# CVE-2026-43858: Advantech ADAM-3600 EdgeLink stack-based buffer overflow in login

Source: https://junglewise.ai/threats/cve-2026-43858-a-stack-based-buffer-overflow-vulnerability-could-allow-a-remote  
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-2026-43858 · Severity: info · Published 2026-10-20

Advantech ADAM-3600 EdgeLink is a remote terminal unit used in industrial data acquisition and remote monitoring systems. CVE-2026-43858 is one of multiple stack-based buffer overflow vulnerabilities in this product that allows an attacker with authentication to execute arbitrary code, potentially gaining full control of critical industrial infrastructure.

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-2026-43858 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-43858 being exploited in the wild.

**How severe is CVE-2026-43858?** Informational severity, published 20 October 2026.

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

**Is there a fix for CVE-2026-43858?** 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-2026-43858 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-43858?** Check whether you run Advantech ADAM-3600 EdgeLink. 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

CVE-2026-43858 is a stack-based buffer overflow in the login functionality (CVSS 8.6) that requires authentication to exploit. The vulnerability allows a remote authenticated attacker to conduct arbitrary code execution. Related critical vulnerabilities in the same product include unauthenticated buffer overflows in password, log message, and cookie parsing functionality when SafeEnhancement is enabled.

## Affected products

- Advantech ADAM-3600 EdgeLink

## 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 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)
- [Advantech ADAM-3600 EdgeLink denial of service via assertion fault](https://junglewise.ai/threats/cve-2026-43853-a-vulnerability-could-allow-an-attacker-to-send-a-crafted-message)