The vulnerability CVE-2025-14879 affects the Tenda WH450 router running firmware version 1.0.0.18. It is a stack-based buffer overflow located in the HTTP Request Handler component, specifically in the /goform/onSSIDChange endpoint. The vulnerability arises from improper handling of the ssid_index parameter, which when manipulated, causes a buffer overflow on the stack. This flaw allows an unauthenticated remote attacker to send specially crafted HTTP requests to the router, triggering the overflow and potentially enabling arbitrary code execution. The vulnerability does not require any user interaction or prior authentication, making it highly exploitable over the network. The CVSS 4.0 score of 9.3 reflects the critical nature of this vulnerability, with high impacts on confidentiality, integrity, and availability. Although no active exploitation has been reported yet, the availability of a public exploit increases the risk of imminent attacks. The vulnerability can lead to full compromise of the affected device, allowing attackers to control network traffic, intercept sensitive data, or launch further attacks within the network. The lack of an official patch at the time of publication necessitates immediate defensive measures to mitigate risk.

For European organizations, exploitation of this vulnerability could result in severe consequences including unauthorized access to internal networks, interception and manipulation of sensitive communications, disruption of network services, and potential lateral movement within corporate environments. Organizations relying on Tenda WH450 routers for critical connectivity, especially in sectors such as finance, healthcare, government, and telecommunications, face heightened risks. The compromise of these devices could undermine data confidentiality, integrity, and availability, potentially leading to data breaches, operational downtime, and reputational damage. Given the remote, unauthenticated nature of the exploit, attackers can target vulnerable devices at scale, increasing the likelihood of widespread impact across European enterprises and public sector networks.

1. Immediate network segmentation to isolate Tenda WH450 devices from critical infrastructure and sensitive data flows. 2. Deploy network-based intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics to detect and block malicious HTTP requests targeting /goform/onSSIDChange. 3. Monitor network traffic for unusual or repeated requests to the vulnerable endpoint, and implement rate limiting or firewall rules to restrict access. 4. Engage with Tenda for official firmware updates and apply patches as soon as they become available. 5. Where patching is delayed, consider temporary device replacement or disabling remote management interfaces to reduce exposure. 6. Conduct thorough inventory and asset management to identify all affected devices within the organization. 7. Educate network administrators on the vulnerability and ensure incident response plans include steps for this specific threat. 8. Regularly review and update router configurations to minimize attack surface, including disabling unnecessary services and enforcing strong access controls.