CVE-2026-9397Network attack vector

Full device compromise via bypassed OTA validation

Published May 24, 2026 · Updated May 24, 2026

Improper authorization in Besen BS20 EV Charging Station 20260426 and earlier allows remote attackers to install malicious firmware via OTA updates. The handler accepts attacker-supplied firmware from a spoofed update server as legitimate after its built-in validation checks are bypassed. Exploitation requires no privileges or user interaction but has high attack complexity; accepted firmware grants full device control, including manipulation of charging behavior.

CVSS severity8.1
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Besen BS20 EV Charging Station 20260426 and earlier allows remote attackers to install malicious firmware via OTA updates. The handler accepts attacker-supplied firmware from a spoofed update server as legitimate after its built-in validation checks are bypassed. Exploitation requires no privileges or user interaction but has high attack complexity; accepted firmware grants full device control, including manipulation of charging behavior.

The record

CVE
CVE-2026-9397
Published
May 24, 2026
Updated
May 24, 2026
Vendor
BESEN INTERNATIONAL GROUP CO., LTD.
Product
BS20 EV Charging Station
Classifications
CWE-285, CWE-266, T1601.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 24, 2026CVE publishedPublication date reported by the CVE source.
  2. May 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=20260426

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

BESEN INTERNATIONAL GROUP CO., LTD. · BS20 EV Charging Stationversion=20260426

Published CVSS scores

8.2VulDBCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
8.1VulDBCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
7.6VulDBAV:N/AC:H/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-285Improper Authorization
CWE-266Incorrect Privilege Assignment
T1601.001Modify System Image: System Firmware

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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