CVE-2025-10547 is a critical security vulnerability identified in the DrayTek Vigor1000B router series, specifically within the HTTP CGI request argument processing component of DrayOS. The root cause is a missing initialization of a variable (CWE-456), which leads to unpredictable memory states during request handling. This memory corruption can be exploited remotely by an unauthenticated attacker to execute arbitrary code on the device, effectively gaining full control over the router. The vulnerability does not require any user interaction, making it highly exploitable over the network. The CVSS v3.1 base score of 9.8 reflects the vulnerability's high impact on confidentiality, integrity, and availability, combined with its low attack complexity and lack of required privileges. Although no public exploits have been reported yet, the severity and nature of the flaw suggest that weaponized exploits could emerge rapidly. The affected product, Vigor1000B, is commonly deployed in enterprise and ISP environments for network routing and security functions. The absence of available patches increases the urgency for organizations to implement interim protective measures. This vulnerability could allow attackers to disrupt network operations, intercept or manipulate traffic, and pivot into internal networks, posing a significant threat to organizational security.

For European organizations, the impact of CVE-2025-10547 is substantial. Successful exploitation could lead to complete compromise of network perimeter devices, resulting in unauthorized access to internal networks, data exfiltration, and disruption of critical services. Given the router’s role in managing traffic and enforcing security policies, attackers could bypass firewalls, launch man-in-the-middle attacks, or deploy malware within corporate networks. This is particularly concerning for sectors such as finance, healthcare, government, and critical infrastructure, where network integrity and confidentiality are paramount. The lack of authentication and user interaction requirements means attackers can exploit this remotely and stealthily, increasing the risk of widespread attacks. Additionally, the potential for denial of service through device instability could disrupt business continuity. The vulnerability’s presence in widely used network equipment amplifies the threat to European digital infrastructure and data privacy compliance obligations under regulations like GDPR.

Given the absence of official patches, European organizations should immediately implement the following mitigations: 1) Disable remote HTTP management interfaces on Vigor1000B routers to reduce exposure to external attackers. 2) Restrict management access to trusted internal networks or VPNs only. 3) Employ network segmentation to isolate vulnerable routers from critical systems and sensitive data environments. 4) Monitor network traffic for anomalous HTTP CGI requests indicative of exploitation attempts. 5) Deploy intrusion detection/prevention systems (IDS/IPS) with signatures targeting suspicious memory corruption or RCE patterns related to DrayTek devices. 6) Maintain up-to-date asset inventories to identify all affected devices and prioritize remediation. 7) Engage with DrayTek support channels for early patch notifications and test updates in controlled environments before deployment. 8) Prepare incident response plans specific to router compromise scenarios. These steps go beyond generic advice by focusing on reducing attack surface, early detection, and containment tailored to this vulnerability’s characteristics.