---
id: "CVE-2026-43858"
kind: "vulnerability"
aliases: ["CVE-2026-43858"]
title: "Stack buffer overflow lets an authenticated remote user run code"
severity: "high"
cvss: 8.6
epss: null
exploited: false
status: "resolved"
category: "other"
products: [{"name": "ADAM-3600", "fixed": ["2.8.5.0"], "affected": "< 2.8.5.0", "ecosystem": "vendor"}]
ecosystems: []
tags: ["adam-3600", "advantech", "edgelink", "firmware", "ics", "other", "rce"]
not_affected_if: ["auth-required"]
published_at: "2026-10-20T10:17:06+00:00"
first_seen_at: "2026-10-23T21:57:20+00:00"
updated_at: "2026-10-24T00:14:52+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43858", "first_seen_at": "2026-10-23T21:57:20+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-24T00:14:52+00:00"}]
---

# Stack buffer overflow lets an authenticated remote user run code

Stack-based buffer overflow in Advantech ADAM-3600 EdgeLink industrial RTU firmware before 2.8.5.0. A remote attacker with high-privilege credentials can run arbitrary code. Part of a batch of about 30 ADAM-3600 CVEs disclosed 2026-10-20 (found by Nozomi Networks). Vendor patched 2026-10-15. No known exploitation.

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

## Affected

- vendor:ADAM-3600 affected < 2.8.5.0 fixed 2.8.5.0

## How to check

Check the ADAM-3600 firmware version in the device web UI or EdgeLink tooling. Anything below 2.8.5.0 is affected. Find exposed devices by checking whether the management interface is reachable from untrusted networks.

## Fix

Update ADAM-3600 firmware to 2.8.5.0 or later (see https://www.advantech.com/en/security-advisory). Do not expose the management interface to the internet, and restrict admin credentials.

## Timeline

- 2026-10-23T21:57:20+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-43858
- 2026-10-24T00:14:52+00:00 analyst — Product identified as Advantech ADAM-3600 EdgeLink RTU, affected < 2.8.5.0 (NVD/CVE record), one of ~30 CVEs in CSA AL-2026-149 (vendor patched 2026-10-15). Advantech advisory page is generic; exact fixed build number and per-CVE detail not read, so fixed is inferred as 2.8.5.0. No exploitation or PoC found; CISA SSVC exploitation none. Social search skipped (no CVE-specific chatter expected).

## Documents

- [advisory] CSA Singapore AL-2026-149: Advantech ADAM-3600 EdgeLink multiple vulnerabilities https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-149/
- [describes] NVD record CVE-2026-43858 (Advantech ADAM-3600 < 2.8.5.0) https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-43858

## From the sources

A stack-based buffer overflow vulnerability could allow a remote authenticated attacker to achieve arbitrary 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_