---
id: "CVE-2026-43838"
kind: "vulnerability"
aliases: ["CVE-2026-43838"]
title: "Unnamed login component: stack overflow lets attacker run code"
severity: "critical"
cvss: 9.2
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "ADAM-3600 EdgeLink", "fixed": ["2.8.5.1"], "affected": "< 2.8.5.0", "ecosystem": "vendor"}]
ecosystems: []
tags: ["adam-3600", "advantech", "buffer-overflow", "edgelink", "ics", "ot", "other", "rtu", "unknown-product"]
not_affected_if: ["firmware-2.8.5.1-or-later", "not-exposed-to-network"]
published_at: "2026-10-20T09:17:10+00:00"
first_seen_at: "2026-10-23T21:57:20+00:00"
updated_at: "2026-10-23T23:22:23+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43838", "first_seen_at": "2026-10-23T21:57:20+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-23T23:22:23+00:00"}]
---

# Unnamed login component: stack overflow lets attacker run code

Stack-based buffer overflow in the login functionality of Advantech ADAM-3600 EdgeLink remote terminal units (industrial data acquisition). Network-reachable, no auth or user interaction needed (CVSS 4.0 9.2, AC:H). Part of Advantech advisory ACIRT-261001 covering about 30 ADAM-3600 CVEs, disclosed 2026-10-20. Found by Nozomi Networks. No known exploitation.

_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 2.8.5.1

## How to check

Check the ADAM-3600 EdgeLink firmware/software version in the device web UI or EdgeLink Studio. Anything below 2.8.5.0 is affected per the CVE record. Check whether the device's web/login service is reachable from untrusted networks.

## Fix

Update ADAM-3600 EdgeLink to the latest Advantech release (2.8.5.1 or later; the CVE record says fixed in 2.8.5.0, a sibling CVE says 2.8.5.1). If you cannot patch, remove internet and untrusted-network exposure and restrict access to the device by firewall or VPN. Advisory ACIRT-261001 on advantech.com.

## Timeline

- 2026-10-23T21:57:20+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-43838
- 2026-10-23T23:22:23+00:00 analyst — Identified as Advantech ADAM-3600 EdgeLink RTU (ACIRT-261001, batch of ~30 CVEs; CSA SG AL-2026-149; CVE record: affected prior to 2.8.5.0, sibling CVE-2026-43832 reported fixed in 2.8.5.1 by IONIX, so use 2.8.5.1 or later). No exploitation or public PoC found; not KEV; SSVC exploitation none. Advantech advisory body not readable, only index page.

## Documents

- [advisory] Advantech Security Advisories (ACIRT-261001, ADAM-3600) https://www.advantech.com/en-us/security-advisory
- [describes] CSA Singapore AL-2026-149: Advantech ADAM-3600 EdgeLink multiple vulnerabilities https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-149
- [describes] CVE Record CVE-2026-43838 https://www.cve.org/CVERecord?id=CVE-2026-43838

## From the sources

A stack-based buffer overflow vulnerability in the login functionality could allow an attacker to achieve code execution.

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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_