CVE-2025-7762 is a critical stack-based buffer overflow vulnerability identified in the D-Link DI-8100 router, specifically affecting firmware version 16.07.26A1. The flaw resides in the HTTP Request Handler component when processing requests to the /menu_nat_more.asp file. An attacker can remotely exploit this vulnerability by sending a specially crafted HTTP request to the affected endpoint, causing a stack-based buffer overflow. This overflow can lead to arbitrary code execution, potentially allowing the attacker to take full control of the device without requiring authentication or user interaction. The vulnerability has a CVSS 4.0 base score of 8.7, indicating high severity, with characteristics including network attack vector, low attack complexity, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability. Although no public exploits have been observed in the wild yet, the disclosure of the vulnerability and its critical nature make it a significant threat. The D-Link DI-8100 is a network device commonly used in small to medium-sized enterprise and residential environments for routing and network address translation (NAT) functions. Successful exploitation could allow attackers to disrupt network traffic, intercept sensitive data, or pivot into internal networks, posing serious security risks.

For European organizations, this vulnerability poses a substantial risk due to the widespread use of D-Link networking equipment in both corporate and residential settings. Exploitation could lead to unauthorized access to internal networks, data breaches, disruption of business operations, and potential lateral movement by attackers within organizational networks. Critical infrastructure and businesses relying on these routers for secure internet connectivity could face service outages or data compromise. Additionally, the ability to execute arbitrary code remotely without authentication increases the likelihood of automated attacks and wormable exploits, which could rapidly propagate across vulnerable devices in Europe. The impact is particularly severe for organizations with limited network segmentation or outdated firmware management practices, increasing their exposure to exploitation.

To mitigate this threat effectively, European organizations should: 1) Immediately identify and inventory all D-Link DI-8100 devices running firmware version 16.07.26A1 within their networks. 2) Apply any available firmware updates or patches from D-Link as soon as they are released; if no patch is currently available, contact D-Link support for guidance or consider temporary mitigations. 3) Restrict access to the management interface of affected devices by implementing network segmentation and firewall rules to limit HTTP access to trusted administrative hosts only. 4) Monitor network traffic for unusual or malformed HTTP requests targeting /menu_nat_more.asp or other suspicious activity indicative of exploitation attempts. 5) Employ intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics capable of detecting buffer overflow attempts against this vulnerability. 6) Consider replacing vulnerable devices with newer models that have updated security features if patching is not feasible. 7) Educate IT staff on the risks and signs of exploitation to ensure rapid detection and response.