CVE-2025-70251 in DIR-513
Summary
by MITRE • 03/10/2026
Stack buffer overflow vulnerability in D-Link DIR-513 v1.10 via the webPage parameter to goform/formWlanGuestSetup.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 03/16/2026
The CVE-2025-70251 vulnerability represents a critical stack buffer overflow flaw discovered in D-Link DIR-513 router firmware version 1.10. This vulnerability specifically manifests within the web interface's handling of the webPage parameter in the goform/formWlanGuestSetup endpoint, making it accessible through HTTP requests sent to the device's web management interface. The issue stems from inadequate input validation and bounds checking within the firmware's web server component, which processes user-supplied parameters without proper sanitization mechanisms. This particular vulnerability affects the router's wireless guest network setup functionality, which is commonly used by administrators to configure guest access to the network. The stack buffer overflow occurs when an attacker submits a maliciously crafted webPage parameter that exceeds the allocated buffer space, leading to potential memory corruption and arbitrary code execution. This flaw exists at the application layer within the router's embedded web server implementation, making it exploitable through remote network access.
The technical exploitation of this vulnerability requires an attacker to send a specially crafted HTTP request containing an oversized webPage parameter to the vulnerable endpoint. The buffer overflow occurs during the processing of this parameter within the router's firmware code, where the input is copied into a fixed-size stack buffer without proper length verification. This type of vulnerability falls under CWE-121 Stack-based Buffer Overflow, which is classified as a critical weakness in software security. The attack vector is remote and does not require authentication, making it particularly dangerous as it can be exploited by anyone with network access to the router. The vulnerability's impact extends beyond simple denial of service, as successful exploitation could lead to complete system compromise, allowing attackers to execute arbitrary code with the privileges of the web server process. This represents a significant risk to network security, as the router serves as a central point of access control for the entire network infrastructure.
The operational impact of this vulnerability poses severe risks to organizations and individuals using D-Link DIR-513 routers in their network environments. Network administrators who rely on these devices for wireless access control and guest network management face potential compromise of their entire network infrastructure. Once exploited, the vulnerability could allow attackers to gain persistent access to the router's management interface, enabling them to modify network configurations, establish backdoors, or redirect traffic to malicious endpoints. The vulnerability also presents risks for data exfiltration, as compromised routers can serve as entry points for broader network infiltration activities. From an ATT&CK framework perspective, this vulnerability aligns with techniques such as T1059 Command and Scripting Interpreter and T1078 Valid Accounts, as successful exploitation could enable attackers to establish persistent access and execute commands on the compromised device. The vulnerability's remote exploitability means that attackers can target these devices from outside the network perimeter, making it particularly concerning for organizations that do not properly segment their network infrastructure.
Mitigation strategies for CVE-2025-70251 should prioritize immediate firmware updates from D-Link, as the vendor is expected to release patches addressing this specific buffer overflow vulnerability. Network administrators should implement network segmentation to isolate critical infrastructure from guest networks and ensure that administrative access to these devices is restricted to trusted networks only. Monitoring network traffic for suspicious requests containing oversized parameters or unusual patterns in the goform/formWlanGuestSetup endpoint can help detect potential exploitation attempts. Additionally, implementing web application firewalls and intrusion detection systems can provide additional layers of protection by filtering malicious requests before they reach the vulnerable endpoint. Organizations should also consider disabling guest network functionality if it is not essential for their operations, reducing the attack surface. Regular vulnerability assessments and penetration testing should be conducted to identify similar weaknesses in other network devices, as this vulnerability demonstrates the importance of proper input validation in embedded systems and web applications. The vulnerability underscores the necessity of following secure coding practices and conducting thorough security testing for firmware components, particularly those handling user input in network infrastructure devices.