CVE-2025-34256
Severity CVSS v4.0:
CRITICAL
Type:
CWE-321
Use of Hard-coded Cryptographic Key
Publication date:
05/12/2025
Last modified:
05/12/2025
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.
Impact
Base Score 4.0
10.00
Severity 4.0
CRITICAL
References to Advisories, Solutions, and Tools
- https://advcloudfiles.advantech.com/cms/2ca1b071-fd78-4d7f-8a2a-7b4537a95d19/Security%20Advisory%20PDF%20File/SECURITY-ADVISORY----DeviceOn.pdf
- https://docs.deviceon.advantech.com/docs/resource/
- https://www.vulncheck.com/advisories/advantech-wise-deviceon-server-hardcoded-jwt-key-authentication-bypass