---
id: "CVE-2026-43836"
kind: "vulnerability"
aliases: ["CVE-2026-43836"]
title: "Forged network packet can run arbitrary commands with maximum privileges"
severity: "critical"
cvss: 9.3
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "ADAM-3600 EdgeLink", "fixed": ["2.8.5.0"], "affected": "< 2.8.5.0", "ecosystem": "vendor"}]
ecosystems: []
tags: ["adam-3600", "advantech", "edgelink", "ics", "network", "ot", "other", "rce", "rtu", "unauthenticated", "unknown"]
not_affected_if: ["firmware-2.8.5.0-or-later", "not-internet-exposed"]
published_at: "2026-10-20T09:17:09+00:00"
first_seen_at: "2026-10-23T21:57:20+00:00"
updated_at: "2026-10-23T23:23:34+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43836", "first_seen_at": "2026-10-23T21:57:20+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-23T23:23:34+00:00"}]
---

# Forged network packet can run arbitrary commands with maximum privileges

Advantech ADAM-3600 EdgeLink (industrial remote terminal unit) has an unauthenticated network flaw. A forged packet makes the device run arbitrary commands with maximum privileges (CVSS 4.0 9.3). It is one of 30 flaws (CVE-2026-43829 to 43858) fixed in EdgeLink 2.8.5.0. The vendor's fix adds content-length and IP-address format validation and replaces the system() call with fork plus execv, which points to command injection. No exploitation reported.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:ADAM-3600 EdgeLink affected < 2.8.5.0 fixed 2.8.5.0

## How to check

Check the EdgeLink firmware version on each ADAM-3600 in its web UI or Advantech's device tooling. Anything below 2.8.5.0 is affected. Also check whether the device's proprietary-protocol and web ports are reachable from untrusted networks or the internet.

## Fix

Update ADAM-3600 EdgeLink to 2.8.5.0 or later (the vendor says to do this as soon as possible). Until then, keep the device off the internet, put it behind a firewall, and limit access to the proprietary protocol and web interface to trusted hosts. Confirm the exact fixed build on Advantech's firmware page.

## Timeline

- 2026-10-23T21:57:20+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-43836
- 2026-10-23T23:23:34+00:00 analyst — Identified as Advantech ADAM-3600 EdgeLink (ACIRT-261001, item 8, NN-2025-0132; found by Nozomi Networks). Affected: all versions before 2.8.5.0 per CVE record and Canadian Cyber Centre. Vendor says fixed 2026-10-15. No exploitation or public PoC found (not in KEV, EPSS under 1%). Not checked: X/Bluesky chatter, since no CVE-specific posts surfaced in search. Open question: the Advantech download page lists 2.8.5.0 as Beta and the PDF mentions 2.8.5.1 for other items, so confirm the exact fixed build with Advantech.

## Documents

- [advisory] Advantech: Vulnerabilities Identified in ADAM-3600 (ACIRT-261001) https://advcloudfiles.advantech.com/cms/de8e2d94-10ab-470e-ac6f-d2e5434f4ec4/Security%20Advisory%20PDF%20File/SECURITY-ADVISORY----ADAM-3600.pdf
- [advisory] CSA Singapore AL-2026-149: Advantech ADAM-3600 EdgeLink multiple vulnerabilities https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-149/
- [advisory] CVE Record CVE-2026-43836 (affected: prior to 2.8.5.0; credit Nozomi Networks) https://www.cve.org/CVERecord?id=CVE-2026-43836
- [describes] Canadian Cyber Centre AV26-1065: Advantech ADAM-3600 prior to v2.8.5.0 https://www.cyber.gc.ca/en/alerts-advisories/control-systems-advantech-security-advisory-av26-1065
- [fix] ADAM-3600-C2G EdgeLink Image downloads (2.8.5.0 listed as Beta) https://www.advantech.com/en-us/support/details/firmware?id=1-1R5NNRV

## From the sources

A vulnerability could allow an attacker to forge a packet to execute arbitrary commands with maximum privileges.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_