CVE-2025-13258 is a remotely exploitable buffer overflow vulnerability found in the Tenda AC20 wireless router firmware versions up to 16.03.08.12. The vulnerability resides in an unspecified function related to the /goform/WifiExtraSet endpoint, where the argument wpapsk_crypto is improperly handled, leading to a buffer overflow condition. This flaw allows an unauthenticated remote attacker to send specially crafted requests to the router’s web interface, triggering the overflow and potentially enabling arbitrary code execution or causing the device to crash (denial of service). The vulnerability does not require user interaction or prior authentication, making exploitation straightforward. The CVSS 4.0 score of 8.7 reflects the high impact on confidentiality, integrity, and availability, combined with low attack complexity and no privileges required. Although no active exploitation has been reported, a public exploit is available, increasing the urgency for mitigation. The affected firmware versions span from 16.03.08.0 through 16.03.08.12, covering all incremental updates in that range. The vulnerability could allow attackers to gain control over the router, intercept or manipulate network traffic, or disrupt network connectivity.

The impact of CVE-2025-13258 is significant for organizations using Tenda AC20 routers, especially in environments where these devices serve as primary network gateways or handle sensitive data. Successful exploitation could lead to full compromise of the router, allowing attackers to execute arbitrary code, alter router configurations, intercept or redirect network traffic, and disrupt network availability. This can result in data breaches, man-in-the-middle attacks, and denial of service conditions affecting business operations. The vulnerability’s remote and unauthenticated nature increases the risk of widespread exploitation, particularly in environments with exposed management interfaces or insufficient network segmentation. Organizations relying on Tenda AC20 devices in critical infrastructure, enterprise networks, or public-facing environments face heightened risks of operational disruption and data compromise.

To mitigate CVE-2025-13258, organizations should immediately check for firmware updates from Tenda addressing this vulnerability and apply them as soon as they become available. In the absence of an official patch, network administrators should restrict access to the router’s management interface by implementing firewall rules that limit access to trusted IP addresses only. Disabling remote management features or changing default management ports can reduce exposure. Network segmentation should be enforced to isolate vulnerable devices from critical systems. Monitoring network traffic for unusual requests targeting /goform/WifiExtraSet or abnormal behavior on Tenda AC20 devices can help detect exploitation attempts. Additionally, organizations should consider replacing affected devices with models from vendors with a stronger security track record if patching is not feasible. Regularly auditing device firmware versions and configurations will help maintain security posture.