CVE-2025-4450 in DIR-619L
Summary
by MITRE • 05/09/2025
A vulnerability, which was classified as critical, was found in D-Link DIR-619L 2.04B04. Affected is the function formSetEasy_Wizard. The manipulation of the argument curTime leads to buffer overflow. It is possible to launch the attack remotely. The vendor was contacted early about this disclosure. This vulnerability only affects products that are no longer supported by the maintainer.
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Analysis
by VulDB Data Team • 05/09/2025
The vulnerability identified as CVE-2025-4450 represents a critical buffer overflow flaw within the D-Link DIR-619L 2.04B04 router firmware, specifically impacting the formSetEasy_Wizard function. This issue arises from improper input validation when processing the curTime argument, creating a condition where attacker-controlled data can exceed the allocated buffer space. The vulnerability's classification as critical stems from its remote exploitability and the potential for arbitrary code execution or system compromise. The affected device operates within a typical home or small office network environment, making it a significant target for attackers seeking persistent network access or data interception capabilities.
The technical implementation of this vulnerability demonstrates a classic buffer overflow condition where the curTime parameter lacks adequate bounds checking or sanitization before being processed by the formSetEasy_Wizard function. This flaw allows an attacker to craft malicious input that overflows the designated buffer, potentially overwriting adjacent memory locations including return addresses or function pointers. The attack vector is particularly concerning as it operates remotely without requiring authentication, enabling exploitation from outside the network perimeter. According to CWE standards, this vulnerability maps to CWE-121, which describes stack-based buffer overflow conditions, and CWE-787, which addresses out-of-bounds write vulnerabilities. The implementation likely involves a combination of stack manipulation and memory corruption techniques that align with ATT&CK technique T1059.007 for command and scripting interpreter.
The operational impact of this vulnerability extends beyond simple system compromise, potentially enabling attackers to gain persistent access to the network infrastructure, intercept sensitive communications, or establish backdoor access points. Given that the affected D-Link DIR-619L model is no longer supported by the vendor, users face limited remediation options, creating a persistent security risk for organizations and individuals who continue to operate these devices. The lack of official patches or firmware updates for unsupported products leaves the network infrastructure exposed to exploitation attempts. Security professionals should consider this vulnerability as part of broader network reconnaissance efforts, particularly when assessing legacy network equipment that may not receive security updates. The remote exploitability factor means that attackers can target these devices from any location with internet connectivity, making the vulnerability particularly dangerous in environments where network segmentation is inadequate.
Mitigation strategies for this vulnerability must account for the unsupported nature of the affected device while addressing the immediate security risk. Network administrators should implement strict network segmentation to isolate affected devices from critical infrastructure and sensitive data systems. The most effective immediate solution involves physical removal of the device from the network or implementation of strict firewall rules that block access to the vulnerable web interface. Organizations should also consider deploying network monitoring solutions to detect anomalous traffic patterns that may indicate exploitation attempts. Additionally, implementing intrusion detection systems with signatures for known buffer overflow patterns can help identify exploitation attempts. The vulnerability's classification as critical underscores the importance of immediate action, as attackers may already be actively exploiting similar vulnerabilities in unsupported network equipment. Security teams should also conduct comprehensive inventory audits to identify all instances of this device model and ensure appropriate remediation measures are implemented across the entire network infrastructure.