CVE-2026-9397

HIGH 8.1

Besen BS20 EV Charging Station OTA Update Installation improper authorization

CVSS Score

8.1

EPSS Score

0.0%

EPSS Percentile

12th

A weakness has been identified in Besen BS20 EV Charging Station up to 20260426. Affected by this issue is some unknown functionality of the component OTA Update Installation Handler. This manipulation causes improper authorization. The attack is possible to be carried out remotely. A high degree of complexity is needed for the attack. The exploitation is known to be 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."

CWE	CWE-285 CWE-266
Vendor	besen
Product	bs20 ev charging station
Published	May 24, 2026
Last Updated	May 26, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

Besen / BS20 EV Charging Station

20260426

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/vuln/365378 vuldb.com: https://vuldb.com/vuln/365378/cti vuldb.com: https://vuldb.com/submit/813576 github.com: https://github.com/carfeii/besen#finding-4-unauthorized-firmware-installation-via-spoofed-ota-updates

Credits

🔍 carfeii (VulDB User) VulDB CNA Team