CVE-2025-34256 (GCVE-0-2025-34256)

Vulnerability from cvelistv5 – Published: 2025-12-05 17:18 – Updated: 2026-08-14 16:49
VLAI
Title
Advantech WISE-DeviceOn Server < 5.4 Hard-coded JWT Key Authentication Bypass
Summary
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.
Severity
10 (Critical)
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
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-15 19:36 UTC
CWE
  • CWE-321 - Use of Hard-coded Cryptographic Key
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 8194 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Advantech Co., Ltd. WISE-DeviceOn Server Affected: 0 , < 5.4.0 (semver)
    cpe:2.3:a:advantech:wise-deviceon_server:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Alex Williams from Pellera Technologies
Show details on NVD website
To clipboard 

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.