CVE-2026-9397 json
Besen BS20 EV Charging Station OTA Update Installation improper authorization
published 2026-05-24 5 mo ago modified 2026-07-23 3 mo ago also EUVD-2026-31551
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 39%
- public exploits
- 0
- none known
Summary
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."
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 5 mo ago
Exploit prediction
0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.2 | 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 |
| CNA | 3.1 | 8.1 | 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 |
| CNA | 3.0 | 8.1 | 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 |
| CNA | 2.0 | 7.6 | AV:N/AC:H/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR |
| CNA | 4.0 | 8.2 | 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 |
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 2.0 | 7.6 | AV:N/AC:H/Au:N/C:C/I:C/A:C |
Affected products
- Besen BS20 EV Charging Station
Classification
References
-
github.com
/carfeii/besen#finding-4-unauthorized-firmware-installation-via-spoofed-ota-updates
patch
-
vuldb.com
/vuln/365378
vdb-entry
-
vuldb.com
/vuln/365378/cti
signature, permissions-required
-
vuldb.com
/submit/813576
third-party-advisory
Sources
- CVE List CVE-2026-9397
- NVD CVE-2026-9397
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