CVE-2025-69765 is a security vulnerability identified in the Tenda AX3 router firmware version 16.03.12.11. The issue arises from a stack overflow in the formGetIptv function, specifically involving the 'list' parameter. A stack overflow occurs when a program writes more data to a buffer located on the stack than it can hold, which can overwrite adjacent memory and corrupt program execution flow. In this case, the overflow can lead to memory corruption, which attackers can exploit to execute arbitrary code remotely on the affected device. This vulnerability does not require authentication, meaning an attacker can exploit it without prior access or credentials, increasing its risk profile. The vulnerability was reserved in January 2026 and published in March 2026, but no public exploits have been reported yet. The lack of a CVSS score indicates that the vulnerability is newly disclosed and pending further assessment. The affected product, Tenda AX3, is a popular consumer-grade Wi-Fi 6 router, widely used in home and small office environments. The formGetIptv function likely relates to IPTV service configuration, and improper input validation on the 'list' parameter leads to this critical memory corruption flaw. Exploiting this vulnerability could allow attackers to gain full control over the router, manipulate network traffic, install malware, or pivot to internal networks.

The potential impact of CVE-2025-69765 is significant for organizations and individuals using Tenda AX3 routers. Successful exploitation can result in remote code execution, allowing attackers to take full control of the device. This compromises the confidentiality, integrity, and availability of network communications passing through the router. Attackers could intercept sensitive data, redirect traffic to malicious sites, or launch further attacks against internal network resources. For enterprises relying on these routers in branch offices or remote locations, this could lead to network breaches and data exfiltration. The vulnerability's remote and unauthenticated nature makes it easier to exploit, increasing the likelihood of attacks once exploit code becomes available. Although no exploits are currently known in the wild, the widespread use of Tenda AX3 devices and the critical nature of the flaw make it a high-risk issue. Additionally, compromised routers can be recruited into botnets, amplifying threats to broader internet infrastructure.

To mitigate CVE-2025-69765, organizations should first monitor Tenda's official channels for firmware updates addressing this vulnerability and apply patches promptly once available. Until patches are released, network administrators should consider disabling IPTV features on the router if not in use, as this may reduce the attack surface related to the vulnerable function. Implement network segmentation to isolate vulnerable routers from critical internal systems, limiting potential lateral movement by attackers. Employ intrusion detection and prevention systems (IDS/IPS) to monitor for anomalous traffic patterns or exploitation attempts targeting the router. Regularly audit router configurations and firmware versions to ensure devices are up to date and securely configured. For high-security environments, consider replacing vulnerable consumer-grade routers with enterprise-grade devices that receive timely security updates. Educate users about the risks of connecting untrusted devices to the network and encourage strong network access controls. Finally, maintain comprehensive network monitoring and logging to detect early signs of compromise.