CVE-2026-2884 is a stack-based buffer overflow vulnerability identified in the D-Link DWR-M960 router firmware version 1.01.07. The flaw exists in the WAN Interface Setting Handler component, specifically in the function sub_41914C located in the /boafrm/formWanConfigSetup file. The vulnerability is triggered by manipulating the 'submit-url' parameter, which is improperly validated or sanitized, leading to a buffer overflow on the stack. This overflow can corrupt the execution stack, allowing an attacker to overwrite return addresses or control data, potentially enabling arbitrary code execution or causing a denial of service condition. The attack vector is remote network access, requiring no authentication or user interaction, making exploitation feasible over the internet or local networks. The vulnerability has been assigned a CVSS 4.0 base score of 8.7, indicating high severity with high impact on confidentiality, integrity, and availability. Although no confirmed exploits are currently active in the wild, publicly available proof-of-concept code increases the likelihood of future exploitation. The affected product is a widely used 4G LTE router model by D-Link, commonly deployed in enterprise and consumer environments for WAN connectivity. The lack of official patches or mitigations at the time of disclosure necessitates immediate defensive measures by administrators to reduce exposure.

Successful exploitation of CVE-2026-2884 can have severe consequences for affected organizations. An attacker could remotely execute arbitrary code with elevated privileges on the router, potentially gaining full control over the device. This control could be leveraged to intercept, modify, or redirect network traffic, compromising confidentiality and integrity of data traversing the router. Additionally, attackers could disrupt network availability by causing crashes or persistent denial of service. Compromise of WAN interface settings could allow attackers to establish persistent backdoors or pivot into internal networks, escalating the scope of the breach. Given the router's role as a gateway device, exploitation could impact multiple connected systems and users, amplifying the damage. Organizations relying on D-Link DWR-M960 devices for critical connectivity, including enterprises, service providers, and government agencies, face increased risk of espionage, data theft, service disruption, and lateral movement by threat actors.

To mitigate CVE-2026-2884, organizations should immediately verify if they are running the affected firmware version 1.01.07 on D-Link DWR-M960 devices. If an official patch or firmware update is released by D-Link, it should be applied promptly to remediate the vulnerability. In the absence of an official patch, administrators should restrict remote access to the router’s management interfaces by implementing network segmentation, firewall rules, and VPN access controls to limit exposure to trusted networks only. Disabling WAN interface configuration via the web interface or restricting access to trusted IP addresses can reduce attack surface. Monitoring router logs and network traffic for anomalous activity related to the 'submit-url' parameter or unexpected configuration changes is recommended. Employing intrusion detection/prevention systems with signatures targeting this vulnerability can help detect exploitation attempts. Regularly auditing and updating router firmware and configurations as part of a comprehensive network security program is essential to prevent exploitation of similar vulnerabilities.