CVE-2025-12619 is a buffer overflow vulnerability identified in the Tenda A15 router firmware version 15.13.07.13. The flaw exists in the fromSetWirelessRepeat function, specifically in the handling of the wpapsk_crypto2_4g parameter within the /goform/openNetworkGateway endpoint. This parameter is improperly validated, allowing an attacker to send a specially crafted request that overflows a buffer, potentially leading to arbitrary code execution on the device. The vulnerability is remotely exploitable without requiring authentication or user interaction, making it highly dangerous. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P) indicates network attack vector, low complexity, no authentication, no user interaction, and high impact on confidentiality, integrity, and availability. Although no exploits are currently observed in the wild, a proof-of-concept exploit has been published, which could facilitate attacks by malicious actors. The vulnerability could allow attackers to take full control of affected routers, leading to interception or manipulation of network traffic, disruption of services, or pivoting to internal networks. The lack of available patches at the time of publication increases the urgency for mitigation through network controls and monitoring.

For European organizations, exploitation of CVE-2025-12619 could result in severe consequences including unauthorized access to internal networks, interception of sensitive communications, disruption of internet connectivity, and potential lateral movement within corporate environments. Given that routers like the Tenda A15 often serve as the primary gateway for small to medium enterprises and home offices, compromise could lead to data breaches or enable attackers to launch further attacks on connected systems. Critical infrastructure sectors relying on these devices for connectivity may face operational disruptions. The remote, unauthenticated nature of the exploit increases the attack surface, especially for organizations with exposed management interfaces or insufficient network segmentation. The public availability of exploit code raises the likelihood of rapid weaponization and widespread scanning or exploitation attempts targeting vulnerable devices in Europe.

1. Immediately audit network environments to identify Tenda A15 devices running firmware version 15.13.07.13. 2. Disable remote management interfaces on affected routers to reduce exposure. 3. Implement network segmentation to isolate vulnerable devices from critical assets. 4. Monitor network traffic for unusual requests targeting /goform/openNetworkGateway or suspicious wpapsk_crypto2_4g parameter usage. 5. Apply firmware updates from Tenda as soon as they are released to patch the vulnerability. 6. Employ intrusion detection/prevention systems (IDS/IPS) with signatures for this vulnerability once available. 7. Educate users and administrators about the risks and signs of compromise related to router exploitation. 8. Consider replacing outdated or unsupported devices with models that receive timely security updates. 9. Restrict access to router management interfaces to trusted IP addresses only. 10. Regularly review and update network device configurations to follow security best practices.