---
id: CVE-2026-5688
title: >-
  A security vulnerability has been detected in Totolink A7100RU
  7.4cu.2313_b20191024
summary: >-
  A security vulnerability has been detected in Totolink A7100RU
  7.4cu.2313_b20191024. Impacted is the function setDdnsCfg of the file
  /cgi-bin/cstecgi.cgi. Such manipulation of the argument provider leads to os
  command injection. The atta…
severity: high
cvss: 7.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-77
  - CWE-78
published: '2026-04-06'
updated: '2026-07-24'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-5688'
references:
  - url: >-
      https://github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_186/README.md
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/792945'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/355515'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/355515/cti'
    label: cna@vuldb.com
  - url: 'https://www.totolink.net/'
    label: cna@vuldb.com
tags:
  - nvd
epss: 0.0155
epssPercentile: 0.74005
ingestedAt: '2026-07-24T09:23:52.572Z'
---

## Overview

A security vulnerability has been detected in Totolink A7100RU 7.4cu.2313_b20191024. Impacted is the function setDdnsCfg of the file /cgi-bin/cstecgi.cgi. Such manipulation of the argument provider leads to os command injection. The attack may be launched remotely. The exploit has been disclosed publicly and may be used.

## Remediation

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