Is this vulnerability remotely exploitable over the internet?

It can be, if the router's management interface is exposed to the WAN or reachable via a routed path. If management access is limited to the local network, exploitation typically requires being on the same LAN or otherwise gaining local network access.

Does an attacker need valid credentials to exploit this issue?

That depends on the device's configuration. If the vulnerable endpoint is protected by authentication, an attacker would generally need valid credentials or another way to bypass authentication. If the endpoint is accessible without authentication due to misconfiguration or design, exploitation may be possible by any remote party who can reach the interface.

What is the safest general fix pattern for developers and vendors?

Avoid building shell commands from user-supplied data altogether. Use parameterized system APIs that do not invoke a shell, strictly whitelist permissible values for configuration fields, and centralize input validation logic so all CGI handlers treat external data as untrusted.

Severity:

HIGH RISK

(7.3)

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

CVE-2026-5689

Published:

Apr 6, 2026

Status:

Deferred

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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CWE-94

HIGH RISK

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PHP Code Injection via File Upload (CWE-94) in Aero CMS Admin Post Creation

Remote Code Execution by authenticated users via malicious file upload

May 10, 2026

CWE-94

HIGH RISK

HIGH

(8.8)

Code Injection (CWE-94) via Module Parameters in Evolution CMS

Remote Code Execution by Authenticated Users

May 10, 2026

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-77;CWE-78

Impact:

Remote Code Execution on the Router

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 the Router

Severity:

HIGH RISK

(7.3)

CVSS Version:

3.1

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

(8.8)

PHP Code Injection via File Upload (CWE-94) in Aero CMS Admin Post Creation

HIGH RISK

HIGH

(8.8)

Code Injection (CWE-94) via Module Parameters in Evolution CMS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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