CVE-2025-6615 in DIR-619L
Summary
by MITRE • 06/25/2025
A vulnerability, which was classified as critical, was found in D-Link DIR-619L 2.06B01. This affects the function formAutoDetecWAN_wizard4 of the file /goform/formAutoDetecWAN_wizard4. The manipulation of the argument curTime leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 06/26/2025
This critical vulnerability in D-Link DIR-619L 2.06B01 represents a stack-based buffer overflow flaw within the web-based management interface that poses significant security risks. The vulnerability resides in the formAutoDetecWAN_wizard4 function located at /goform/formAutoDetecWAN_wizard4, where improper input validation allows attackers to manipulate the curTime argument. This specific flaw falls under CWE-121 Stack-based Buffer Overflow, which is classified as a critical weakness in the Common Weakness Enumeration catalog. The vulnerability's remote exploitability means that attackers can trigger the buffer overflow without requiring physical access to the device, making it particularly dangerous for network-connected routers that are often deployed in home and small office environments.
The technical implementation of this vulnerability demonstrates how insufficient bounds checking in input parameters can lead to memory corruption. When the curTime argument is processed by the vulnerable function, the lack of proper validation allows an attacker to provide input that exceeds the allocated stack buffer space. This overflow can overwrite adjacent memory locations including return addresses, potentially enabling arbitrary code execution. The attack vector is particularly concerning as it leverages the device's web interface, which is commonly accessible to network users, and the exploit has been publicly disclosed, removing the need for advanced exploitation techniques. According to ATT&CK framework, this vulnerability maps to T1210 Exploitation of Remote Services and T1059 Command and Scripting Interpreter, as it allows for remote code execution through web-based exploitation.
The operational impact of this vulnerability extends beyond simple exploitation, as it can compromise the entire network infrastructure that relies on the affected router. Once successfully exploited, attackers can gain persistent access to the device, potentially using it as a pivot point for attacking other systems within the local network. The fact that this vulnerability affects a device that is no longer supported by the maintainer creates a particularly dangerous scenario where no official patches or updates exist to address the flaw. Organizations and individuals who continue to use unsupported devices face heightened risk, as they cannot benefit from vendor security updates or remediation guidance. The public disclosure of the exploit means that automated attack tools are likely available, increasing the probability of successful exploitation across vulnerable deployments.
Security mitigation strategies for this vulnerability are limited due to the end-of-life status of the affected device. The primary recommendation involves immediate network segmentation and access control measures to prevent unauthorized access to the router's management interface. Network administrators should implement strict firewall rules that block external access to the device's web management ports and consider disabling unnecessary services. Additionally, organizations should conduct comprehensive inventory audits to identify all instances of the affected device and plan for immediate replacement with supported models. The vulnerability serves as a stark reminder of the risks associated with maintaining legacy network equipment and highlights the importance of regular security assessments and timely device upgrades. Given the public availability of exploitation methods, immediate action is essential to prevent potential compromise of affected networks.