The vulnerability identified as CVE-2025-57057 affects the Tenda G3 router, specifically version 3.0br_V15.11.0.17. It is a stack overflow vulnerability located in the ipMacBindListStore function, triggered via the listStr parameter. A stack overflow occurs when more data is written to a buffer located on the stack than it can hold, which can overwrite adjacent memory and potentially disrupt normal program execution. In this case, the vulnerability allows an attacker to send a crafted request containing a specially designed listStr parameter that overflows the stack buffer. The primary consequence of this overflow is a Denial of Service (DoS), where the router becomes unresponsive or crashes, disrupting network connectivity. There is no indication that this vulnerability allows for remote code execution or privilege escalation, and no known exploits are currently in the wild. The vulnerability was published on September 9, 2025, with no CVSS score assigned yet. The affected version is specifically Tenda G3 v3.0br_V15.11.0.17, and no patch or mitigation details have been provided at this time. The lack of a CVSS score and exploit code suggests this is a newly discovered vulnerability that may require further analysis and patch development by the vendor.

For European organizations, the impact of this vulnerability primarily involves potential disruption of network services due to router crashes or reboots caused by the DoS attack. Organizations relying on Tenda G3 routers for critical network infrastructure could experience temporary loss of internet connectivity, internal network segmentation, or degraded performance. This could affect business operations, especially for small and medium enterprises or branch offices where Tenda routers are deployed as cost-effective networking solutions. While the vulnerability does not appear to allow data theft or system compromise, the denial of service could be leveraged in targeted attacks to disrupt operations or as part of a larger multi-vector attack. Given the absence of known exploits, the immediate risk is moderate, but the potential for future exploitation exists if attackers develop reliable attack tools. Additionally, unmanaged or poorly monitored networks may be more vulnerable to such disruptions. The impact on confidentiality and integrity is minimal, but availability is significantly affected during an attack.

To mitigate this vulnerability, European organizations using Tenda G3 routers should first verify if their devices run the affected firmware version 3.0br_V15.11.0.17. Since no patches are currently available, organizations should implement network-level protections such as firewall rules to restrict access to the router management interfaces from untrusted networks, especially blocking unsolicited inbound traffic targeting the vulnerable function. Network segmentation can limit exposure by isolating critical devices from general user traffic. Monitoring network traffic for unusual or malformed requests targeting the router's management services can help detect attempted exploitation. Organizations should also maintain regular backups of router configurations and be prepared to reboot or reset devices if a DoS condition occurs. Engaging with Tenda support to obtain firmware updates or security advisories is recommended. Finally, consider deploying intrusion detection/prevention systems (IDS/IPS) that can identify and block malformed packets resembling the crafted requests used in this attack.