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CVE-2025-53715: Denial of Service Vulnerability in TP-Link TL-WR841N V11

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Overview

This report discusses a significant vulnerability found in TP-Link TL-WR841N V11 devices. This vulnerability, identified as CVE-2025-53715, could potentially compromise the system or lead to data leakage. As the devices affected are no longer supported by the maintainer, it’s necessary for users to be aware and take corrective measures.

Vulnerability Summary

CVE ID: CVE-2025-53715
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage. The vulnerability may cause a crash of the web service, resulting in a denial-of-service (DoS) condition.

Affected Products

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Product | Affected Versions

TP-Link TL-WR841N | V11

How the Exploit Works

The vulnerability resides in the /userRpm/Wan6to4TunnelCfgRpm.htm file. It stems from a lack of proper input parameter validation, which can lead to a buffer overflow. An attacker can exploit this by sending maliciously crafted packets to the target device, which can cause the web service to crash, leading to a denial-of-service condition. Furthermore, it may also potentially compromise the system or lead to data leakage.

Conceptual Example Code

An example of how the vulnerability might be exploited is shown below. In this case, the attacker uses a POST request to send maliciously crafted data to the vulnerable endpoint.

POST /userRpm/Wan6to4TunnelCfgRpm.htm HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
{ "buffer_overflow_payload": "..." }

Mitigation and Prevention

The most effective way to mitigate this vulnerability is to apply a vendor patch. If that’s not available, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as temporary mitigation. Users are strongly advised to upgrade their devices to a version that is supported by the maintainer to continue receiving security updates and fixes.

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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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