Overview

This report provides a detailed analysis of the CVE-2025-45835 vulnerability discovered in Netis WF2880 v2.1.40207. This vulnerability presents a significant threat to system stability and data security as attackers can exploit it to crash the system and potentially compromise data, leading to a Denial-of-Service (DoS) attack.

Vulnerability Summary

CVE ID: CVE-2025-45835
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

Product | Affected Versions

Netis WF2880 | v2.1.40207

How the Exploit Works

The vulnerability exists in the FUN_004904c8 function of the cgitest.cgi file. Attackers can exploit this vulnerability by controlling the environment variable value CONTENT_LENGTH, causing a null pointer dereference. This can lead to the program crashing, thereby potentially causing a denial-of-service attack or even a system compromise or data leakage.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited. This pseudocode demonstrates altering the CONTENT_LENGTH environment variable.

#!/bin/bash
export CONTENT_LENGTH=99999999999
./cgitest.cgi

Please note that this is a conceptual example and real-world exploitation might require additional steps or specific conditions.

Solution

For mitigation, it is recommended to apply the vendor patch as soon as it becomes available. As a temporary mitigation, use a Web Application Firewall (WAF) or an Intrusion Detection System (IDS). These systems can help identify and block potential exploit attempts.