CVE-2026-13308Network attack vector

Unauthenticated RCE via OCPP WebSocket integer underflow

Published Jul 29, 2026 · Updated Jul 29, 2026

Integer underflow in Autel MaxiCharger AC Elite Home 1.39.51 allows remote attackers to execute arbitrary code through OCPP WebSockets. The OCPP WebSocket message handler fails to validate attacker-controlled length data, allowing an integer underflow before buffer allocation. Authentication is not required; successful exploitation executes code in the device context and can fully compromise the charger.

CVSS severity8.1
High
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in Autel MaxiCharger AC Elite Home 1.39.51 allows remote attackers to execute arbitrary code through OCPP WebSockets. The OCPP WebSocket message handler fails to validate attacker-controlled length data, allowing an integer underflow before buffer allocation. Authentication is not required; successful exploitation executes code in the device context and can fully compromise the charger.

The record

CVE
CVE-2026-13308
Published
Jul 29, 2026
Updated
Jul 29, 2026
Vendor
Autel
Product
MaxiCharger AC Elite Home
Classifications
CWE-191, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.39.51

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Autel · MaxiCharger AC Elite Homeversion=1.39.51

Published CVSS scores

8.1Zero Day InitiativeCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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