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Vulnerability Details :

CVE-2026-9397

Summary
Assigner-VulDB
Assigner Org ID-1af790b2-7ee1-4545-860a-a788eba489b5
Published At-24 May, 2026 | 20:30
Updated At-26 May, 2026 | 14:37
Rejected At-
Credits

Besen BS20 EV Charging Station OTA Update Installation improper authorization

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."

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:VulDB
Assigner Org ID:1af790b2-7ee1-4545-860a-a788eba489b5
Published At:24 May, 2026 | 20:30
Updated At:26 May, 2026 | 14:37
Rejected At:
▼CVE Numbering Authority (CNA)
Besen BS20 EV Charging Station OTA Update Installation improper authorization

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."

Affected Products
Vendor
Besen
Product
BS20 EV Charging Station
CPEs
  • cpe:2.3:a:besen:bs20_ev_charging_station:*:*:*:*:*:*:*:*
Modules
  • OTA Update Installation Handler
Versions
Affected
  • 20260426
Problem Types
TypeCWE IDDescription
CWECWE-285Improper Authorization
CWECWE-266Incorrect Privilege Assignment
Type: CWE
CWE ID: CWE-285
Description: Improper Authorization
Type: CWE
CWE ID: CWE-266
Description: Incorrect Privilege Assignment
Metrics
VersionBase scoreBase severityVector
4.09.2CRITICAL
CVSS: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
3.18.1HIGH
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
3.08.1HIGH
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
2.07.6N/A
AV:N/AC:H/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
Version: 4.0
Base score: 9.2
Base severity: CRITICAL
Vector:
CVSS: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
Version: 3.1
Base score: 8.1
Base severity: HIGH
Vector:
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
Version: 3.0
Base score: 8.1
Base severity: HIGH
Vector:
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
Version: 2.0
Base score: 7.6
Base severity: N/A
Vector:
AV:N/AC:H/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

reporter
carfeii (VulDB User)
coordinator
VulDB CNA Team
Timeline
EventDate
Advisory disclosed2026-05-24 00:00:00
VulDB entry created2026-05-24 02:00:00
VulDB entry last update2026-05-24 08:24:17
Event: Advisory disclosed
Date: 2026-05-24 00:00:00
Event: VulDB entry created
Date: 2026-05-24 02:00:00
Event: VulDB entry last update
Date: 2026-05-24 08:24:17
Replaced By

Rejected Reason

References
HyperlinkResource
https://vuldb.com/vuln/365378
vdb-entry
https://vuldb.com/vuln/365378/cti
signature
permissions-required
https://vuldb.com/submit/813576
third-party-advisory
https://github.com/carfeii/besen#finding-4-unauthorized-firmware-installation-via-spoofed-ota-updates
patch
Hyperlink: https://vuldb.com/vuln/365378
Resource:
vdb-entry
Hyperlink: https://vuldb.com/vuln/365378/cti
Resource:
signature
permissions-required
Hyperlink: https://vuldb.com/submit/813576
Resource:
third-party-advisory
Hyperlink: https://github.com/carfeii/besen#finding-4-unauthorized-firmware-installation-via-spoofed-ota-updates
Resource:
patch
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:cna@vuldb.com
Published At:24 May, 2026 | 21:16
Updated At:24 May, 2026 | 21:16

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."

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.08.2HIGH
CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary3.18.1HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Secondary2.07.6HIGH
AV:N/AC:H/Au:N/C:C/I:C/A:C
Type: Secondary
Version: 4.0
Base score: 8.2
Base severity: HIGH
Vector:
CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Primary
Version: 3.1
Base score: 8.1
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Type: Secondary
Version: 2.0
Base score: 7.6
Base severity: HIGH
Vector:
AV:N/AC:H/Au:N/C:C/I:C/A:C
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-266Primarycna@vuldb.com
CWE-285Primarycna@vuldb.com
CWE ID: CWE-266
Type: Primary
Source: cna@vuldb.com
CWE ID: CWE-285
Type: Primary
Source: cna@vuldb.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/carfeii/besen#finding-4-unauthorized-firmware-installation-via-spoofed-ota-updatescna@vuldb.com
N/A
https://vuldb.com/submit/813576cna@vuldb.com
N/A
https://vuldb.com/vuln/365378cna@vuldb.com
N/A
https://vuldb.com/vuln/365378/cticna@vuldb.com
N/A
Hyperlink: https://github.com/carfeii/besen#finding-4-unauthorized-firmware-installation-via-spoofed-ota-updates
Source: cna@vuldb.com
Resource: N/A
Hyperlink: https://vuldb.com/submit/813576
Source: cna@vuldb.com
Resource: N/A
Hyperlink: https://vuldb.com/vuln/365378
Source: cna@vuldb.com
Resource: N/A
Hyperlink: https://vuldb.com/vuln/365378/cti
Source: cna@vuldb.com
Resource: N/A

Change History

0
Information is not available yet

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