CVE-2025-12619 is a remote buffer overflow vulnerability identified in the Tenda A15 router firmware version 15.13.07.13. The issue resides in the fromSetWirelessRepeat function, specifically in the handling of the wpapsk_crypto2_4g parameter within the /goform/openNetworkGateway endpoint. Improper validation or sanitization of this argument allows an attacker to overflow a buffer, potentially overwriting adjacent memory. This can lead to arbitrary code execution or cause the device to crash, resulting in denial of service. The vulnerability is remotely exploitable without authentication or user interaction, making it highly accessible to attackers scanning for vulnerable devices. The CVSS 4.0 base score is 8.7, reflecting high impact on confidentiality, integrity, and availability, with low attack complexity and no privileges required. Although no active exploitation has been reported, a public exploit is available, increasing the likelihood of future attacks. The affected product, Tenda A15, is a popular consumer router model used worldwide, often in home and small office environments. The lack of an official patch at the time of disclosure necessitates immediate mitigation efforts to prevent exploitation.

The vulnerability poses significant risks to organizations and individuals using the Tenda A15 router. Successful exploitation can lead to full compromise of the device, allowing attackers to execute arbitrary code, intercept or manipulate network traffic, disrupt network availability, or pivot to internal networks. This undermines the confidentiality, integrity, and availability of network communications and connected devices. For enterprises relying on these routers in branch offices or remote sites, the impact includes potential data breaches, operational disruptions, and increased attack surface for lateral movement. The ease of remote exploitation without authentication amplifies the threat, enabling widespread scanning and targeting by malicious actors. The public availability of an exploit increases the urgency for mitigation. Failure to address this vulnerability could result in significant security incidents, including espionage, ransomware deployment, or service outages.

1. Immediate mitigation should focus on isolating affected Tenda A15 devices from untrusted networks, especially the internet, to reduce exposure. 2. Network administrators should implement strict firewall rules to block access to the /goform/openNetworkGateway endpoint or restrict access to trusted IP addresses only. 3. Monitor network traffic for unusual requests targeting the wpapsk_crypto2_4g parameter or signs of buffer overflow exploitation attempts. 4. If possible, disable remote management features on the router to limit attack vectors. 5. Regularly check for official firmware updates or patches from Tenda addressing this vulnerability and apply them promptly once available. 6. Consider replacing vulnerable devices with models from vendors with stronger security track records if patches are delayed. 7. Employ network segmentation to limit the impact of a compromised router on critical internal systems. 8. Conduct vulnerability scans and penetration tests to identify and remediate exposure. 9. Educate users about the risks of using outdated router firmware and encourage timely updates.