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CVE-2025-34256

Advantech Wise-deviceon Server hard-coded credentials

9.8 CRITICALEPSS 0.69%
  1. Published5 Dec 2025

Description

Advantech WISE-DeviceOn Server versions prior to 5.4 contain a hard-coded cryptographic key vulnerability. The product uses a static HS512 HMAC secret for signing EIRMMToken JWTs across all installations. The server accepts forged JWTs that need only contain a valid email claim, allowing a remote unauthenticated attacker to generate arbitrary tokens and impersonate any DeviceOn account, including the root super admin. Successful exploitation permits full administrative control of the DeviceOn instance and can be leveraged to execute code on managed agents through DeviceOn’s remote management features.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Advantech Wise-deviceon Server< 5.4

Remediation

Fixed in
Advantech Wise-deviceon Server≥ 5.4

References

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Frequently asked

Is CVE-2025-34256 being actively exploited?

CVE-2025-34256 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.69%.

How severe is CVE-2025-34256?

CVE-2025-34256 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.69% probability of exploitation.

Which products are affected by CVE-2025-34256?

Affected products include Advantech Wise-deviceon Server.

How do I fix CVE-2025-34256?

Upgrade affected software to a fixed version, for example Advantech Wise-deviceon Server 5.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-34256 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.