CVE-2025-7602 in DI-8100
Summary
by MITRE • 07/14/2025
A vulnerability was found in D-Link DI-8100 16.07.26A1 and classified as critical. This issue affects some unknown processing of the file /arp_sys.asp of the component HTTP Request Handler. The manipulation leads to stack-based buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 07/14/2025
The vulnerability identified as CVE-2025-7602 represents a critical stack-based buffer overflow flaw within the D-Link DI-8100 router firmware version 16.07.26A1. This vulnerability resides in the HTTP Request Handler component and specifically targets the /arp_sys.asp file processing functionality. The flaw stems from inadequate input validation and bounds checking during the handling of HTTP requests, creating an exploitable condition that allows attackers to overwrite adjacent memory locations on the stack. The vulnerability's classification as critical reflects its potential for severe impact on network security and system integrity, particularly given the widespread deployment of D-Link routers in both enterprise and residential environments.
The technical execution of this vulnerability occurs through remote exploitation via HTTP requests directed to the affected router's web interface. When a malicious actor sends a specially crafted request containing overly long input data to the /arp_sys.asp endpoint, the insufficient buffer size validation causes the program to write beyond allocated memory boundaries. This stack overflow condition can be leveraged to execute arbitrary code on the affected device, potentially leading to complete system compromise. The attack vector's remote nature eliminates the need for physical access to the device, making it particularly dangerous as it can be exploited from anywhere on the internet. The public disclosure of exploit code further amplifies the threat level, as it removes the barrier to entry for malicious actors who may not possess advanced exploitation capabilities.
The operational impact of CVE-2025-7602 extends beyond simple system compromise to encompass complete network infrastructure control. Successful exploitation could enable attackers to gain root access to the router, allowing them to modify network configurations, redirect traffic, establish persistent backdoors, or use the compromised device as a pivot point for attacking other systems within the local network. The vulnerability affects not just individual devices but entire network segments, as compromised routers can serve as entry points for broader network infiltration. Organizations relying on D-Link DI-8100 devices face significant risks including data exfiltration, man-in-the-middle attacks, and disruption of network services. The vulnerability's presence in the HTTP Request Handler component means that any web-based management or monitoring activities could be exploited, making it particularly concerning for network administrators who rely on web interfaces for device management.
Mitigation strategies for CVE-2025-7602 should prioritize immediate firmware updates from D-Link, as the vendor is expected to release patches addressing the buffer overflow condition through proper input validation and memory management. Network segmentation and firewall rules should be implemented to restrict access to router management interfaces, limiting exposure to unauthorized users. Additionally, monitoring for suspicious HTTP traffic patterns and implementing intrusion detection systems can help identify exploitation attempts. The vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which is classified under the Common Weakness Enumeration framework as a fundamental software security flaw that frequently leads to remote code execution. From an ATT&CK framework perspective, this vulnerability maps to techniques such as T1059 Command and Scripting Interpreter and T1071.001 Application Layer Protocol HTTP, representing a critical threat that requires immediate attention from security teams. Organizations should also consider disabling unnecessary web management interfaces and implementing multi-factor authentication for any remaining access points to reduce the attack surface and provide additional defense layers against exploitation attempts.