Is this vulnerability remotely exploitable over the internet?

It can be, depending on how the device is deployed. If the management interface is exposed to the internet—e.g., via remote administration, UPnP misconfiguration, or port forwarding—attackers on the internet may be able to exploit it. If management is restricted to the local network, exploitation would typically require local or adjacent network access.

Does an attacker need valid credentials to exploit this issue?

That depends on how the firewall.cgi script is integrated with authentication. In many embedded products, some management CGI scripts are protected by HTTP authentication, while others may be misconfigured or partially exposed. An attacker's effort is significantly reduced if default or weak credentials are used, but the core requirement is the ability to reach and invoke the vulnerable endpoint.

What is the safest general fix pattern for developers?

The most robust fix is to remove shell parsing from the equation: avoid assembling shell commands from user input and instead call system utilities via APIs that accept pre-separated arguments. Combine this with strict allowlist validation for all CGI parameters and ensure that any user-controlled values cannot introduce shell metacharacters or alter the structure of the executed command.

Severity:

HIGH RISK

(7.2)

OS Command Injection via del_flag Parameter (CWE-77) in Wavlink WL-NU516U1 Firewall CGI

CVE-2026-2615

Published:

Feb 17, 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-306

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

Account Takeover / Loss of Account Control

February 17, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-74;CWE-77

Impact:

Remote Code Execution on Network Device

Severity:

HIGH RISK

(7.2)

CVSS Version:

3.1

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-74;CWE-77

Impact:

Remote Code Execution on Network Device

Severity:

HIGH RISK

(7.2)

CVSS Version:

3.1

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OS Command Injection via del_flag Parameter (CWE-77) in Wavlink WL-NU516U1 Firewall CGI

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)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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