CVE-2025-6371 in DIR-619L
Summary
by MITRE • 06/21/2025
A vulnerability, which was classified as critical, has been found in D-Link DIR-619L 2.06B01. Affected by this issue is the function formSetEnableWizard of the file /goform/formSetEnableWizard. The manipulation of the argument curTime leads to stack-based buffer overflow. The attack may be launched 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.
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Analysis
by VulDB Data Team • 06/25/2025
The vulnerability identified as CVE-2025-6371 represents a critical stack-based buffer overflow flaw within the D-Link DIR-619L router firmware version 2.06B01. This security weakness resides in the formSetEnableWizard function located within the /goform/formSetEnableWizard file, which is part of the web-based administrative interface. The vulnerability specifically manifests when processing the curTime argument, where improper input validation allows an attacker to manipulate the argument in a manner that overflows the allocated stack buffer. This type of buffer overflow constitutes a fundamental memory corruption vulnerability that can lead to arbitrary code execution and complete system compromise. The issue is particularly concerning because it affects a network device that serves as a primary gateway for home and small office networks, making it a valuable target for attackers seeking persistent access to network infrastructure.
The technical exploitation of this vulnerability requires remote access to the affected router's web interface, as the attack vector is reachable through network-based communication. The stack-based buffer overflow occurs when an attacker sends a specially crafted curTime parameter that exceeds the buffer's allocated memory space, causing adjacent memory locations to be overwritten. This memory corruption can potentially overwrite return addresses, function pointers, or other critical program state information, enabling attackers to redirect execution flow and inject malicious code. The vulnerability's classification as critical stems from its remote exploitability and the potential for complete system compromise, which aligns with CWE-121 stack-based buffer overflow weakness. The attack surface is further expanded by the fact that this vulnerability has been publicly disclosed and is actively being used in the wild, indicating that threat actors have already developed working exploits.
The operational impact of CVE-2025-6371 extends beyond simple system compromise, as it enables attackers to gain full administrative control over affected D-Link DIR-619L devices. This level of access allows malicious actors to modify router configurations, redirect network traffic, establish persistent backdoors, and potentially use the compromised device as a launch point for attacks against other systems within the network. The vulnerability's exploitation can result in data exfiltration, network monitoring, and disruption of network services, making it particularly dangerous for organizations that rely on these devices for network infrastructure. Given that the affected products are no longer supported by the maintainer, users cannot receive official security patches or updates to address this flaw, leaving them exposed to ongoing threats. This situation is consistent with ATT&CK technique T1046 network service scanning and T1059 command and scripting interpreter, as attackers can leverage the compromised device to conduct further reconnaissance and lateral movement within networks.
Mitigation strategies for this vulnerability are severely limited due to the end-of-life status of the affected D-Link DIR-619L models, but organizations should consider immediate hardware replacement or decommissioning of affected devices. Network segmentation and firewall rules can help reduce the attack surface by limiting access to the affected devices, while monitoring for unusual network traffic patterns may help detect exploitation attempts. The lack of official vendor support for this vulnerability means that users should not expect security updates, making physical device replacement the most effective long-term solution. Additionally, network administrators should implement robust access controls for router administrative interfaces, including strong authentication mechanisms and limiting administrative access to trusted network segments. Organizations should also consider implementing network intrusion detection systems to monitor for exploitation attempts and maintain comprehensive network monitoring to identify potential compromise indicators. The vulnerability's public disclosure status necessitates immediate action, as the window for exploitation is already open and actively being used by threat actors in the current threat landscape.