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CVE-2026-43829 – Unauthenticated Remote Code Execution (Stack-Based Buffer Overflow) – Advantech ADA

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Summary

CVE-2026-43829 is a stack-based buffer overflow (CWE-121) in the Advantech ADAM-3600 EdgeLink remote terminal unit. An unauthenticated, network-based attacker can exploit the flaw in the product’s password functionality to achieve code execution when the SafeEnhancement feature is enabled. The issue affects EdgeLink versions prior to 2.8.5.1 and carries a CVSS v3.1 base score of 7.5 (HIGH).

Technical details

  • Root cause: A stack-based buffer overflow (CWE-121) in the password functionality of the ADAM-3600 EdgeLink.
  • Trigger conditions: Exploitable when the SafeEnhancement feature is enabled; no authentication or user interaction is required.
  • Attack vector: Network (remotely reachable service).
  • Impact: Successful exploitation could allow an unauthenticated attacker to conduct code execution on the affected device.

Affected software

  • Advantech ADAM-3600 EdgeLink — all versions prior to 2.8.5.1.

Severity

  • CVSS v3.1 Base Score: 7.5 (HIGH)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: Update the ADAM-3600 EdgeLink to version 2.8.5.1 or later, as released by Advantech.
  • If no patch can be applied: Minimize network exposure of the device, ensuring it is not directly reachable from the internet. Place control-system devices behind firewalls and isolate them from business networks; when remote access is required, use secure methods such as a VPN. Where operationally feasible, review whether the SafeEnhancement feature must remain enabled, since exploitation is described as requiring it.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Page title: EdgeLink
  • Favicon fingerprint: 1086851975

References

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Map your entire attack surface (continously)

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Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

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6

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Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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