CVE-2025-57057 is a high-severity vulnerability affecting the Tenda G3 router firmware version 3.0br_V15.11.0.17. The vulnerability arises from a stack-based buffer overflow in the ipMacBindListStore function, specifically related to the handling of the listStr parameter. An attacker can exploit this flaw by sending a specially crafted request to the affected device, triggering a stack overflow condition. This overflow can cause the device to crash or become unresponsive, resulting in a Denial of Service (DoS) condition. The vulnerability does not require any authentication or user interaction, and can be exploited remotely over the network (CVSS vector: AV:N/AC:L/PR:N/UI:N). The flaw is categorized under CWE-121, which corresponds to a classic stack-based buffer overflow, a well-known and dangerous class of vulnerabilities that can lead to memory corruption and service disruption. Although no known exploits are currently reported in the wild, the ease of exploitation and the lack of required privileges make this a significant risk for affected devices. No patches or mitigation updates have been published yet, increasing the urgency for affected users to apply any forthcoming updates or implement network-level protections.

For European organizations, this vulnerability poses a significant risk to network infrastructure relying on Tenda G3 routers. The DoS condition can disrupt internet connectivity, internal communications, and critical business operations, especially in small and medium enterprises or branch offices where such consumer-grade routers are commonly deployed. The lack of confidentiality or integrity impact reduces the risk of data theft or manipulation; however, the availability impact alone can cause operational downtime, loss of productivity, and potential financial losses. In sectors such as healthcare, finance, or critical infrastructure, even temporary network outages can have severe consequences. Additionally, the vulnerability could be leveraged as part of a larger attack chain or to create network instability during targeted campaigns. European organizations with remote or distributed networks using these devices are particularly vulnerable due to the remote exploitability and no authentication requirement.

Given the absence of an official patch, European organizations should immediately audit their network environments to identify the presence of Tenda G3 routers running the vulnerable firmware version 3.0br_V15.11.0.17. Network segmentation should be enforced to isolate these devices from critical systems and sensitive data. Implementing strict firewall rules to restrict access to router management interfaces from untrusted networks can reduce exposure. Intrusion detection/prevention systems (IDS/IPS) should be configured to monitor and block suspicious traffic patterns targeting the ipMacBindListStore function or unusual requests to the router. Organizations should also consider replacing vulnerable devices with models from vendors that provide timely security updates and have a strong security track record. Until a patch is released, disabling remote management features and limiting administrative access to trusted internal networks can mitigate exploitation risks. Regular monitoring of vendor advisories and CVE databases is essential to apply patches promptly once available.