Answer in brief
CVE-2025-34256 records a Unknown severity vulnerability in Advantech WISE-DeviceOn Server < 5.4 Hard-coded JWT Key Authentication Bypass. The current sources do not mark it as known exploited. The current feed maps Advantech Co., Ltd./WISE-DeviceOn Server (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Advantech Co., Ltd./WISE-DeviceOn Server (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Advantech Co., Ltd./WISE-DeviceOn Servergeneric | >=0 <5.4.0 | 5.4.0 |
Published upstream
Dec 5, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 14, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2025-34256 records a Unknown severity vulnerability in Advantech WISE-DeviceOn Server < 5.4 Hard-coded JWT Key Authentication Bypass. The current sources do not mark it as known exploited. The current feed maps Advantech Co., Ltd./WISE-DeviceOn Server (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Advantech Co., Ltd./WISE-DeviceOn Server (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Advantech Co., Ltd./WISE-DeviceOn Servergeneric | >=0 <5.4.0 | 5.4.0 |
Published upstream
Dec 5, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 14, 2026
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.
Quoted source text, attributed separately from HOL analysis.