Critical Buffer Overflow in Advantech ADAM-3600 Login Could Allow Code Execution
A stack-based buffer overflow in the login feature of older Advantech ADAM-3600 units poses a critical risk of code execution for unpatched systems.
Key points
- CVE-2026-43838 is rated critical with a CVSS score of 9.2.
- The flaw is a stack-based buffer overflow in the login functionality.
- Advantech ADAM-3600 versions prior to 2.8.5.0 are affected.
A critical vulnerability has been identified in the login functionality of Advantech ADAM-3600 devices, potentially allowing attackers to execute arbitrary code. The issue, tracked as CVE-2026-43838, stems from a stack-based buffer overflow that could be exploited by an attacker to gain control over the system.
At a glance
- CVE
- CVE-2026-43838
- Product
- Advantech ADAM-3600
- CVSS
- 9.2 Critical
- Weakness
- —
- Exploited
- No known exploitation
According to the National Vulnerability Database record, the flaw carries a CVSS score of 9.2, placing it in the critical severity category. This high score reflects the significant impact of the vulnerability, which involves the compromise of system integrity and confidentiality through unauthorized code execution.
Technical Context
The vulnerability is specifically described as a stack-based buffer overflow. This type of defect occurs when a program writes more data to a temporary storage area, or buffer, than it can hold, potentially overwriting adjacent memory. In this instance, the overflow happens within the login functionality of the device.
Exploitation of this flaw could allow an attacker to achieve code execution on the affected system. The source material does not specify whether the attack requires network access or local interaction, but the high severity rating indicates a serious potential for compromise. No mitigating factors are detailed in the provided record.
Affected Systems
The vulnerability affects Advantech ADAM-3600 devices running software versions prior to 2.8.5.0. Organizations using these industrial automation modules should verify their current firmware versions to determine if they are exposed to this risk. Any version earlier than 2.8.5.0 is considered vulnerable according to the advisory.
The source material identifies version 2.8.5.0 as the threshold for affected versions, implying that this version or later is not vulnerable. However, no explicit statement confirms that a patch has been released or that this version specifically fixes the issue. Users should consult vendor documentation for confirmation.
What should you do?
Organizations should immediately inventory their Advantech ADAM-3600 devices to check for vulnerable firmware versions. If any units are running software prior to version 2.8.5.0, they should be evaluated for potential exposure. Network segmentation can also help limit the impact of a potential breach.
What to do and how to stay safe: Advantech
- Verify the firmware version on all Advantech ADAM-3600 devices to ensure they are not running a version prior to 2.8.5.0.
- Consult vendor documentation to confirm if version 2.8.5.0 or later addresses the vulnerability.
- Monitor network traffic for unusual activity originating from or targeting these industrial modules.
- Implement strict access controls and network segmentation to limit exposure of critical infrastructure components.
Step-by-step guide: Risk-Based Vulnerability Management: Prioritize Fixes by Actual Danger
General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is the CVSS score for CVE-2026-43838?
The CVSS score for CVE-2026-43838 is 9.2, which is classified as critical.
Which versions of Advantech ADAM-3600 are vulnerable?
All versions of the Advantech ADAM-3600 prior to version 2.8.5.0 are affected by this vulnerability.
What type of vulnerability is CVE-2026-43838?
It is a stack-based buffer overflow located in the login functionality of the device.
