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CVE-2025-53711: TP-Link TL-WR841N V11 Denial-of-Service (DoS) Vulnerability

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Overview

The CVE-2025-53711 vulnerability pertains to the TP-Link TL-WR841N V11 wireless router. This vulnerability has the potential to cause a denial-of-service (DoS) condition due to a buffer overflow in the /userRpm/WlanNetworkRpm.htm file. The affected product is no longer supported by the vendor, making it an ideal target for attackers.

Vulnerability Summary

CVE ID: CVE-2025-53711
Severity: High (7.5 – CVSS score)
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Impact: Denial-of-service (DoS) condition, potential system compromise or data leakage.

Affected Products

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Product | Affected Versions

TP-Link TL-WR841N | V11

How the Exploit Works

The vulnerability exists due to missing input validation in the /userRpm/WlanNetworkRpm.htm file. An attacker could exploit this vulnerability by sending a specially crafted request to the affected router, causing a buffer overflow that could lead to a crash of the web service and result in a denial-of-service (DoS) condition. This attack can be launched remotely.

Conceptual Example Code

A conceptual example of how the vulnerability might be exploited is shown below:

GET /userRpm/WlanNetworkRpm.htm?malicious_payload HTTP/1.1
Host: vulnerable_router_ip

In this example, `malicious_payload` could be a string designed to overflow the buffer, causing a crash of the web service.

Mitigation Guidance

Users are advised to apply the vendor patch to address this vulnerability as soon as it becomes available. In the meantime, as temporary mitigation, users are suggested to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS).

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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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