OS Command Injection in Totolink A8000RU CGI Handler

Publication date: 2026-04-27

Last updated on: 2026-04-27

Assigner: VulDB

Description

A weakness has been identified in Totolink A8000RU 7.1cu.643_b20200521. This affects the function setAdvancedInfoShow of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Executing a manipulation of the argument tty_server can lead to os command injection. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-04-27

Last Modified

2026-04-27

Generated

2026-07-06

AI Q&A

2026-04-28

EPSS Evaluated

2026-07-05

NVD

CVE-2026-7154

Affected Vendors & Products

Vendor	Product	Version / Range
totolink	a8000ru	7.1cu.643_b20200521

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

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 full compromise of the device, including unauthorized access, data theft, disruption of services, or using the device as a foothold for further attacks.

Executive Summary

This vulnerability exists in the Totolink A8000RU router, specifically in the function setAdvancedInfoShow within the CGI Handler component. It involves the manipulation of the argument tty_server in the /cgi-bin/cstecgi.cgi file, which can lead to operating system command injection. This means an attacker can remotely execute arbitrary commands on the affected device.

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