CVE-2025-71024 is a stack overflow vulnerability identified in the Tenda AX-3 router firmware version 16.03.12.10_CN. The flaw exists in the handling of the serviceName2 parameter within the fromAdvSetMacMtuWan function. A stack overflow occurs when the input to this parameter is improperly validated, allowing an attacker to overwrite the call stack. This can lead to a Denial of Service (DoS) condition by crashing the router or causing it to become unresponsive. The vulnerability can be triggered remotely by sending a specially crafted request to the affected service, which likely listens on a network-exposed interface. No authentication or user interaction is required to exploit this vulnerability, increasing its risk profile. Although no public exploits have been reported yet, the nature of stack overflow vulnerabilities makes them attractive targets for attackers aiming to disrupt network availability. The lack of a CVSS score suggests the vulnerability is newly disclosed and pending further analysis. The affected firmware version is specific to the Chinese market variant (indicated by _CN), but similar firmware versions may be deployed in other regions, including Europe, due to global distribution of Tenda devices. The vulnerability primarily impacts the availability of the router, potentially causing network outages or degraded performance for connected users.

For European organizations, this vulnerability poses a risk to network availability and reliability. Tenda AX-3 routers are commonly used in small to medium-sized enterprises and home office environments, where network infrastructure may lack robust redundancy. Exploitation could result in temporary loss of internet connectivity, disruption of business operations, and increased support costs. In critical environments, such as healthcare or financial services, even short outages can have significant operational and reputational consequences. Additionally, denial of service conditions may be leveraged as part of multi-stage attacks to distract or disable network defenses. The absence of known exploits reduces immediate risk but does not eliminate the threat, as attackers may develop exploits following public disclosure. European organizations with exposed router management interfaces or weak network segmentation are particularly vulnerable. The impact is primarily on availability, with no direct indication of confidentiality or integrity compromise from this vulnerability alone.

1. Monitor Tenda’s official channels for firmware updates addressing CVE-2025-71024 and apply patches promptly once available. 2. Restrict access to router management interfaces by implementing network segmentation and firewall rules to limit exposure to trusted IP addresses only. 3. Disable remote management features if not required, or enforce strong authentication and encrypted management protocols. 4. Deploy network intrusion detection/prevention systems (IDS/IPS) capable of identifying and blocking malformed packets or anomalous requests targeting the vulnerable function. 5. Conduct regular network traffic analysis to detect unusual patterns that may indicate exploitation attempts. 6. Educate IT staff about this vulnerability to ensure rapid response and incident handling. 7. Consider replacing or upgrading networking hardware if vendor support or patch availability is limited. 8. Implement redundancy and failover mechanisms to mitigate the impact of potential router outages.