OS Command Injection in Totolink A7100RU Firewall Function (Remote

Publication date: 2026-04-06

Last updated on: 2026-04-29

Assigner: VulDB

Description

A vulnerability has been found in Totolink A7100RU 7.4cu.2313_b20191024. This affects the function setFirewallType of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument firewallType leads to os command injection. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-04-06

Last Modified

2026-04-29

Generated

2026-07-06

AI Q&A

2026-04-07

EPSS Evaluated

2026-07-05

NVD

CVE-2026-5691

EUVD

EUVD-2026-19555

Affected Vendors & Products

Vendor	Product	Version / Range
totolink	a7100ru	7.4cu.2313_b20191024

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-78	The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
CWE-77	The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

Attack-Flow Graph

Executive Summary

This vulnerability exists in the Totolink A7100RU router, specifically in the function setFirewallType within the file /cgi-bin/cstecgi.cgi. It occurs because the firewallType argument can be manipulated, leading to an operating system command injection. This means an attacker can remotely execute arbitrary commands on the device.

Impact Analysis

The vulnerability allows remote attackers to execute arbitrary OS commands on the affected device without any authentication or user interaction. This can lead to unauthorized control over the router, potentially compromising network security, intercepting or altering network traffic, and disrupting normal device operation.

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