CVE-2025-7602 is a critical stack-based buffer overflow vulnerability identified in the D-Link DI-8100 router, specifically version 16.07.26A1. The vulnerability exists in the HTTP Request Handler component when processing the /arp_sys.asp file. An attacker can remotely exploit this flaw by sending a specially crafted HTTP request to the affected endpoint, causing a stack-based buffer overflow. This type of overflow can overwrite the call stack, potentially allowing arbitrary code execution or causing a denial of service. The vulnerability requires no user interaction and can be triggered remotely over the network, increasing its risk profile. The CVSS 4.0 score is 8.6 (high severity), reflecting the vulnerability's network attack vector, low complexity, and no need for authentication, but it does require high privileges (PR:H) on the device, which suggests exploitation might require some form of prior access or elevated rights. The vulnerability impacts confidentiality, integrity, and availability, as successful exploitation could allow attackers to execute arbitrary code, disrupt device operation, or intercept sensitive network traffic. Although no public exploits are currently known in the wild, the disclosure of the vulnerability and its exploitability means threat actors could develop or have developed exploits. The lack of available patches at the time of publication increases the urgency for mitigation and monitoring. Given the critical role of routers like the DI-8100 in network infrastructure, this vulnerability poses a significant risk to organizations relying on this hardware for connectivity and security.

For European organizations, the impact of CVE-2025-7602 could be substantial, particularly for enterprises, ISPs, and government agencies using the D-Link DI-8100 router. Exploitation could lead to unauthorized network access, interception of internal communications, disruption of network services, and potential lateral movement within corporate networks. This could result in data breaches, operational downtime, and compromise of sensitive information. The vulnerability's ability to be exploited remotely without user interaction increases the risk of widespread attacks, especially in environments where these routers are deployed at network perimeters or critical infrastructure points. Additionally, the potential for arbitrary code execution could allow attackers to implant persistent backdoors or launch further attacks against connected systems. Given the criticality of network infrastructure in sectors such as finance, healthcare, and public administration in Europe, exploitation could have cascading effects on service availability and data protection compliance, including GDPR implications.

1. Immediate network segmentation: Isolate affected D-Link DI-8100 devices from critical network segments to limit potential lateral movement. 2. Access control: Restrict management interfaces of the affected routers to trusted IP addresses and use VPNs or secure tunnels for administrative access. 3. Monitor network traffic: Implement IDS/IPS rules to detect anomalous HTTP requests targeting /arp_sys.asp or unusual traffic patterns indicative of exploitation attempts. 4. Firmware updates: Engage with D-Link support channels to obtain any available patches or firmware updates addressing this vulnerability. If no official patch exists, consider temporary replacement or decommissioning of affected devices. 5. Incident response readiness: Prepare to detect and respond to potential exploitation by enabling detailed logging on routers and connected network devices. 6. Privilege management: Since exploitation requires high privileges, review and harden device access credentials and administrative policies to prevent unauthorized privilege escalation. 7. Vendor communication: Maintain active communication with D-Link for updates and advisories related to this vulnerability. 8. Network hardening: Disable unnecessary services and interfaces on the router to reduce the attack surface.