CVE-2025-10814 is a command injection vulnerability identified in the D-Link DIR-823X router models with firmware versions 240126, 240802, and 250416. The vulnerability resides in an unspecified functionality within the /usr/sbin/goahead binary, which is part of the router's embedded web server or management interface. The flaw is triggered by manipulation of the 'port' argument, allowing an attacker to inject arbitrary commands that the system executes. This vulnerability can be exploited remotely without requiring user interaction or prior authentication, making it particularly dangerous. The CVSS 4.0 base score is 5.3, indicating a medium severity level. The vector details show that the attack is network-based (AV:N), requires low attack complexity (AC:L), no privileges (PR:L, which is low but not none), no user interaction (UI:N), and partial impacts on confidentiality, integrity, and availability (VC:L, VI:L, VA:L). The vulnerability has been publicly disclosed, but there are no known exploits currently observed in the wild. The absence of patches or mitigation links suggests that vendor fixes may not yet be available or publicly announced. Given the nature of command injection vulnerabilities, successful exploitation could allow attackers to execute arbitrary system commands, potentially leading to full device compromise, unauthorized access to network traffic, or pivoting attacks within the internal network. The vulnerability affects a widely used consumer and small office router model, which is often deployed in home and small business environments, but also in some enterprise edge scenarios.

For European organizations, this vulnerability poses a significant risk, especially for small and medium-sized enterprises (SMEs) and home office setups that rely on D-Link DIR-823X routers for internet connectivity. Exploitation could lead to unauthorized control over the router, enabling attackers to intercept, modify, or redirect network traffic, degrade network availability, or use the compromised device as a foothold for further attacks within the corporate network. Confidentiality of sensitive communications could be compromised, and integrity of network operations disrupted. Given the remote and unauthenticated nature of the exploit, attackers could scan for vulnerable devices across Europe and launch automated attacks. This could be particularly impactful for organizations with limited IT security resources or those that do not regularly update or monitor their network infrastructure. Additionally, critical infrastructure or public sector organizations using these devices could face operational disruptions or data breaches. The medium severity rating suggests that while the vulnerability is serious, exploitation may require some conditions or limitations that reduce its overall impact compared to critical vulnerabilities.

1. Immediate mitigation should include isolating affected D-Link DIR-823X devices from critical network segments to limit potential lateral movement if compromised. 2. Network administrators should monitor network traffic for unusual activity originating from or targeting these routers, including unexpected command execution patterns or outbound connections. 3. Implement strict firewall rules to restrict remote access to router management interfaces, ideally limiting access to trusted IP addresses or internal networks only. 4. Disable any remote management features on the affected devices if not strictly necessary. 5. Regularly check for firmware updates or security advisories from D-Link and apply patches as soon as they become available. 6. Consider replacing vulnerable devices with models from vendors with a strong security track record if patches are delayed. 7. Employ network segmentation and intrusion detection/prevention systems to detect and contain exploitation attempts. 8. Educate users and administrators about the risks of using default or outdated router firmware and the importance of timely updates.