CVE-2025-46108 in DIR-513
Summary
by MITRE • 03/04/2026
D-link Dir-513 A1FW110 is vulnerable to Buffer Overflow in the function formTcpipSetup.
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Analysis
by VulDB Data Team • 03/06/2026
The D-Link DIR-513 A1FW110 router presents a critical buffer overflow vulnerability within its formTcpipSetup function, representing a significant security weakness that could allow remote code execution or system compromise. This vulnerability exists in the web-based management interface of the device, where user input is improperly validated and handled during TCP/IP configuration setup operations. The buffer overflow occurs when the device processes form data submitted through the web interface without adequate bounds checking, allowing malicious actors to overflow memory buffers and potentially overwrite critical program execution data.
The technical flaw manifests in the insufficient input validation mechanisms within the formTcpipSetup function, which processes network configuration parameters submitted by users through the web management portal. When an attacker submits specially crafted input data exceeding the allocated buffer space, the excess data overflows into adjacent memory locations, potentially corrupting program execution flow. This type of vulnerability falls under CWE-121, which specifically addresses stack-based buffer overflow conditions, and can be categorized under the broader ATT&CK framework as T1203 - Exploitation for Client Execution or T1068 - Exploitation for Privilege Escalation depending on the attack vector and execution context.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as it creates potential pathways for complete system compromise. An unauthenticated remote attacker could leverage this buffer overflow to execute arbitrary code on the affected device, potentially gaining full administrative control over the router's operations. The attack surface is particularly concerning given that the vulnerability exists in the web interface, which is typically accessible from external networks, making the device susceptible to exploitation without requiring physical access or prior authentication. This vulnerability could enable attackers to redirect network traffic, establish backdoors, or use the compromised device as a pivot point for attacking internal network resources.
Mitigation strategies for this vulnerability should include immediate firmware updates from D-Link to address the buffer overflow condition in the formTcpipSetup function. Network administrators should also implement network segmentation and access controls to limit exposure of the affected device to untrusted networks. Additional protective measures include disabling unnecessary web management interfaces, implementing strong authentication mechanisms, and monitoring network traffic for suspicious activity patterns that might indicate exploitation attempts. The vulnerability demonstrates the critical importance of proper input validation and memory management practices in embedded network devices, as highlighted by industry standards such as the OWASP Top 10 and NIST cybersecurity guidelines for embedded systems security. Organizations should also consider implementing intrusion detection systems to monitor for exploitation attempts targeting this specific vulnerability class.