CVE-2026-9398 (GCVE-0-2026-9398)

Vulnerability from cvelistv5 – Published: 2026-05-24 20:45 – Updated: 2026-05-24 20:45
VLAI
Title
Besen BS20 EV Charging Station BLE/WiFi authentication replay
Summary
A security vulnerability has been detected in Besen BS20 EV Charging Station up to 20260426. This affects an unknown part of the component BLE/WiFi. Such manipulation leads to authentication bypass by capture-replay. The attack must be carried out from within the local network. Attacks of this nature are highly complex. It is indicated that the exploitability is 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."
Severity
2.3 (Low)
CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
3.1 (Low)
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
3.1 (Low)
CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
CWE
  • CWE-294 - Authentication Bypass by Capture-replay
  • CWE-287 - Improper Authentication
Assigner
References
Impacted products
Vendor Product Version
Besen BS20 EV Charging Station Affected: 20260426
    cpe:2.3:a:besen:bs20_ev_charging_station:*:*:*:*:*:*:*:*
 Create a notification for this product.
Credits
carfeii (VulDB User) VulDB CNA Team
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:besen:bs20_ev_charging_station:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "BLE/WiFi"
          ],
          "product": "BS20 EV Charging Station",
          "vendor": "Besen",
          "versions": [
            {
              "status": "affected",
              "version": "20260426"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "carfeii (VulDB User)"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "VulDB CNA Team"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A security vulnerability has been detected in Besen BS20 EV Charging Station up to 20260426. This affects an unknown part of the component BLE/WiFi. Such manipulation leads to authentication bypass by capture-replay. The attack must be carried out from within the local network. Attacks of this nature are highly complex. It is indicated that the exploitability is 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.\""
        }
      ],
      "metrics": [
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            "baseSeverity": "LOW",
            "vectorString": "CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P",
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      "problemTypes": [
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        },
        {
          "descriptions": [
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              "description": "Improper Authentication",
              "lang": "en",
              "type": "CWE"
            }
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-24T20:45:08.425Z",
        "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "shortName": "VulDB"
      },
      "references": [
        {
          "name": "VDB-365379 | Besen BS20 EV Charging Station BLE/WiFi authentication replay",
          "tags": [
            "vdb-entry"
          ],
          "url": "https://vuldb.com/vuln/365379"
        },
        {
          "name": "VDB-365379 | CTI Indicators (IOB, IOC, TTP)",
          "tags": [
            "signature",
            "permissions-required"
          ],
          "url": "https://vuldb.com/vuln/365379/cti"
        },
        {
          "name": "Submit #813577 | Besen EV Charging Station BS20 EV Charger Improper Authorization",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/submit/813577"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://github.com/carfeii/besen#finding-5-unauthorized-tampering-of-charger-commands"
        }
      ],
      "timeline": [
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          "lang": "en",
          "time": "2026-05-24T00:00:00.000Z",
          "value": "Advisory disclosed"
        },
        {
          "lang": "en",
          "time": "2026-05-24T02:00:00.000Z",
          "value": "VulDB entry created"
        },
        {
          "lang": "en",
          "time": "2026-05-24T08:24:19.000Z",
          "value": "VulDB entry last update"
        }
      ],
      "title": "Besen BS20 EV Charging Station BLE/WiFi authentication replay"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
    "assignerShortName": "VulDB",
    "cveId": "CVE-2026-9398",
    "datePublished": "2026-05-24T20:45:08.425Z",
    "dateReserved": "2026-05-24T06:19:03.634Z",
    "dateUpdated": "2026-05-24T20:45:08.425Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-9398",
      "date": "2026-05-27",
      "epss": "0.00035",
      "percentile": "0.10642"
    },
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.