Is this vulnerability remotely exploitable over the internet?

It can be, but only if the router's management interface (and specifically the `/cgi-bin/cstecgi.cgi` endpoint) is exposed beyond the local network or reachable via remote administration features. In many default setups, the risk is primarily from attackers with access to the same LAN.

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

An attacker needs network-level connectivity to the device's web management port. Depending on how authentication is implemented for the affected function, they may also need valid credentials, though misconfigurations or design choices could expose the vulnerable functionality with weak or no authentication.

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

The most robust fix is to remove direct shell command construction from CGI handlers, replacing it with safer system APIs that do not invoke a shell and that pass arguments as structured parameters. Additionally, enforce strict whitelisting for all firmware upgrade inputs and centralize input validation logic.

Severity:

HIGH RISK

(7.3)

OS Command Injection (CWE-78) in Totolink WA300 Firmware Upgrade Handler

CVE-2026-4497

Published:

Mar 20, 2026

Status:

Analyzed

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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May 6, 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 WA300 Firmware Upgrade 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

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

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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