CVE-2025-10547 is a security vulnerability identified in the DrayTek Corporation Vigor1000B router, specifically affecting version 4.4.5.1 of the DrayOS operating system. The vulnerability arises from an uninitialized variable within the HTTP CGI request arguments processing component. This flaw is categorized under CWE-456, which refers to the use of uninitialized variables. When a variable is not properly initialized before use, it can lead to unpredictable behavior, including memory corruption. In this case, an attacker can exploit this vulnerability by crafting malicious HTTP CGI requests to the router, triggering memory corruption that can result in remote code execution (RCE) on the device. RCE allows an attacker to execute arbitrary code with the privileges of the affected process, potentially gaining full control over the router. The vulnerability does not currently have a CVSS score assigned, and there are no known exploits in the wild at the time of publication. However, the nature of the flaw—memory corruption leading to RCE—makes it a serious security concern. The affected product, Vigor1000B, is a network appliance commonly used in enterprise and small-to-medium business environments for routing and network management. The lack of a patch link indicates that a fix may not yet be publicly available, increasing the urgency for affected users to monitor vendor communications and apply updates once released.

For European organizations, the exploitation of CVE-2025-10547 could have significant consequences. The Vigor1000B router often serves as a critical network gateway, and compromise could lead to unauthorized access to internal networks, interception or manipulation of network traffic, and disruption of network services. Confidentiality could be severely impacted if attackers gain access to sensitive data traversing the router. Integrity could be compromised through manipulation of routing or firewall rules, enabling further lateral movement or persistent access. Availability could also be affected if the device is rendered unstable or taken offline by an attacker. Given the strategic role of routers in network infrastructure, successful exploitation could facilitate broader attacks such as data exfiltration, espionage, or ransomware deployment. European organizations in sectors such as finance, government, healthcare, and critical infrastructure, which rely heavily on secure and stable network operations, would be particularly vulnerable. Additionally, regulatory frameworks like GDPR impose strict requirements on data protection, and a breach resulting from this vulnerability could lead to legal and financial penalties.

To mitigate the risk posed by CVE-2025-10547, European organizations should take several specific actions beyond generic advice. First, immediately inventory all network infrastructure to identify any Vigor1000B devices running the affected DrayOS version 4.4.5.1. Until an official patch is released, consider isolating these devices from untrusted networks or restricting management interfaces to trusted IP addresses only. Employ network segmentation to limit the exposure of vulnerable routers to potential attackers. Monitor network traffic for unusual HTTP CGI requests or other suspicious activity targeting the router’s management interfaces. Implement strict access controls and multi-factor authentication for router administration to reduce the risk of unauthorized exploitation. Regularly check DrayTek’s official channels for security advisories and promptly apply firmware updates once available. Additionally, consider deploying intrusion detection or prevention systems capable of recognizing exploitation attempts targeting this vulnerability. Finally, conduct security awareness training for network administrators to recognize and respond to signs of compromise related to router vulnerabilities.