---
id: CVE-2025-6139
title: >-
  A vulnerability, which was classified as problematic, has been found in
  TOTOLINK T10 4.1.8cu.5207
summary: >-
  A vulnerability, which was classified as problematic, has been found in
  TOTOLINK T10 4.1.8cu.5207. Affected by this issue is some unknown
  functionality of the file /etc/shadow.sample. The manipulation leads to use of
  hard-coded password.…
severity: low
cvss: 3.9
cvssVector: 'CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-255
  - CWE-259
vendor: totolink
product: t10_firmware
affected:
  - t10_firmware = 4.1.8cu.5207_b20210320
published: '2025-06-16'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T00:10:00.127'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-6139'
references:
  - url: >-
      https://candle-throne-f75.notion.site/TOTOLINK-T10-shadow-20ddf0aa118580f5a455cd5dbc521472
    label: cna@vuldb.com
  - url: 'https://vuldb.com/?ctiid.312608'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/?id.312608'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/?submit.592922'
    label: cna@vuldb.com
  - url: 'https://www.totolink.net/'
    label: cna@vuldb.com
tags:
  - nvd
epss: 0.00404
epssPercentile: 0.31912
ingestedAt: '2026-09-26T00:22:39.864Z'
---

## Overview

A vulnerability, which was classified as problematic, has been found in TOTOLINK T10 4.1.8cu.5207. Affected by this issue is some unknown functionality of the file /etc/shadow.sample. The manipulation leads to use of hard-coded password. The attack can only be initiated within the local network. The complexity of an attack is rather high. The exploitation is known to be difficult. The exploit has been disclosed to the public and may be used.

## Affected

- `t10_firmware = 4.1.8cu.5207_b20210320`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.