CVE-2025-7908 in DI-8100
Summary
by MITRE • 07/21/2025
A vulnerability was found in D-Link DI-8100 1.0. It has been declared as critical. Affected by this vulnerability is the function sprintf of the file /ddns.asp?opt=add of the component jhttpd. The manipulation of the argument mx leads to stack-based buffer overflow. The attack can be launched remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 07/21/2025
The vulnerability identified as CVE-2025-7908 represents a critical stack-based buffer overflow in the D-Link DI-8100 1.0 router firmware, specifically within the jhttpd web server component. This flaw exists in the /ddns.asp?opt=add endpoint where the sprintf function processes user-supplied input through the mx argument. The issue arises from inadequate input validation and bounds checking in the web application layer, creating a pathway for malicious actors to manipulate memory layout and potentially execute arbitrary code. The vulnerability affects the Dynamic Domain Name System functionality of the router, which is commonly used for remote access and network management purposes.
The technical exploitation of this vulnerability occurs through remote manipulation of the mx parameter in the HTTP request to the affected endpoint. When the sprintf function processes this unvalidated input, it fails to check the length of the provided data against the buffer size allocated for storage, resulting in a classic stack-based buffer overflow condition. This type of vulnerability is categorized under CWE-121 Stack-based Buffer Overflow, which falls within the broader category of memory safety issues that have been extensively documented in cybersecurity literature. The attack vector requires no authentication and can be executed through a simple HTTP request, making it particularly dangerous for network infrastructure devices.
The operational impact of this vulnerability extends beyond simple exploitation, as it presents a significant risk to network security and integrity. A successful attack could allow remote code execution on the affected router, potentially enabling attackers to gain full administrative control over the device. This control could be used to modify network configurations, redirect traffic, establish persistent backdoors, or use the device as a pivot point for attacking other systems within the local network. The vulnerability's classification as critical by the vendor indicates the severe implications for network security, particularly in enterprise and home network environments where these devices often serve as primary network gateways.
Security mitigations for CVE-2025-7908 should include immediate firmware updates from D-Link if available, network segmentation to limit access to affected devices, and implementation of intrusion detection systems to monitor for exploitation attempts. Organizations should also consider disabling unnecessary services such as the DDNS functionality if not required, and implementing network access controls to restrict access to the affected router's web interface. The vulnerability's public disclosure status means that automated exploitation tools may already exist, making prompt remediation essential. This issue aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter and T1046 for Network Service Scanning, representing both execution and reconnaissance phases of an attack lifecycle. Organizations should also conduct comprehensive network assessments to identify other potentially vulnerable devices running similar firmware versions, as similar vulnerabilities may exist in the broader D-Link product line.