CVE-2025-34256

UNKNOWN 0.0

Advantech WISE-DeviceOn Server < 5.4 Hard-coded JWT Key Authentication Bypass

CVSS Score

0.0

EPSS Score

0.3%

EPSS Percentile

53th

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.

CWE	CWE-321
Vendor	advantech co., ltd.
Product	wise-deviceon server
Published	Dec 5, 2025
Last Updated	Apr 15, 2026

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Affected Versions

Advantech Co., Ltd. / WISE-DeviceOn Server

0 < 5.4.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

advcloudfiles.advantech.com: https://advcloudfiles.advantech.com/cms/2ca1b071-fd78-4d7f-8a2a-7b4537a95d19/Security%20Advisory%20PDF%20File/SECURITY-ADVISORY----DeviceOn-20251208-2.pdf pellera.com: https://pellera.com/blog/advantech-wise-deviceon-cve-2025-34256-vulnerability/ docs.deviceon.advantech.com: https://docs.deviceon.advantech.com/docs/resource/ vulncheck.com: https://www.vulncheck.com/advisories/advantech-wise-deviceon-server-hardcoded-jwt-key-authentication-bypass

Credits

Alex Williams from Pellera Technologies