Is this vulnerability remotely exploitable over the internet?

It can be, but only if the router's management interface or the vulnerable CGI endpoint is exposed beyond the local network (for example, via remote management features, port forwarding, or misconfiguration). Otherwise, exploitation typically requires local network access.

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

The attacker needs network-level access to send HTTP requests to the router's web interface. No additional local code execution is required; command execution happens on the router itself if the crafted `firewallType` parameter is processed.

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

The safest pattern is to remove shell invocation from configuration paths entirely and use safe, parameterized system APIs instead. Where system calls are unavoidable, enforce strict allowlists for parameters, avoid string concatenation for commands, and ensure that user input never reaches the shell parser unchecked.

Severity:

HIGH RISK

(7.3)

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

CVE-2026-5691

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 setRemoteCfg Endpoint

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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Ask AI for summary of CodeAnt

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

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 setRemoteCfg Endpoint

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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