Vulnerability · Published Aug 26, 2025 · Assigned by CERTVDE
CVE-2025-41702egOS WebGUI Hard-Coded JWT Secret Enables Authentication Bypass
Critical 9.8
In plain English
A critical-severity security flaw in EG400Mk2-D11001-000101 from Welotec. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.5%top 55.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
The JWT secret key is embedded in the egOS WebGUI backend and is readable to the default user. An unauthenticated remote attacker can generate valid HS256 tokens and bypass authentication/authorization due to the use of hard-coded cryptographic key.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Welotec | EG400Mk2-D11001-000101 | 0.0.0 – before v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG400Mk2-D11101-000101 | 0.0.0 – before v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG503W | 0.0.0 – before v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG503L | 0.0.0 – before v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG503W_4GB | 0.0.0 – before v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG503L_4GB | 0.0.0 – before v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG503L-G | 0.0.0 – before v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG500Mk2-A11101-000101 | 0.0.0 – before v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG500Mk2-A11001-000101 | 0.0.0 – before v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG500Mk2-B11101-000101 | 0.0.0 – before <v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG500Mk2-B11001-000101 | 0.0.0 – before <v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG500Mk2-C11101-000101 | 0.0.0 – before <v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG500Mk2-C11001-000101 | 0.0.0 – before <v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG500Mk2-A12011-000101 | 0.0.0 – before <v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG500Mk2-A11001-000201 | 0.0.0 – before <v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG500Mk2-A21101-000101 | 0.0.0 – before <v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG602W | 0.0.0 – before <v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG602L | 0.0.0 – before <v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG603W Mk2 | 0.0.0 – before <v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG603L Mk2 | 0.0.0 – before <v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG802W | 0.0.0 – before <v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG804W | 0.0.0 – before <v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG802W_i7_512GB_DinRail | 0.0.0 – before <v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG802W_i7_512GB_w/o DinRail | 0.0.0 – before <v1.7.7v1.8.0 – before v1.8.2 |
| Welotec | EG804W Pro | 0.0.0 – before <v1.7.7v1.8.0 – before v1.8.2 |
Weakness: CWE-321 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H