CVE-2025-12618 is a buffer overflow vulnerability identified in the Tenda AC8 router firmware version 16.03.34.06. The flaw exists in an unspecified function related to the /goform/DatabaseIniSet endpoint, where manipulation of the 'Time' parameter leads to a buffer overflow condition. This vulnerability can be exploited remotely without requiring authentication or user interaction, making it highly accessible to attackers. The buffer overflow could allow attackers to execute arbitrary code on the device, potentially gaining full control over the router or causing a denial of service by crashing the device. The CVSS v4.0 score of 8.7 reflects the high impact on confidentiality, integrity, and availability, combined with low attack complexity and no prerequisites such as privileges or user interaction. Although no confirmed exploits are currently active in the wild, the public disclosure of exploit code increases the likelihood of imminent attacks. The vulnerability affects a widely deployed consumer and small business router model, which is often used as a gateway device in home and office networks. Successful exploitation could enable attackers to intercept or manipulate network traffic, pivot into internal networks, or disrupt internet connectivity. The lack of available patches at the time of disclosure necessitates immediate defensive measures to mitigate risk.

For European organizations, the impact of CVE-2025-12618 is significant due to the critical role routers play in network security and connectivity. Exploitation could lead to unauthorized access to internal networks, interception of sensitive communications, and disruption of business operations through denial of service. Small and medium enterprises (SMEs) and home offices relying on Tenda AC8 devices are particularly vulnerable, as these devices often lack advanced security monitoring. The compromise of such routers could serve as a foothold for further attacks against corporate networks or critical infrastructure. Additionally, the potential for remote code execution elevates the risk of persistent threats and data breaches. The absence of patches at disclosure time increases exposure, and the public availability of exploit code accelerates the threat landscape. Organizations in sectors such as finance, healthcare, and government, which require stringent network security, may face heightened risks if these devices are present in their environments.

1. Immediately verify if Tenda AC8 routers running firmware version 16.03.34.06 are in use within the network and isolate them if possible. 2. Monitor vendor communications closely for firmware updates or patches addressing CVE-2025-12618 and apply them promptly upon release. 3. Implement network segmentation to limit exposure of vulnerable devices, restricting access to management interfaces from untrusted networks. 4. Deploy network intrusion detection and prevention systems (IDS/IPS) with signatures tuned to detect anomalous requests targeting /goform/DatabaseIniSet or unusual buffer overflow attempts. 5. Restrict remote management access to trusted IP addresses and disable any unnecessary remote administration features on affected routers. 6. Conduct regular network traffic analysis to identify suspicious activities indicative of exploitation attempts. 7. Educate IT staff and users about the risks associated with this vulnerability and encourage reporting of unusual device behavior. 8. Consider replacing vulnerable devices with models that have a proven security track record if patches are delayed or unavailable.