CVE-2025-41702

egOS WebGUI Hard-Coded JWT Secret Enables Authentication Bypass

9.8CriticalCVSS base score
0.52%Exploitation in 30 daysEPSS · top 55% of all CVEs
NoKnown exploitednot in CISA's KEV catalog
NonePublic exploitsnone known yet

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.

Timeline

2025
16 Apr 2025
16 Apr 2025
ID reserved
By CERTVDE
26 Aug 20254 months later
26 Aug 2025· 4 months later
Published

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2025-41702, by who scored it
Scored by	CVSS	Score	Vector
CERTVDECNA (assigner)	3.1	Critical9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Deferred	3.1	Critical9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS (exploitation in 30 days): 0.52% · top 55% of all CVEs (12 Nov 2026)
CISA SSVC: Exploitation: none · Automatable: yes · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.

Affected products

Welotec · EG400Mk2-D11001-000101
- affected 0.0.0 – < v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG400Mk2-D11101-000101
- affected 0.0.0 – < v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG503W
- affected 0.0.0 – < v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG503L
- affected 0.0.0 – < v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG503W_4GB
- affected 0.0.0 – < v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG503L_4GB
- affected 0.0.0 – < v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG503L-G
- affected 0.0.0 – < v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG500Mk2-A11101-000101
- affected 0.0.0 – < v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG500Mk2-A11001-000101
- affected 0.0.0 – < v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG500Mk2-B11101-000101
- affected 0.0.0 – < <v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG500Mk2-B11001-000101
- affected 0.0.0 – < <v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG500Mk2-C11101-000101
- affected 0.0.0 – < <v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG500Mk2-C11001-000101
- affected 0.0.0 – < <v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG500Mk2-A12011-000101
- affected 0.0.0 – < <v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG500Mk2-A11001-000201
- affected 0.0.0 – < <v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG500Mk2-A21101-000101
- affected 0.0.0 – < <v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG602W
- affected 0.0.0 – < <v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG602L
- affected 0.0.0 – < <v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG603W Mk2
- affected 0.0.0 – < <v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG603L Mk2
- affected 0.0.0 – < <v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG802W
- affected 0.0.0 – < <v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG804W
- affected 0.0.0 – < <v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG802W_i7_512GB_DinRail
- affected 0.0.0 – < <v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG802W_i7_512GB_w/o DinRail
- affected 0.0.0 – < <v1.7.7
- affected v1.8.0 – < v1.8.2
Welotec · EG804W Pro
- affected 0.0.0 – < <v1.7.7
- affected v1.8.0 – < v1.8.2

References1

https://certvde.com/de/advisories/VDE-2025-076 (opens in a new tab)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

[![CVE-2025-41702](https://cveledger.app/badge/CVE-2025-41702.svg)](https://cveledger.app/cve/CVE-2025-41702)

Record last updated 26 Aug 2025, 19:39 UTC.