CVE-2025-7597 is a critical stack-based buffer overflow vulnerability identified in the Tenda AX1803 router, specifically affecting firmware version 1.0.0.1. The flaw resides in the function formSetMacFilterCfg within the /goform/setMacFilterCfg endpoint. This function processes the deviceList argument, and improper handling of this input leads to a stack-based buffer overflow condition. Because this vulnerability can be triggered remotely without authentication or user interaction, an attacker can exploit it over the network by sending a specially crafted request to the vulnerable endpoint. Successful exploitation could allow an attacker to execute arbitrary code on the device with elevated privileges, potentially leading to full compromise of the router. The disclosed exploit code increases the risk of active exploitation, although no confirmed widespread attacks have been reported yet. The CVSS 4.0 score of 8.7 (high severity) reflects the vulnerability's network attack vector, low attack complexity, and the absence of required privileges or user interaction. The impact on confidentiality, integrity, and availability is high, as attackers could manipulate network traffic, disrupt connectivity, or use the compromised device as a foothold for further attacks within the network. The vulnerability affects a specific firmware version, indicating that upgrading or patching is critical to mitigate the risk. However, no official patches or updates have been linked or published at this time, increasing the urgency for users and administrators to apply interim mitigations or consider device replacement if necessary.

For European organizations, the exploitation of CVE-2025-7597 could have significant consequences. Many enterprises and small-to-medium businesses rely on Tenda routers like the AX1803 for network connectivity, especially in branch offices or remote locations. A compromised router could lead to interception or manipulation of sensitive data, disruption of business operations due to network outages, and the establishment of persistent backdoors for further intrusion into corporate networks. Given the router's role as a network gateway, attackers could pivot to internal systems, increasing the risk of data breaches or ransomware attacks. Critical infrastructure providers, healthcare, finance, and government entities in Europe could be particularly vulnerable if they use affected devices, as these sectors are frequent targets of cyberattacks. The remote and unauthenticated nature of the exploit lowers the barrier for attackers, including cybercriminals and state-sponsored actors, to leverage this vulnerability at scale. The public disclosure of exploit code further elevates the threat landscape, necessitating immediate attention to prevent exploitation.

1. Immediate identification and inventory of all Tenda AX1803 devices running firmware version 1.0.0.1 within the organization's network. 2. Monitor vendor communications and security advisories for official patches or firmware updates addressing CVE-2025-7597 and apply them promptly once available. 3. Until patches are released, restrict access to the router's management interface by implementing network segmentation and firewall rules to limit exposure to trusted IP addresses only. 4. Disable remote management features if not strictly necessary to reduce the attack surface. 5. Employ network intrusion detection/prevention systems (IDS/IPS) with updated signatures to detect and block exploit attempts targeting the /goform/setMacFilterCfg endpoint. 6. Conduct regular network traffic analysis to identify anomalous requests or patterns indicative of exploitation attempts. 7. Consider replacing vulnerable devices with alternative models or vendors if patching is not feasible within a reasonable timeframe. 8. Educate IT staff about the vulnerability and ensure incident response plans include steps for handling potential exploitation scenarios related to this vulnerability.