---
id: CVE-2021-42877
title: >-
  TOTOLINK EX1200T V4.1.2cu.5215 contains a denial of service vulnerability in
  function RebootSystem of the file lib/cste_modules/system which can reboot the
  system.
summary: >-
  TOTOLINK EX1200T V4.1.2cu.5215 contains a denial of service vulnerability in
  function RebootSystem of the file lib/cste_modules/system which can reboot the
  system.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
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-2021-42877'
references:
  - url: 'http://totolink.net/'
    label: cve@mitre.org
  - url: 'https://github.com/p1Kk/vuln/blob/main/totolink_ex1200t_reboot.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_reboot.md'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.01668
epssPercentile: 0.75363
ingestedAt: '2026-07-06T17:03:24.404Z'
---

## Overview

TOTOLINK EX1200T V4.1.2cu.5215 contains a denial of service vulnerability in function RebootSystem of the file lib/cste_modules/system which can reboot the system.

## Affected

- `ex1200t_firmware = 4.1.2cu.5215`

## Remediation

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