How do I check whether I am affected by CVE-2026-43837?

Check the EdgeLink firmware version on each ADAM-3600 (device web UI / system info). Anything below 2.8.5.0 is affected. Also check whether guest accounts are enabled and whether the device is reachable from untrusted networks.

What is the fix for CVE-2026-43837?

Update ADAM-3600 EdgeLink firmware to 2.8.5.0 or later (Advantech released 2026-10-15; some Advantech text refers to 2.8.5.1, so prefer the newest build from the Advantech ACIRT-261001 advisory). Until then: disable guest accounts, keep RTUs off the internet, and firewall them.

Who is not affected by CVE-2026-43837?

Not affected if: firmware-2.8.5.0-or-later, no-guest-account, not-network-reachable.

Live › vulnerability › CVE-2026-43837

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high7.5Other

Password verification buffer overflow lets guest-authenticated attacker run code

Buffer overflow in the password verification function of Advantech ADAM-3600 EdgeLink (industrial remote terminal unit) firmware before 2.8.5.0. An attacker with a guest login can reach it over the network and achieve code execution. Part of a batch of 30 ADAM-3600 CVEs fixed together. No exploitation reported.

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

CVSS 4.0

7.5

high

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

known so far5 of 6

missing: exploitation

First public: Oct 20, 2026 UTC
Last modified: Oct 25, 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 high, and not just CVSS

Likelihood → · Impact ↓

critical

high

medium

high

medium

low

medium

low

Exploited: No reports yet.
Needs login: Yes.
Needs a special setup: Not known from the sources.
Reachable from: Not known from the sources.
Worst case: Attacker with guest login runs code on the affected system.
CVSS said: 7.5. The facts above say medium; we keep the sources' high until an analyst looks.

Who is affected

1 product

Know the next one before it finds you.

Add to Slack

Live › vulnerability › CVE-2026-43837

Go to dashboard

high7.5Other

Password verification buffer overflow lets guest-authenticated attacker run code

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

CVSS 4.0

7.5

high

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

known so far5 of 6

missing: exploitation

First public: Oct 20, 2026 UTC
Last modified: Oct 25, 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 high, and not just CVSS

Likelihood → · Impact ↓

critical

high

medium

high

medium

low

medium

low

Exploited: No reports yet.
Needs login: Yes.
Needs a special setup: Not known from the sources.
Reachable from: Not known from the sources.
Worst case: Attacker with guest login runs code on the affected system.
CVSS said: 7.5. The facts above say medium; we keep the sources' high until an analyst looks.

Who is affected

1 product

Know the next one before it finds you.

Add to Slack

Password verification buffer overflow lets guest-authenticated attacker run code

Why it is high, and not just CVSS

Who is affected

Know the next one before it finds you.

Password verification buffer overflow lets guest-authenticated attacker run code

Why it is high, 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