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Maxicharger Ac Elite Business C50 FirmwareOperating system · Autel

CVE-2024-7795

HIGH · 8.8 CVSS v3.1 Published 2024-08-21
Fix available
A fix is available. Upgrade to 1.36.00 or later.
See remediation →
93/100
Remediation priority · Urgent
No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Autel MaxiCharger AC Elite Business C50 AppAuthenExchangeRandomNum Stack-Based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Autel MaxiCharger AC Elite Business C50 EV chargers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of the AppAuthenExchangeRandomNum BLE command. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the device. Was ZDI-CAN-23384.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

A stack-based buffer overflow in the AppAuthenExchangeRandomNum BLE command handler of Autel MaxiCharger AC Elite Business C50 EV chargers allows remote attackers to execute arbitrary code by sending specially crafted BLE packets with oversized data that overflows a fixed-length stack buffer due to missing length validation.

MitigationApply vendor firmware update when available and restrict BLE/network access to the charger using network segmentation and access controls to limit exposure to adjacent attackers.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Maxicharger Ac Elite Business C50 FirmwareOperating system
Affected:< 1.36.00

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Verify device model
    Identify the exact model number of the Autel charger. Check the physical device label, management interface, or API endpoint that returns device information. Confirm it is an Autel MaxiCharger AC Elite Business C50 variant.
    Affected if The device is NOT an Autel MaxiCharger AC Elite Business C50.
  2. Check installed firmware version
    Access the charger admin interface or use the vendor's diagnostic tool or API to query the current firmware version. Compare the installed version against the vulnerable range: firmware versions prior to 1.36.00.
    Affected if Installed firmware version is less than 1.36.00.
  3. Confirm BLE is enabled
    Check the charger configuration settings via its web interface, mobile app, or management API to determine if Bluetooth Low Energy (BLE) communication is currently enabled.
    Affected if BLE is enabled and accessible.
  4. Assess BLE attack surface
    Determine whether the charger is accessible to unauthorized BLE clients. Check if BLE communication is restricted by authentication requirements, network segmentation, or physical access controls. Attempt to observe BLE advertising packets from the device if within range.
    Affected if BLE is enabled and the device is within BLE range of untrusted attackers.

A user is affected if they have an Autel MaxiCharger AC Elite Business C50 with firmware below version 1.36.00, with BLE enabled and accessible to adjacent attackers.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 1.36.00 or later
Fixed in 1.36.00
Interim mitigation

Apply vendor firmware update when available and restrict BLE/network access to the charger using network segmentation and access controls to limit exposure to adjacent attackers.

Recommended fix High confidence

Firmware version 1.36.00 or later

  1. 1. Identify the current firmware version of the MaxiCharger AC Elite Business C50 device through its admin interface or mobile app
  2. 2. Navigate to the official Autel Energy support website or authorized download portal to obtain firmware version 1.36.00 or later
  3. 3. Download the firmware update file for the MaxiCharger AC Elite Business C50
  4. 4. Access the device's administrative web interface or use the official mobile app to initiate the firmware update process
  5. 5. Upload the downloaded firmware file and confirm the update
  6. 6. Allow the update to complete and verify the device restarts successfully
  7. 7. Confirm the installed firmware version is 1.36.00 or later through the admin interface
Caveat Review Autel release notes for any configuration or feature changes between your current version and 1.36.00

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Maxicharger Ac Elite Business C50 Firmware Scoped from the published advisory
  • Consultation3.0 h
  • Implementation2.0 h
  • Testing6.0 h
  • Review / QA3.0 h
14.0 hours of engineering $2,400
Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-7795 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data