Is this vulnerability remotely exploitable beyond the local network?

It can be, depending on configuration. If the router's management interface is exposed to the internet (for example, through remote administration), an attacker on the internet could exploit it. If it is limited to the LAN, exploitation generally requires access to the local network or a way to pivot into it.

What level of access does an attacker need to exploit this issue?

The attacker needs the ability to send HTTP requests to the setRemoteCfg endpoint. In some configurations this may require valid credentials, while in others weak or default credentials or misconfigurations could reduce that barrier.

What is the safest general fix pattern for developers and firmware maintainers?

Eliminate shell-based command construction entirely from web handlers, enforce strict validation on configuration parameters (like enable) against fixed, typed values, and rely on safe system APIs rather than invoking a shell.

Severity:

HIGH RISK

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setRemoteCfg Endpoint

CVE-2026-5690

Published:

Apr 6, 2026

Status:

Received

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-77;CWE-78

Impact:

Remote Code Execution on Router Firmware

Severity:

HIGH RISK

(7.3)

CVSS Version:

3.1

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-77;CWE-78

Impact:

Remote Code Execution on Router Firmware

Severity:

HIGH RISK

(7.3)

CVSS Version:

3.1

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OS Command Injection (CWE-78) in Totolink A7100RU setRemoteCfg Endpoint

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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