---
id: CVE-2026-43840
title: >-
  A NULL pointer dereference vulnerability in the license manager service could
  allow an unauthenticated attacker to crash the service via the on_disconnected
  callback function.
summary: >-
  A NULL pointer dereference vulnerability in the license manager service could
  allow an unauthenticated attacker to crash the service via the on_disconnected
  callback function.
severity: medium
cvss: 6.9
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'
cvssSource: cna
vendor: Advantech
product: ADAM-3600
affected:
  - ADAM-3600 prior to version 2.8.5.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-20T15:15:51.446797Z'
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T18:08:00.900Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43840'
references:
  - url: 'https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-149'
  - url: 'https://www.advantech.com/en/security-advisory'
tags:
  - cve.org
epss: 0.00344
epssPercentile: 0.27724
ingestedAt: '2026-10-20T12:05:07.356Z'
---

## Overview

A NULL pointer dereference vulnerability in the license manager service could allow an unauthenticated attacker to crash the service via the on_disconnected callback function.

## Affected

- `ADAM-3600 prior to version 2.8.5.0`

## Remediation

Advantech has released a security update to address these vulnerabilities. Users and administrators of affected product versions are advised to update to the latest version immediately.