CVE-2025-4450 is a critical buffer overflow vulnerability identified in the D-Link DIR-619L router, specifically version 2.04B04. The flaw exists in the function formSetEasy_Wizard, where improper handling of the argument curTime allows an attacker to overflow a buffer. This vulnerability can be exploited remotely without user interaction or authentication, making it highly accessible to attackers. The buffer overflow could lead to arbitrary code execution, potentially allowing an attacker to take full control of the affected device. The vulnerability has a CVSS 4.0 base score of 8.7, indicating high severity, with network attack vector, low attack complexity, no privileges required, and no user interaction needed. The impact metrics indicate high confidentiality, integrity, and availability impacts, meaning the attacker could exfiltrate sensitive data, alter device configurations, or disrupt network services. Notably, the affected product is no longer supported by the vendor, D-Link, which means no official patches or updates are available to remediate this issue. Although no known exploits are currently reported in the wild, the ease of exploitation and critical nature of the vulnerability make it a significant threat. The lack of vendor support increases the risk for organizations still using this hardware, as they cannot rely on official fixes and must consider alternative mitigation strategies or device replacement.

For European organizations, this vulnerability poses a serious risk, especially for those still operating legacy network infrastructure with the D-Link DIR-619L router. Exploitation could lead to full compromise of the router, enabling attackers to intercept or manipulate network traffic, launch further attacks within the internal network, or cause denial of service. This could impact confidentiality of sensitive communications, integrity of network configurations, and availability of critical network services. Given the router’s typical deployment in small office/home office (SOHO) environments, small and medium enterprises (SMEs) and remote workers in Europe could be disproportionately affected. The absence of vendor support complicates remediation, increasing the likelihood of prolonged exposure. Additionally, critical sectors such as finance, healthcare, and government entities using these devices may face regulatory compliance issues under GDPR if personal data is compromised. The threat also extends to supply chain security, as compromised routers could serve as entry points for broader attacks on European organizations.

Since no official patches are available due to end-of-life status, European organizations should prioritize immediate replacement of the affected D-Link DIR-619L devices with supported and updated hardware. As an interim measure, network administrators should isolate these routers from critical network segments and restrict remote management access via firewall rules or network segmentation to limit exposure. Disabling any unnecessary services or features related to the vulnerable function (formSetEasy_Wizard) may reduce attack surface, if configurable. Monitoring network traffic for unusual activity and deploying intrusion detection/prevention systems (IDS/IPS) with signatures targeting buffer overflow attempts can help detect exploitation attempts. Organizations should also conduct asset inventories to identify affected devices and ensure they are removed or mitigated promptly. Finally, educating users about the risks of legacy hardware and enforcing strict network access controls will help reduce potential impact.