Overview
This report covers a critical vulnerability discovered in TP-Link TL-WR841N V11, specifically the /userRpm/WlanNetworkRpm_APC.htm file. The vulnerability, identified as CVE-2025-53713, arises due to lack of input parameter validation, leading to buffer overflow. The potential impact of this vulnerability is severe, including system crashes and a denial-of-service (DoS) condition. As this vulnerability can be exploited remotely and affects products no longer supported by the maintainer, the risk is heightened.
Vulnerability Summary
CVE ID: CVE-2025-53713
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise, data leakage, and DoS condition
Affected Products
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Product | Affected Versions
TP-Link TL-WR841N | V11
How the Exploit Works
The exploit takes advantage of a lack of input parameter validation in the /userRpm/WlanNetworkRpm_APC.htm file. By sending specially crafted data, an attacker can overflow the buffer, causing the web service to crash and possibly leading to a denial-of-service condition. The attack can be launched remotely, increasing the potential risk.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited using a malicious HTTP POST request:
POST /userRpm/WlanNetworkRpm_APC.htm HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "input_parameter": "A"*10000 } // A large amount of data to overflow the bufferThis example involves sending an oversized amount of data (‘A’*10000) as the input parameter, thereby exploiting the lack of input validation and overflowing the buffer.
Mitigation Guidance
As the affected products are no longer supported by the maintainer, the primary mitigation is to apply the vendor patch. For temporary mitigation, use a Web Application Firewall (WAF) or an Intrusion Detection System (IDS), which can detect and block attempts to exploit this vulnerability.
