CVE-2025-4116: Critical Buffer Overflow Vulnerability in Netgear JWNR2000v2 1.0.0.11

Overview

A critical vulnerability, identified as CVE-2025-4116, has been discovered in Netgear JWNR2000v2 1.0.0.11. This vulnerability specifically targets the function get_cur_lang_ver and can be exploited remotely. Due to its severity, this issue is of significant concern to those utilizing the affected product, as it poses a serious threat to system integrity, potentially leading to system compromise or data leakage.
This vulnerability is particularly alarming due to its critical rating and the fact that the vendor has been unresponsive to early disclosure attempts. Therefore, all users of the affected Netgear product are urged to take immediate action to mitigate the potential risks associated with this vulnerability.

Vulnerability Summary

CVE ID: CVE-2025-4116
Severity: Critical, CVSS Score 8.8
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

Product | Affected Versions

Netgear JWNR2000v2 | 1.0.0.11

How the Exploit Works

The vulnerability resides in the get_cur_lang_ver function of the Netgear JWNR2000v2 1.0.0.11 router. It can be exploited through manipulation of the host argument, which triggers a buffer overflow. This overflow can lead to unpredictable behavior, such as crashes, code execution, or an information leak. The attack can be launched remotely, and no user interaction is required, making it particularly dangerous.

Conceptual Example Code

The following is a conceptual example of how the vulnerability might be exploited. This example uses a malformed HTTP request to trigger the buffer overflow.

POST /get_cur_lang_ver HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "host": "AAAAAAAAAAAAAAA... [insert thousands of 'A's to cause a buffer overflow]" }

This request could potentially cause the affected router to crash or execute arbitrary code, leading to system compromise.

Mitigation Measures

Given the critical nature of this vulnerability, it is recommended that users of the affected product apply vendor patches as soon as they become available. In the meantime, or in the absence of vendor patches, users can mitigate the vulnerability by employing Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS) to monitor and filter out malicious traffic. Additionally, users should consider isolating the affected device from the rest of the network to minimize potential damage.