CVE-2025-10547: Critical Remote Code Execution Vulnerability in DrayTek Vigor Routers

CVE-2025-10547: Critical Remote Code Execution Vulnerability in DrayTek Vigor Routers

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A single overlooked flaw in a widely used router can open the door to attackers across the globe. That’s exactly what happened with the discovery of CVE-2025-10547—a critical vulnerability in DrayTek Vigor routers. Security researcher Pierre-Yves Maes from ChapsVision uncovered that an uninitialized stack value in the router’s Web User Interface could let remote attackers execute arbitrary code, simply by sending a specially crafted HTTP or HTTPS request. This isn’t just a theoretical risk: the exploit was successfully demonstrated, highlighting the real-world danger for businesses and individuals relying on these devices. DrayTek responded quickly, urging users to update their firmware and tighten network controls, but the incident underscores how even a single bug can ripple through the digital ecosystem (BleepingComputer).

Understanding the CVE-2025-10547 Vulnerability

Technical Details of CVE-2025-10547

The CVE-2025-10547 vulnerability is a critical security flaw identified in several models of DrayTek Vigor routers. This vulnerability arises from an uninitialized stack value, which can be exploited by remote attackers to achieve remote code execution (RCE). The flaw is triggered when unauthenticated remote attackers send specially crafted HTTP or HTTPS requests to the device’s Web User Interface (WebUI). The exploitation of this vulnerability can lead to memory corruption and potentially a system crash, which may allow for the execution of arbitrary code. This vulnerability was reported to DrayTek by Pierre-Yves Maes, a security researcher from ChapsVision, on July 22, 2025. (BleepingComputer)

Impact on Affected Devices

The impact of CVE-2025-10547 is significant due to the potential for remote code execution, which can compromise the security and functionality of affected devices. The vulnerability affects several models of DrayTek Vigor routers, including Vigor1000B, Vigor2962, and Vigor3910/3912. These models are widely used in various networking environments, making the potential impact of this vulnerability broad and severe. Successful exploitation could allow attackers to execute arbitrary code, potentially leading to unauthorized access, data theft, or further network compromise. DrayTek has advised users to upgrade to firmware version 4.4.3.6 or later (some models require 4.4.5.1) to mitigate this risk. (BleepingComputer)

Mitigation Strategies

To mitigate the risk posed by CVE-2025-10547, DrayTek has provided several recommendations. Users are advised to upgrade their router firmware to the specified versions to address the vulnerability. Additionally, DrayTek suggests reducing WAN exposure by disabling remote WebUI/SSL VPN access or restricting it using Access Control Lists (ACLs) or Virtual Local Area Networks (VLANs). Despite these measures, the WebUI remains accessible over the LAN, which means that local attackers could still exploit the vulnerability. Therefore, it is crucial for users to implement robust network security practices, such as monitoring network traffic for suspicious activity and ensuring that only authorized devices have access to the network. (BleepingComputer)

Exploit Development and Testing

The CVE-2025-10547 vulnerability was successfully exploited by the researcher who discovered it. By leveraging the uninitialized stack value, the researcher was able to create an exploit that demonstrated the potential for remote code execution on affected DrayTek devices. This successful exploitation highlights the severity of the vulnerability and underscores the importance of promptly addressing it through firmware updates and other mitigation strategies. The exploit development process involved crafting specific HTTP or HTTPS requests that could trigger the vulnerability, leading to memory corruption and the execution of arbitrary code. This process requires a deep understanding of the affected devices’ architecture and the ability to manipulate network protocols to achieve the desired outcome. (BleepingComputer)

Broader Implications and Industry Response

The discovery and disclosure of CVE-2025-10547 have broader implications for the networking hardware industry. It serves as a reminder of the importance of secure coding practices and the need for regular security assessments to identify and address vulnerabilities before they can be exploited by malicious actors. The industry response to such vulnerabilities typically involves collaboration between security researchers, vendors, and users to develop and implement effective mitigation strategies. In the case of DrayTek, the company’s prompt advisory and firmware updates demonstrate a commitment to addressing security issues and protecting users from potential threats. However, the ongoing challenge of securing complex networking devices underscores the need for continuous vigilance and proactive security measures across the industry. (BleepingComputer)

Final Thoughts

The CVE-2025-10547 vulnerability in DrayTek Vigor routers is a stark reminder that network security is only as strong as its weakest link. While DrayTek’s swift release of firmware updates and mitigation advice is commendable, the incident highlights the ongoing challenge of securing complex, internet-connected devices. As routers and other IoT hardware become more deeply embedded in our daily lives and business operations, the stakes for timely patching and vigilant monitoring have never been higher. This case also illustrates the value of collaboration between researchers, vendors, and users in responding to emerging threats. Staying ahead of attackers means not just fixing bugs, but fostering a culture of proactive security and continuous improvement (BleepingComputer).

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