CVE-2025-34256 | Advantech WISE-DeviceOn Server versions prior to 5.4 contain… | CVSS 10.0 CRITICAL

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.

Metadata

CVE ID: CVE-2025-34256
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2025-04-15 19:15 UTC
Published: 2025-12-05 17:18 UTC
Last updated: 2026-04-15 19:36 UTC
Primary CWE: CWE-321
CWE-321 Use of Hard-coded Cryptographic Key
Vendor / Product: Advantech Co., Ltd. / WISE-DeviceOn Server
Sources: cve.org · NVD

Severity & Metrics

10.0 CRITICAL CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
Advantech Co., Ltd.	WISE-DeviceOn Server	—	0 < 5.4.0

Weakness (CWE)

CWE	Source	Description
CWE-321	cna	CWE-321 Use of Hard-coded Cryptographic Key

CVSS scores (1)

Score	Severity	Version	Source	Vector
10.0	CRITICAL	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

References (4)