CVE-2026-2926 is a stack-based buffer overflow vulnerability identified in the D-Link DWR-M960 router, specifically version 1.01.07. The vulnerability resides in the LTE Configuration Endpoint component, within the function sub_4237AC of the /boafrm/formLteSetup file. An attacker can exploit this flaw by manipulating the 'submit-url' argument, which leads to a stack buffer overflow condition. This overflow can corrupt the stack, potentially allowing arbitrary code execution with elevated privileges on the device. The vulnerability is remotely exploitable without requiring authentication or user interaction, making it particularly severe. The CVSS 4.0 base score is 8.7, indicating high severity, with attack vector being network-based and low attack complexity. The vulnerability affects the confidentiality, integrity, and availability of the device, as an attacker could execute malicious code, disrupt device operation, or intercept sensitive data. Although no confirmed exploits in the wild have been reported, a proof-of-concept exploit is publicly available, increasing the likelihood of exploitation. The DWR-M960 is a 4G LTE router used in various enterprise and consumer environments, often deployed in regions relying on LTE connectivity for internet access. The lack of vendor patches or official mitigation guidance at the time of disclosure increases the urgency for organizations to implement interim protective measures.

The impact of CVE-2026-2926 is significant for organizations using the D-Link DWR-M960 router, especially in environments where LTE connectivity is critical. Exploitation can lead to full device compromise, allowing attackers to execute arbitrary code with elevated privileges. This can result in unauthorized access to internal networks, interception or manipulation of sensitive data, disruption of network services, and potential pivoting to other internal systems. Given the device’s role as a network gateway, compromise could undermine the security posture of entire organizational networks. The remote and unauthenticated nature of the exploit increases the risk of widespread attacks, particularly in sectors relying on LTE routers for remote or branch office connectivity. The availability of a public exploit further elevates the threat, as less skilled attackers may leverage it to conduct attacks. Organizations in critical infrastructure, telecommunications, and enterprises with remote LTE deployments face heightened risk of operational disruption and data breaches.

1. Immediate mitigation should focus on isolating affected DWR-M960 devices from untrusted networks to reduce exposure to remote attacks. 2. Monitor network traffic for unusual requests targeting the /boafrm/formLteSetup endpoint, particularly those manipulating the submit-url parameter. 3. Employ network-based intrusion detection/prevention systems (IDS/IPS) with custom signatures to detect and block exploit attempts. 4. Restrict management interfaces to trusted IP addresses and disable remote management if not required. 5. Regularly audit and update device firmware; coordinate with D-Link for official patches or security advisories addressing this vulnerability. 6. If patching is not immediately available, consider deploying compensating controls such as web application firewalls (WAF) to filter malicious payloads targeting the vulnerable endpoint. 7. Conduct thorough incident response readiness and network segmentation to limit lateral movement in case of compromise. 8. Educate network administrators about the vulnerability and signs of exploitation to ensure rapid detection and response.