Is this vulnerability remotely exploitable over the internet?

It can be, if the device's management web interface is reachable from the internet (for example, due to remote administration being enabled, misconfigured port forwarding, or exposure via an upstream device). If the interface is restricted to the local network, exploitation is limited to attackers with LAN access or those who have already gained a foothold inside the network.

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

The attacker needs network-level access to send HTTP requests to the device's login endpoint. No valid credentials are required to exploit the command injection itself if the vulnerable code path runs before or independently of successful authentication.

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

The safest approach is to remove all direct shell invocation that incorporates user-controlled data and use parameterized, non-shell system calls instead. When external commands are unavoidable, inputs should be strictly validated against allowlists and passed as parameters, never concatenated into command strings.

Severity:

HIGH RISK

(7.3)

Command Injection via Host Header (CWE-77) in Tenda HG Series Login Interface

CVE-2026-1689

Published:

Jan 30, 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

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:

Command Injection

CWE:

CWE-74;CWE-77

Impact:

Remote Code Execution on Network Device

Severity:

HIGH RISK

(7.3)

CVSS Version:

3.1

Vulnerability Type

Category:

Command Injection

CWE:

CWE-74;CWE-77

Impact:

Remote Code Execution on Network Device

Severity:

HIGH RISK

(7.3)

CVSS Version:

3.1

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Command Injection via Host Header (CWE-77) in Tenda HG Series Login Interface

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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