CVE-2025-50258 is a buffer overflow vulnerability identified in the Tenda AC6 router firmware version v15.03.05.16_multi. The vulnerability exists in the SetSysTimeCfg function, which processes the 'time' parameter. A buffer overflow occurs when the input data exceeds the allocated buffer size, potentially allowing an attacker to overwrite adjacent memory. This can lead to arbitrary code execution, denial of service, or system instability. Since the vulnerability is in a function related to system time configuration, it is likely accessible via the router's management interface or possibly through network requests that manipulate system time settings. The absence of a CVSS score and lack of known exploits in the wild suggest this vulnerability is newly disclosed and not yet actively exploited. However, buffer overflow vulnerabilities in network devices like routers are critical because they can be exploited remotely without authentication if the vulnerable function is exposed externally. The lack of patch information indicates that a fix may not yet be available, increasing the urgency for mitigation. The vulnerability affects a specific firmware version of the Tenda AC6 router, a consumer-grade device widely used for home and small office networking.

For European organizations, the impact of this vulnerability can be significant, especially for small and medium enterprises (SMEs) and home office users relying on Tenda AC6 routers for network connectivity. Exploitation could allow attackers to gain unauthorized access to the router, manipulate network traffic, intercept sensitive communications, or launch further attacks on internal networks. This could compromise confidentiality, integrity, and availability of organizational data and services. Additionally, compromised routers can be used as entry points for lateral movement or as part of botnets for distributed denial-of-service (DDoS) attacks. The impact is heightened in environments where network segmentation and monitoring are weak. Since many European organizations use consumer-grade routers due to cost constraints, the risk of widespread exploitation is non-negligible. Moreover, the lack of patches and public exploits may lead to zero-day exploitation attempts targeting vulnerable devices.

1. Immediate mitigation should include isolating the Tenda AC6 routers from untrusted networks and disabling remote management interfaces if enabled. 2. Network administrators should monitor network traffic for unusual activity that could indicate exploitation attempts, such as unexpected time configuration requests or anomalous packets targeting the router. 3. Organizations should implement network segmentation to limit the exposure of vulnerable devices to critical infrastructure. 4. Regularly check for firmware updates from Tenda and apply them promptly once available. 5. If possible, replace vulnerable Tenda AC6 devices with routers from vendors with strong security track records and active patch management. 6. Employ intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics capable of detecting buffer overflow attempts targeting router management functions. 7. Educate users and IT staff about the risks of using outdated firmware and the importance of secure router configurations. 8. Consider deploying network access controls to restrict which devices can communicate with the router's management interface.