Advantech ADAM-3600 EdgeLink: Stack-based buffer overflow in FileProcess::CheckDir
Summary
A stack-based buffer overflow in the FileProcess::CheckDir function of Advantech ADAM-3600 EdgeLink remote terminal units allows a remote authenticated attacker to execute arbitrary code. The attack is possible with a path longer than 1024 bytes. CVSS 4.0 rates the issue at 8.6 (High), and the CNA's vector requires high privileges.
Affected
- Advantech ADAM-3600 EdgeLink prior to version 2.8.5.0
- Default configuration: unaffected
Fixed in
- Version 2.8.5.0 (security update released by Advantech)
Workaround
- No vendor workaround known for this CVE.
- Until patched, restrict access to the management interface to a limited set of trusted hosts.
- Do not expose the device to the internet.
Exploitation
- CISA SSVC: Exploitation none, Automatable no, Technical Impact total.
- Not listed in CISA KEV.
- No public proof of concept or in-the-wild exploitation known. This is based on limited searches.
Our recommendation
- Check whether ADAM-3600 EdgeLink devices are in use and whether they are reachable from outside the local OT network.
- Update to version 2.8.5.0 or later during the next maintenance window; if the device is internet-exposed, treat this as urgent.
- Patching also addresses the other CVEs in the same Advantech advisory batch.
- Monitor the device for unexpected logins, crashes and configuration changes.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- CSA Alert AL-2026-149 www.csa.gov.sg
- Advantech Security Advisories www.advantech.com
- Advantech ADAM-3600 Security Advisory PDF advcloudfiles.advantech.com
- CISA ICS Advisory ICSA-10-337-01 www.cisa.gov
- VulDB CVE-2026-43856 vuldb.com
- OpenCVE CVE-2026-43856 app.opencve.io
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 07:40.
Original description (NVD)
A stack-based buffer overflow vulnerability in the FileProcess::CheckDir function could allow a remote authenticated attacker to achieve arbitrary code execution via a path longer than 1024 bytes.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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