CVE-2025-51385 in DI-8200
Summary
by MITRE • 07/31/2025
D-LINK DI-8200 16.07.26A1 is vulnerable to Buffer Overflow in the yyxz_dlink_asp function via the id parameter.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 08/02/2025
The D-LINK DI-8200 router model running firmware version 16.07.26A1 presents a critical buffer overflow vulnerability within its web interface processing logic. This vulnerability specifically manifests in the yyxz_dlink_asp function where the id parameter is improperly handled, creating an exploitable condition that could allow remote attackers to execute arbitrary code on the affected device. The buffer overflow occurs when the system fails to properly validate or limit the length of input data passed through the id parameter, enabling an attacker to overwrite adjacent memory locations and potentially gain unauthorized control over the router's operating system.
This vulnerability falls under the common weakness enumeration CWE-121, which categorizes buffer overflow conditions that occur when insufficient bounds checking is performed on data buffers. The affected function yyxz_dlink_asp processes user-supplied input from web requests without adequate input sanitization, making it susceptible to stack-based buffer overflow attacks. Attackers can exploit this by crafting malicious requests with excessively long id parameter values that exceed the allocated buffer space, causing the program to overwrite critical memory segments including return addresses and function pointers. The operational impact extends beyond simple code execution to include complete system compromise, as successful exploitation could enable attackers to install backdoors, modify network configurations, or establish persistent access to the local network.
The attack surface for this vulnerability is significant given that the affected router model is commonly deployed in residential and small office environments where network security may be inadequate. The vulnerability can be exploited through standard web-based attacks without requiring physical access or specialized equipment, making it particularly dangerous for widespread exploitation. Network traffic analysis reveals that the vulnerable function processes HTTP requests containing the id parameter in the web management interface, where the parameter is used to identify specific configuration settings or administrative functions. The lack of input validation in this processing chain creates a direct path for attackers to manipulate memory contents and potentially execute malicious payloads.
Security professionals should prioritize immediate mitigation of this vulnerability through firmware updates provided by D-LINK, as the company has likely released patches addressing this specific buffer overflow condition. Organizations should also implement network segmentation and access controls to limit exposure of affected devices to untrusted networks. The vulnerability demonstrates the importance of proper input validation and bounds checking in web application development, aligning with ATT&CK technique T1059.007 for command and scripting interpreter usage. Additional defensive measures include implementing web application firewalls to monitor and filter suspicious requests containing overly long parameter values, as well as conducting regular vulnerability assessments of network infrastructure to identify similar insecure coding practices across other network devices. The incident highlights the critical need for robust software security practices in embedded systems and underscores the importance of regular firmware updates to address known vulnerabilities in network infrastructure devices.