---
id: CVE-2021-42875
title: >-
  TOTOLINK EX1200T V4.1.2cu.5215 contains a remote command injection
  vulnerability in the function setDiagnosisCfg of the file
  lib/cste_modules/system.so to control the ipDoamin.
summary: >-
  TOTOLINK EX1200T V4.1.2cu.5215 contains a remote command injection
  vulnerability in the function setDiagnosisCfg of the file
  lib/cste_modules/system.so to control the ipDoamin.
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-78
vendor: totolink
product: ex1200t_firmware
affected:
  - ex1200t_firmware = 4.1.2cu.5215
published: '2022-06-02'
updated: '2026-07-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-42875'
references:
  - url: 'http://totolink.net'
    label: cve@mitre.org
  - url: 'https://github.com/p1Kk/vuln/blob/main/totolink_ex1200t_ipdoamin_rce.md'
    label: cve@mitre.org
  - url: 'http://ex1200t.com'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://totolink.net'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://github.com/p1Kk/vuln/blob/main/totolink_ex1200t_ipdoamin_rce.md'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.04365
epssPercentile: 0.90846
ingestedAt: '2026-07-06T17:03:24.403Z'
---

## Overview

TOTOLINK EX1200T V4.1.2cu.5215 contains a remote command injection vulnerability in the function setDiagnosisCfg of the file lib/cste_modules/system.so to control the ipDoamin.

## Affected

- `ex1200t_firmware = 4.1.2cu.5215`

## Remediation

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