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Fencer Intel
critical 9.8

CVE-2025-41702 json

egOS WebGUI Hard-Coded JWT Secret Enables Authentication Bypass

published last yr. modified 4mo ago also EUVD-2025-25832

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

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.

Patch / fix

  • Welotec EG400Mk2-D11001-000101 v1.7.7, v1.8.2
  • Welotec EG400Mk2-D11101-000101 v1.7.7, v1.8.2
  • Welotec EG503W v1.7.7, v1.8.2
  • Welotec EG503L v1.7.7, v1.8.2
  • Welotec EG503W_4GB v1.7.7, v1.8.2
  • Welotec EG503L_4GB v1.7.7, v1.8.2
  • Welotec EG503L-G v1.7.7, v1.8.2
  • Welotec EG500Mk2-A11101-000101 v1.7.7, v1.8.2
  • Welotec EG500Mk2-A11001-000101 v1.7.7, v1.8.2
  • Welotec EG500Mk2-B11101-000101 <v1.7.7, v1.8.2
  • Welotec EG500Mk2-B11001-000101 <v1.7.7, v1.8.2
  • Welotec EG500Mk2-C11101-000101 <v1.7.7, v1.8.2
  • Welotec EG500Mk2-C11001-000101 <v1.7.7, v1.8.2
  • Welotec EG500Mk2-A12011-000101 <v1.7.7, v1.8.2
  • Welotec EG500Mk2-A11001-000201 <v1.7.7, v1.8.2
  • Welotec EG500Mk2-A21101-000101 <v1.7.7, v1.8.2
  • Welotec EG602W <v1.7.7, v1.8.2
  • Welotec EG602L <v1.7.7, v1.8.2
  • Welotec EG603W Mk2 <v1.7.7, v1.8.2
  • Welotec EG603L Mk2 <v1.7.7, v1.8.2
  • Welotec EG802W <v1.7.7, v1.8.2
  • Welotec EG804W <v1.7.7, v1.8.2
  • Welotec EG802W_i7_512GB_DinRail <v1.7.7, v1.8.2
  • Welotec EG802W_i7_512GB_w/o DinRail <v1.7.7, v1.8.2
  • Welotec EG804W Pro <v1.7.7, v1.8.2

Is CVE-2025-41702 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
last yr.

Exploit prediction

0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Welotec EG400Mk2-D11001-000101
  • Welotec EG400Mk2-D11101-000101
  • Welotec EG503W
  • Welotec EG503L
  • Welotec EG503W_4GB
  • Welotec EG503L_4GB
  • Welotec EG503L-G
  • Welotec EG500Mk2-A11101-000101
  • Welotec EG500Mk2-A11001-000101
  • Welotec EG500Mk2-B11101-000101
  • Welotec EG500Mk2-B11001-000101
  • Welotec EG500Mk2-C11101-000101
  • Welotec EG500Mk2-C11001-000101
  • Welotec EG500Mk2-A12011-000101
  • Welotec EG500Mk2-A11001-000201
  • Welotec EG500Mk2-A21101-000101
  • Welotec EG602W
  • Welotec EG602L
  • Welotec EG603W Mk2
  • Welotec EG603L Mk2
  • Welotec EG802W
  • Welotec EG804W
  • Welotec EG802W_i7_512GB_DinRail
  • Welotec EG802W_i7_512GB_w/o DinRail
  • Welotec EG804W Pro

Classification

Weakness
  • CWE-321 Use of Hard-coded Cryptographic Key

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.