CVE-2025-15253 is a stack-based buffer overflow vulnerability identified in Tenda M3 routers specifically in firmware version 1.0.0.13(4903). The vulnerability resides in an unspecified function accessed via the /goform/exeCommand endpoint, which processes the cmdinput parameter insecurely. When an attacker sends a specially crafted request containing a malicious cmdinput argument, it triggers a buffer overflow on the stack. This overflow can overwrite critical control data such as return addresses, enabling arbitrary code execution with the privileges of the vulnerable process. The vulnerability is remotely exploitable over the network without requiring authentication or user interaction, making it highly dangerous. 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 or user interaction needed. Although no active exploitation in the wild has been reported, the public disclosure of exploit details increases the likelihood of attacks. The vulnerability affects only the specified firmware version, and no official patches or mitigation links have been provided yet, emphasizing the need for immediate defensive measures. This flaw could allow attackers to take full control of the router, intercept or manipulate network traffic, and pivot into internal networks.

The impact of CVE-2025-15253 on organizations worldwide is significant due to the critical role routers play in network security and connectivity. Successful exploitation can lead to remote code execution, allowing attackers to gain unauthorized control over the Tenda M3 routers. This can result in interception or manipulation of sensitive data, disruption of network services, and potential lateral movement within corporate or home networks. Compromised routers can be used as a foothold for launching further attacks, including man-in-the-middle attacks, data exfiltration, or deploying malware. Given the router’s position at the network perimeter, this vulnerability threatens the confidentiality, integrity, and availability of organizational networks. Enterprises relying on Tenda M3 devices, especially those without network segmentation or additional security controls, face elevated risks of network compromise and operational disruption. The absence of patches increases exposure time, and the public availability of exploit code may accelerate attack attempts.

To mitigate CVE-2025-15253, organizations should first verify if they are using Tenda M3 routers with firmware version 1.0.0.13(4903). If so, immediate steps include isolating these devices from untrusted networks and restricting access to the /goform/exeCommand endpoint via firewall rules or access control lists to prevent remote exploitation. Network segmentation should be enforced to limit the impact of a compromised router. Monitoring network traffic for unusual activity or signs of exploitation attempts targeting this endpoint is recommended. Since no official patches are currently available, contacting Tenda support for firmware updates or advisories is critical. As a longer-term measure, consider replacing vulnerable devices with models that receive timely security updates. Additionally, implement network intrusion detection/prevention systems (IDS/IPS) with signatures for this vulnerability once available. Regularly auditing router configurations and disabling unnecessary services can reduce the attack surface. Finally, educating network administrators about this vulnerability and ensuring incident response plans include router compromise scenarios will improve organizational readiness.