CVE-2025-6617 in DIR-619L
Summary
by MITRE • 06/25/2025
A vulnerability was found in D-Link DIR-619L 2.06B01 and classified as critical. This issue affects the function formAdvanceSetup of the file /goform/formAdvanceSetup. The manipulation of the argument webpage leads to stack-based buffer overflow. The attack may be initiated 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 • 06/26/2025
The vulnerability identified as CVE-2025-6617 represents a critical stack-based buffer overflow in D-Link DIR-619L routers running firmware version 2.06B01. This flaw resides within the formAdvanceSetup function of the /goform/formAdvanceSetup file, making it accessible through web-based exploitation. The vulnerability specifically targets the webpage argument parameter, which when manipulated beyond its intended bounds, causes a buffer overflow condition that can be exploited to execute arbitrary code on the affected device. The attack vector is remote, meaning that an attacker can exploit this vulnerability without requiring physical access to the device, potentially allowing for complete system compromise and unauthorized access to the network.
The technical nature of this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions where insufficient boundary checking allows attackers to overwrite adjacent memory locations. The exploitability of this flaw is particularly concerning as it has been publicly disclosed and is actively being used in the wild, indicating that threat actors have already developed working exploits against affected devices. The vulnerability's remote attack capability means that attackers can potentially gain unauthorized access to network infrastructure from anywhere on the internet, making it a significant threat to network security. The fact that this affects a legacy device model that is no longer supported by the vendor compounds the severity, as users cannot receive official security updates or patches to address the issue.
The operational impact of CVE-2025-6617 extends beyond simple device compromise, as it can enable attackers to establish persistent access points within networks, potentially allowing for data exfiltration, man-in-the-middle attacks, or use as a launching point for further network infiltration. The compromised router can serve as a backdoor for attackers to monitor network traffic, redirect requests to malicious sites, or even facilitate lateral movement within the network. This vulnerability directly maps to several ATT&CK techniques including T1071.004 for application layer protocol usage, T1566 for phishing with malicious attachments, and T1059 for command and scripting interpreter usage. The lack of vendor support for the affected model means that users cannot rely on official security patches, leaving them vulnerable to continued exploitation.
Mitigation strategies for this vulnerability should prioritize immediate network segmentation and access control measures to limit potential damage from exploitation. Organizations should implement network monitoring to detect unusual traffic patterns that might indicate router compromise, particularly looking for unexpected connections or traffic routing changes. The most effective long-term solution involves replacing the affected D-Link DIR-619L devices with supported models that receive regular security updates and firmware patches. Network administrators should also consider implementing firewall rules that restrict access to the router management interfaces from untrusted networks, and deploy intrusion detection systems to monitor for exploitation attempts. Additionally, users should be educated about the risks of using unsupported network equipment and the importance of maintaining current firmware versions on all network infrastructure components to prevent similar vulnerabilities from being exploited in the future.