CVE-2025-14135 is a stack-based buffer overflow vulnerability identified in several Linksys range extender models (RE6500, RE6250, RE6300, RE6350, RE7000, RE9000) running specific firmware versions (1.0.013.001, 1.0.04.001, 1.0.04.002, 1.1.05.003, 1.2.07.001). The vulnerability resides in the AP_get_wired_clientlist_setClientsName function within the mod_form.so module, where improper validation of the clientsname_0 argument leads to a stack buffer overflow condition. This flaw can be exploited remotely without requiring authentication or user interaction, allowing attackers to potentially execute arbitrary code, cause denial of service, or gain unauthorized access to the device. The vulnerability has a CVSS 4.0 base score of 8.7, reflecting its high severity due to network attack vector, low attack complexity, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability. Despite early notification, Linksys has not issued patches or advisories, and a public exploit is available, increasing the likelihood of exploitation. The affected devices are commonly used as wireless range extenders in enterprise and home networks, making this a significant threat vector for network security. The lack of vendor response and patch availability necessitates immediate defensive actions by users and administrators to mitigate risk.

For European organizations, this vulnerability poses a substantial risk to network security and operational continuity. Exploitation could allow attackers to execute arbitrary code on vulnerable Linksys devices, potentially leading to full device compromise. This may enable attackers to intercept or manipulate network traffic, pivot to internal systems, disrupt wireless connectivity, or launch further attacks within the network. Confidentiality of sensitive data could be compromised, integrity of network operations undermined, and availability of wireless services disrupted. Given the widespread use of Linksys range extenders in both enterprise and residential environments across Europe, the vulnerability could facilitate large-scale attacks or targeted intrusions, especially against organizations relying on these devices for network extension or remote access. The absence of patches and vendor engagement increases the window of exposure, elevating the threat level. Critical sectors such as finance, government, healthcare, and telecommunications that depend on reliable and secure wireless infrastructure are particularly vulnerable to operational and reputational damage.

1. Immediately identify and inventory all affected Linksys devices within the network environment. 2. Disable remote management interfaces and any unnecessary network services on vulnerable devices to reduce attack surface. 3. Segment vulnerable devices on isolated network segments or VLANs to limit potential lateral movement by attackers. 4. Implement strict firewall rules to restrict inbound and outbound traffic to and from these devices, especially from untrusted networks. 5. Monitor network traffic and device logs for signs of exploitation attempts or anomalous behavior related to the clientsname_0 parameter or mod_form.so module. 6. Employ intrusion detection/prevention systems (IDS/IPS) with updated signatures to detect known exploit patterns. 7. Engage with Linksys support channels regularly to obtain updates or patches as they become available. 8. Consider replacing vulnerable devices with alternative hardware from vendors with active security support if patching is not forthcoming. 9. Educate network administrators about the vulnerability and recommended defensive measures. 10. Maintain up-to-date backups and incident response plans to rapidly recover from potential compromise.