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CVE-2025-50635: Null Pointer Dereference Vulnerability in Netis WF2780 v2.2.35445

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Overview

This report discusses a critical vulnerability identified as CVE-2025-50635, found in Netis WF2780 v2.2.35445. The vulnerability is a null pointer dereference flaw that can potentially lead to a denial-of-service (DoS) attack, impacting the availability of the system. This vulnerability is significant as it could allow attackers to crash the program, potentially leading to system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2025-50635
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: DoS attack, potential system compromise, and data leakage

Affected Products

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Product | Affected Versions

Netis WF2780 | v2.2.35445

How the Exploit Works

The vulnerability exists in the FUN_0048a728 function of the cgitest.cgi file. An attacker can exploit this vulnerability by manipulating the CONTENT_LENGTH variable. A null pointer dereference occurs when the program attempts to reference an address location that has not been assigned a value. This manipulation leads to a system crash, causing a possible denial-of-service (DoS) scenario. In some cases, it may even be possible to execute arbitrary code or cause a system compromise.

Conceptual Example Code

Here is a conceptual example of a HTTP POST request that might be used to exploit this vulnerability:

POST /cgitest.cgi HTTP/1.1
Host: target.example.com
Content-Length: [malicious value]
{ "malicious_payload": "..." }

In this conceptual example, the Content-Length value is manipulated to trigger a null pointer dereference in the FUN_0048a728 function.

Mitigation

The best solution is to apply the vendor-released patch as soon as possible to fix this vulnerability. In the meantime, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as a temporary mitigation strategy to help detect and block attacks trying to exploit this vulnerability. Regularly updating and patching systems is also strongly recommended as part of a robust cybersecurity strategy.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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