Advantech ADAM-3600 EdgeLink: Authentication bypass in proprietary protocol
Summary
CVE-2026-43844 is a critical authentication bypass in the proprietary protocol of the Advantech ADAM-3600 EdgeLink remote terminal unit, which is used for industrial data acquisition and remote monitoring. According to the CVSS 4.0 vector, an unauthenticated attacker on the network can bypass authentication without user interaction, with high impact on confidentiality, integrity and availability. No exploitation in the wild or public proof-of-concept has been confirmed.
Affected
- Advantech ADAM-3600 EdgeLink prior to version 2.8.5.0
- Default configuration: unaffected (according to the CVE record)
Fixed in
- Update to version 2.8.5.0 or later (Advantech security update, released October 15, 2026)
- Exact fixed build to be confirmed against Advantech advisory ACIRT-261001, as some sources cite 2.8.5.1
Workaround
- No specific workaround documented for this CVE.
- General hardening: keep the device off the internet, place it behind firewalls and restrict access to the proprietary protocol and web interface to trusted hosts.
Exploitation
- CISA SSVC: exploitation none, automatable yes, technical impact total.
- Not listed in CISA KEV.
- VulDB: no exploit exists.
- No confirmed exploitation in the wild or public PoC known.
Our recommendation
- Inventory all ADAM-3600 / EdgeLink devices and their firmware versions.
- Check whether any device is reachable from the internet or from a flat OT/IT network, and restrict access.
- Schedule an update to the fixed firmware after verifying the exact build in Advantech's advisory.
- Patch the whole EdgeLink advisory batch, not only this CVE.
- Monitor for proof-of-concept releases and CISA KEV additions.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- CSA Singapore alert AL-2026-149 www.csa.gov.sg
- Advantech Security Advisories www.advantech.com
- Advantech ADAM-3600 advisory PDF advcloudfiles.advantech.com
- OpenCVE CVE-2026-43844 app.opencve.io
- VulDB CVE-2026-43844 vuldb.com
- VulDB entry 422712 vuldb.com
- ThreatInt CVE-2026-43844 cve.threatint.com
- SecurityOnline ADAM-3600 vulnerabilities securityonline.info
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 31 Oct 2026, 01:06.
Original description (NVD)
A vulnerability in the proprietary protocol could allow an attacker to bypass the authentication mechanism.
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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