How do I check whether I am affected by CVE-2026-43838?

Check the ADAM-3600 EdgeLink firmware/software version in the device web UI or EdgeLink Studio. Anything below 2.8.5.0 is affected per the CVE record. Check whether the device's web/login service is reachable from untrusted networks.

What is the fix for CVE-2026-43838?

Update ADAM-3600 EdgeLink to the latest Advantech release (2.8.5.1 or later; the CVE record says fixed in 2.8.5.0, a sibling CVE says 2.8.5.1). If you cannot patch, remove internet and untrusted-network exposure and restrict access to the device by firewall or VPN. Advisory ACIRT-261001 on advantech.com.

Who is not affected by CVE-2026-43838?

Not affected if: firmware-2.8.5.1-or-later, not-exposed-to-network.

Live › vulnerability › CVE-2026-43838

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critical9.2Other

Unnamed login component: stack overflow lets attacker run code

Stack-based buffer overflow in the login functionality of Advantech ADAM-3600 EdgeLink remote terminal units (industrial data acquisition). Network-reachable, no auth or user interaction needed (CVSS 4.0 9.2, AC:H). Part of Advantech advisory ACIRT-261001 covering about 30 ADAM-3600 CVEs, disclosed 2026-10-20. Found by Nozomi Networks. No known exploitation.

Summary written from the sources below. Check the originals before acting.

CVSS 4.0

9.2

critical

scored by 5f57b9bf-260d-4433-bf07-b6a79e9bb7d4

known so far5 of 6

missing: exploitation

First public: Oct 20, 2026 UTC
Last modified: Oct 23, 2026
Status: open
Known exploitation: None reported
Public exploit: None on GitHub
EPSS: not scored

First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.

Why it is critical, and not just CVSS

Likelihood → · Impact ↓

critical

high

medium

high

medium

low

medium

low

Exploited: No reports yet.
Needs login: Not known from the sources.
Needs a special setup: Not known from the sources.
Reachable from: Not known from the sources.
Worst case: Attacker runs code with the privileges of the vulnerable service.
CVSS said: 9.2. The facts above say medium; we keep the sources' critical until an analyst looks.

Who is affected

1 product

Know the next one before it finds you.

Add to Slack

Live › vulnerability › CVE-2026-43838

Go to dashboard

critical9.2Other

Unnamed login component: stack overflow lets attacker run code

Summary written from the sources below. Check the originals before acting.

CVSS 4.0

9.2

critical

scored by 5f57b9bf-260d-4433-bf07-b6a79e9bb7d4

known so far5 of 6

missing: exploitation

First public: Oct 20, 2026 UTC
Last modified: Oct 23, 2026
Status: open
Known exploitation: None reported
Public exploit: None on GitHub
EPSS: not scored

First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.

Why it is critical, and not just CVSS

Likelihood → · Impact ↓

critical

high

medium

high

medium

low

medium

low

Exploited: No reports yet.
Needs login: Not known from the sources.
Needs a special setup: Not known from the sources.
Reachable from: Not known from the sources.
Worst case: Attacker runs code with the privileges of the vulnerable service.
CVSS said: 9.2. The facts above say medium; we keep the sources' critical until an analyst looks.

Who is affected

1 product

Know the next one before it finds you.

Add to Slack

Unnamed login component: stack overflow lets attacker run code

Why it is critical, and not just CVSS

Who is affected

Know the next one before it finds you.

Unnamed login component: stack overflow lets attacker run code

Why it is critical, and not just CVSS

Who is affected

Know the next one before it finds you.

How to check

The fix

Who had it, and when

What the sources say, verbatim

Sources