CVE-2026-2881 is a stack-based buffer overflow vulnerability identified in the D-Link DWR-M960 router firmware version 1.01.07. The vulnerability resides in the Advanced Firewall Configuration Endpoint component, specifically in the function sub_425FF8 located in the /boafrm/formFirewallAdv file. The issue arises due to improper validation and handling of the submit-url parameter, which an attacker can manipulate to overflow the stack buffer. This overflow can corrupt the execution stack, potentially allowing an attacker to execute arbitrary code with the privileges of the affected process. The vulnerability is remotely exploitable without requiring authentication or user interaction, making it highly dangerous. The CVSS v4.0 score is 8.7 (high), reflecting the ease of exploitation (network attack vector, low complexity), no privileges required, and no user interaction needed, combined with high impact on confidentiality, integrity, and availability. While no exploits are currently reported in the wild, the public disclosure of exploit details increases the likelihood of active exploitation attempts. The affected device is primarily used as a 4G LTE router, often deployed in enterprise and small-to-medium business environments, as well as by consumers in regions with limited wired broadband. The vulnerability could allow attackers to take control of the device, disrupt network traffic, or pivot into internal networks.

The impact of CVE-2026-2881 is significant for organizations using the D-Link DWR-M960 router, especially those exposing the device's management interface to the internet or untrusted networks. Successful exploitation can lead to arbitrary code execution with elevated privileges, enabling attackers to take full control of the router. This can result in interception or manipulation of network traffic, disruption of network availability, and potential lateral movement into internal networks. Confidential information passing through the router could be compromised, and attackers could install persistent backdoors or malware. Given the router's role as a network gateway, the compromise could affect entire organizational networks, leading to operational downtime, data breaches, and reputational damage. The lack of required authentication and user interaction lowers the barrier for attackers, increasing the risk of automated exploitation campaigns. Organizations relying on this device for critical connectivity, including remote sites or branch offices, are particularly vulnerable.

To mitigate CVE-2026-2881, organizations should immediately check for and apply any firmware updates or patches released by D-Link addressing this vulnerability. If no official patch is available, network administrators should restrict access to the router's management interface by implementing network segmentation and firewall rules that limit access to trusted IP addresses only. Disabling remote management features or changing default management ports can reduce exposure. Monitoring network traffic for unusual activity and deploying intrusion detection/prevention systems tuned to detect exploitation attempts targeting this vulnerability is recommended. Additionally, organizations should consider replacing affected devices with models that have received security updates if patching is not feasible. Regularly auditing device configurations and maintaining an inventory of network devices will help identify and remediate vulnerable equipment promptly. Finally, educating staff about the risks of exposed network devices and enforcing strong network access controls will further reduce exploitation risk.