---
id: CVE-2020-29189
title: >-
  Incorrect Access Control vulnerability in TerraMaster TOS <= 4.2.06 allows
  remote authenticated attackers to bypass read-only restriction and obtain full
  access to any folder within the NAS
summary: >-
  Incorrect Access Control vulnerability in TerraMaster TOS <= 4.2.06 allows
  remote authenticated attackers to bypass read-only restriction and obtain full
  access to any folder within the NAS
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
vendor: terra-master
product: tos
affected:
  - tos <= 4.2.06
published: '2020-12-24'
updated: '2026-07-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-29189'
references:
  - url: 'https://www.ihteam.net/advisory/terramaster-tos-multiple-vulnerabilities/'
    label: cve@mitre.org
  - url: 'http://terramaster.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.ihteam.net/advisory/terramaster-tos-multiple-vulnerabilities/'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.01888
epssPercentile: 0.78653
ingestedAt: '2026-07-05T00:59:25.591Z'
---

## Overview

Incorrect Access Control vulnerability in TerraMaster TOS <= 4.2.06 allows remote authenticated attackers to bypass read-only restriction and obtain full access to any folder within the NAS

## Affected

- `tos <= 4.2.06`

## Remediation

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