How widely exploitable is this vulnerability?

It can be exploited remotely by anyone who can reach the router's management interface and interact with the vulnerable CGI endpoint, making it high-impact in typical home or small office deployments where LAN access is common and remote management may be enabled.

Does exploitation require authentication?

That depends on the device's configuration and access control around `/cgi-bin/cstecgi.cgi`. In some setups, valid administrative credentials may be required; in others, weak or missing authentication can make the endpoint accessible to unauthenticated attackers on the reachable network.

What is the safest general fix pattern?

The most robust fix is to remove all shell-based command construction from the CGI handler, using dedicated system APIs or well-defined library calls, and tightly constrain parameters like `sambaEnabled` to a small set of known-good values through strict validation.

Severity:

CRITICAL RISK

(9.8)

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

CVE-2026-5976

Published:

Apr 9, 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

CRITICAL RISK

CRITICAL

(9.8)

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

Remote Code Execution on the Router

April 12, 2026

CWE-77;CWE-78

CRITICAL RISK

CRITICAL

(9.8)

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

Remote Code Execution on the Router

April 12, 2026

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-77;CWE-78

Impact:

Remote Code Execution on Network Device

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-77;CWE-78

Impact:

Remote Code Execution on Network Device

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

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

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

CRITICAL RISK

CRITICAL

(9.8)

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

CRITICAL RISK

CRITICAL

(9.8)

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

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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