Besen EV Charging Station BS20 EV Charger Embedded Malicious Code (by carfeii)

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion

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