CVE-2025-14879 is a stack-based buffer overflow vulnerability identified in the Tenda WH450 router firmware version 1.0.0.18. The vulnerability resides in an unspecified function within the HTTP request handler component, specifically processing requests to the /goform/onSSIDChange endpoint. The flaw arises from improper validation and handling of the ssid_index parameter, which an attacker can manipulate to cause a stack overflow. This overflow can overwrite critical memory regions, potentially allowing arbitrary code execution or causing a denial of service. The vulnerability is remotely exploitable without requiring any authentication or user interaction, making it highly accessible to attackers. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and very high impacts on confidentiality, integrity, and availability (VC:H/VI:H/VA:H). Although no exploits have been observed in the wild, proof-of-concept exploit code has been publicly released, increasing the likelihood of exploitation attempts. The vulnerability affects only version 1.0.0.18 of the Tenda WH450 firmware, and no official patches have been linked or published yet. The Tenda WH450 is a consumer-grade wireless router commonly used in residential and small office environments, which may lack robust security monitoring, increasing the risk of successful exploitation. Attackers exploiting this vulnerability could gain full control over the device, intercept or manipulate network traffic, or disrupt network availability.

The impact of CVE-2025-14879 is severe for organizations and individuals relying on the Tenda WH450 router. Successful exploitation can lead to remote code execution with system-level privileges, allowing attackers to take full control of the device. This can result in interception and manipulation of network traffic, unauthorized access to internal networks, deployment of malware or ransomware, and disruption of network services. The compromise of a router also undermines the confidentiality and integrity of all data passing through it, potentially exposing sensitive information. For organizations, this could mean breaches of customer data, intellectual property theft, and operational downtime. Small businesses and home users are particularly vulnerable due to limited security resources and the common use of default or weak configurations. The availability of public exploit code increases the risk of widespread attacks, including automated scanning and exploitation campaigns. The lack of a patch at the time of disclosure further exacerbates the threat, necessitating immediate mitigation efforts to reduce exposure.

1. Immediate mitigation should include disabling remote management interfaces on the Tenda WH450 router to prevent external exploitation. 2. Network segmentation should be implemented to isolate vulnerable devices from critical infrastructure and sensitive data. 3. Monitor network traffic for unusual requests targeting the /goform/onSSIDChange endpoint or abnormal ssid_index parameter values. 4. Employ intrusion detection and prevention systems (IDS/IPS) with updated signatures to detect exploitation attempts. 5. Restrict access to the router’s management interface to trusted IP addresses only. 6. If possible, upgrade to a newer firmware version once Tenda releases a patch addressing this vulnerability. 7. As a temporary workaround, consider disabling or restricting SSID change functionality if configurable. 8. Educate users and administrators about the risks and signs of exploitation to enable rapid response. 9. Regularly audit network devices for outdated firmware and apply security updates promptly. 10. Consider replacing affected devices with more secure alternatives if patching is not feasible in a timely manner.