# CVE-2026-43835: Advantech ADAM-3600 EdgeLink firmware upgrade authentication bypass

Source: https://junglewise.ai/threats/cve-2026-43835-a-vulnerability-in-the-firmware-upgrade-functionality-could-allow  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-43835 · Severity: info · Published 2026-10-20

Advantech ADAM-3600 EdgeLink is a remote terminal unit used for industrial data acquisition and monitoring in critical infrastructure. An authenticated attacker can upload a forged firmware file that permanently compromises the device, allowing complete takeover and potential disruption of industrial operations.

Technologies: [Advantech ADAM-3600 EdgeLink](https://junglewise.ai/threats/technologies/adam-3600-edgelink). Vendors: [Advantech](https://junglewise.ai/threats/vendors/advantech).

## Quick answers

**Is CVE-2026-43835 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-43835 being exploited in the wild.

**How severe is CVE-2026-43835?** Informational severity, published 20 October 2026.

**Which products and versions are affected?** Advantech ADAM-3600 EdgeLink unspecified.

**Is there a fix for CVE-2026-43835?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-43835 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-43835?** Check whether you run Advantech ADAM-3600 EdgeLink at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An authentication bypass vulnerability in the firmware upgrade functionality allows an authenticated attacker to upload a malicious firmware file without proper verification. The device lacks sufficient validation of firmware file authenticity before installation. Exploitation results in permanent device compromise with full system access.

## Affected products

- Advantech ADAM-3600 EdgeLink unspecified

## Timeline

- 2026-10-20: disclosed

## References

- [https://www.advantech.com/en/security-advisory](https://www.advantech.com/en/security-advisory)
- [https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-149](https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-149)

## Related threats

- [Advantech ADAM-3600 EdgeLink stack-based buffer overflow in login](https://junglewise.ai/threats/cve-2026-43858-a-stack-based-buffer-overflow-vulnerability-could-allow-a-remote)
- [Advantech ADAM-3600 EdgeLink arbitrary code execution via proprietary protocol](https://junglewise.ai/threats/cve-2026-43857-a-vulnerability-could-allow-a-remote-authenticated-attacker-to)
- [Advantech ADAM-3600 stack-based buffer overflow in FileProcess CheckDir](https://junglewise.ai/threats/cve-2026-43856-a-stack-based-buffer-overflow-vulnerability-in-the-fileprocess)
- [Advantech ADAM-3600 EdgeLink heap buffer overflow remote authenticated code execution](https://junglewise.ai/threats/cve-2026-43855-a-heap-based-buffer-overflow-vulnerability-could-allow-a-remote)
- [Advantech ADAM-3600 EdgeLink sensitive data exposure in project files](https://junglewise.ai/threats/cve-2026-43854-a-vulnerability-could-allow-an-attacker-with-access-to-an)