Vulnerability 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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Advantech | Wise-Deviceon Server | < 5.4 |
Related Weaknesses (CWE)
References
- https://advcloudfiles.advantech.com/cms/2ca1b071-fd78-4d7f-8a2a-7b4537a95d19/Sec
- https://docs.deviceon.advantech.com/docs/resource/Product
- https://pellera.com/blog/advantech-wise-deviceon-cve-2025-34256-vulnerability/
- https://www.vulncheck.com/advisories/advantech-wise-deviceon-server-hardcoded-jwThird Party Advisory
FAQ
What is CVE-2025-34256?
CVE-2025-34256 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 installati...
How severe is CVE-2025-34256?
CVE-2025-34256 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2025-34256?
Check the references section above for vendor advisories and patch information. Affected products include: Advantech Wise-Deviceon Server.