CVE-2025-15047 is a stack-based buffer overflow vulnerability identified in the Tenda WH450 router firmware version 1.0.0.18. The flaw exists in the HTTP request handler component, specifically in the /goform/PPTPDClient endpoint, where improper validation of the Username parameter allows an attacker to overflow the stack buffer. This vulnerability can be exploited remotely without requiring authentication or user interaction, making it highly accessible to attackers. The buffer overflow can lead to arbitrary code execution, enabling attackers to gain control over the device, manipulate network traffic, or disrupt router functionality. The vulnerability has been assigned a CVSS 4.0 score of 9.3, reflecting its critical severity and the high impact on confidentiality, integrity, and availability. Although no confirmed exploits in the wild have been reported, the public availability of exploit code significantly raises the risk of exploitation. The vulnerability affects only version 1.0.0.18 of the Tenda WH450 firmware, and no official patches have been linked yet. The attack vector is network-based, targeting the HTTP service exposed by the router, which is commonly accessible in many deployments. This flaw highlights the importance of secure input validation in embedded device web interfaces and the risks posed by exposed management endpoints.

The impact of CVE-2025-15047 is severe for organizations using the Tenda WH450 router, especially those with remote management enabled or devices exposed to untrusted networks. Successful exploitation can lead to complete compromise of the router, allowing attackers to execute arbitrary code with system-level privileges. This can result in interception or manipulation of network traffic, unauthorized access to internal networks, disruption of internet connectivity, and potential lateral movement to other devices. The confidentiality of sensitive data traversing the network can be compromised, integrity of communications altered, and availability of network services disrupted. Given the critical nature and ease of exploitation, this vulnerability poses a significant risk to enterprise, SMB, and home networks relying on this device. The lack of authentication and user interaction requirements lowers the barrier for attackers, increasing the likelihood of widespread exploitation once exploit code is leveraged. Organizations in sectors with high reliance on network infrastructure, such as finance, healthcare, and government, face elevated risks of targeted attacks or widespread disruption.

1. Immediately restrict access to the router's HTTP management interface by disabling remote management or limiting it to trusted IP addresses only. 2. Implement network segmentation to isolate the Tenda WH450 devices from critical internal networks and sensitive assets. 3. Monitor network traffic for unusual HTTP requests targeting the /goform/PPTPDClient endpoint, which may indicate exploitation attempts. 4. Apply strict input validation and filtering at network perimeter devices to block malformed or suspicious requests. 5. Contact Tenda support or check official channels regularly for firmware updates addressing this vulnerability and apply patches as soon as they become available. 6. If patching is not immediately possible, consider replacing affected devices with models from vendors with a strong security track record. 7. Educate network administrators about the risks of exposed management interfaces and enforce strong security policies around device configuration. 8. Employ intrusion detection/prevention systems (IDS/IPS) with signatures for this vulnerability once available to detect and block exploitation attempts.