CVE-2026-2881 is a stack-based buffer overflow vulnerability identified in the D-Link DWR-M960 router firmware version 1.01.07. The flaw resides in the Advanced Firewall Configuration Endpoint, specifically within the function sub_425FF8 located in the /boafrm/formFirewallAdv component. The vulnerability is triggered by manipulating the submit-url argument, which leads to a stack-based buffer overflow condition. This type of overflow occurs when input data exceeds the buffer's allocated size on the stack, potentially overwriting adjacent memory, including return addresses or control data. Exploiting this vulnerability remotely requires no authentication or user interaction, making it highly accessible to attackers. Successful exploitation could allow remote code execution, enabling attackers to gain control over the device, disrupt firewall configurations, or cause denial of service. The CVSS v4.0 score of 8.7 reflects the high impact on confidentiality, integrity, and availability, combined with low attack complexity and no prerequisites. Although no known exploits are currently active in the wild, the public disclosure of the vulnerability increases the likelihood of future exploitation attempts. The absence of an official patch at the time of disclosure necessitates immediate mitigation efforts by affected users. This vulnerability highlights the risks associated with embedded device firmware and the critical need for secure input validation in network infrastructure components.

The impact of CVE-2026-2881 is significant for organizations relying on the D-Link DWR-M960 router. Exploitation can lead to remote code execution, allowing attackers to take full control of the device, manipulate firewall settings, intercept or redirect network traffic, and potentially pivot to internal networks. This compromises the confidentiality of sensitive data, the integrity of network configurations, and the availability of network services. Given the router's role in managing firewall rules, an attacker could disable security controls, facilitating further attacks or data exfiltration. The vulnerability's remote and unauthenticated nature increases the attack surface, making it a critical risk for enterprises, ISPs, and home users. Additionally, disruption of network availability could impact business continuity and critical communications. The public disclosure without an immediate patch raises the risk of exploitation by opportunistic attackers or advanced persistent threats targeting vulnerable networks globally.

To mitigate CVE-2026-2881, organizations should first check for and apply any official firmware updates or patches released by D-Link addressing this vulnerability. If no patch is available, implement network-level protections such as restricting access to the router's management interface to trusted IP addresses and disabling remote management features if not required. Employ network segmentation to isolate vulnerable devices from critical infrastructure. Use intrusion detection and prevention systems (IDS/IPS) to monitor and block suspicious traffic targeting the /boafrm/formFirewallAdv endpoint or unusual HTTP requests containing malformed submit-url parameters. Regularly audit router configurations and logs for signs of exploitation attempts. Consider deploying web application firewalls (WAF) or custom rules to detect and block buffer overflow attack patterns. Educate network administrators on the vulnerability and establish incident response plans to quickly address potential compromises. Finally, evaluate the use of alternative, more secure network devices if long-term support for this router is uncertain.