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Description

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."

PUBLISHED Reserved 2026-05-24 | Published 2026-05-24 | Updated 2026-05-24 | Assigner VulDB




CRITICAL: 9.2CVSS: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
HIGH: 8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
HIGH: 8.1CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
7.6AV:N/AC:H/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR

Problem types

Improper Authorization

Incorrect Privilege Assignment

Product status

20260426
affected

Timeline

2026-05-24:Advisory disclosed
2026-05-24:VulDB entry created
2026-05-24:VulDB entry last update

Credits

carfeii (VulDB User) reporter

VulDB CNA Team coordinator

References

vuldb.com/vuln/365378 (VDB-365378 | Besen BS20 EV Charging Station OTA Update Installation improper authorization) vdb-entry

vuldb.com/vuln/365378/cti (VDB-365378 | CTI Indicators (IOB, IOC, TTP)) signature permissions-required

vuldb.com/submit/813576 (Submit #813576 | Besen EV Charging Station BS20 EV Charger Embedded Malicious Code) third-party-advisory

github.com/carfeii/besen patch

cve.org (CVE-2026-9397)

nvd.nist.gov (CVE-2026-9397)

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