CVE-2026-2883 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 function sub_427D74, located in the /boafrm/formIpQoS file, which handles Quality of Service (QoS) IP configuration submissions. Specifically, the vulnerability arises from improper handling of the 'submit-url' argument, which an attacker can manipulate to overflow the stack buffer. This overflow can overwrite critical memory regions, potentially allowing remote code execution or denial of service. The vulnerability can be exploited remotely over the network without requiring authentication or user interaction, making it highly accessible to attackers. The CVSS 4.0 base score is 8.7, reflecting high impact on confidentiality, integrity, and availability, with low attack complexity and no privileges or user interaction needed. Although no known exploits are currently active in the wild, the public disclosure of the vulnerability details increases the likelihood of exploitation attempts. The affected device is primarily used as a 5G Wi-Fi router, often deployed in small to medium business and home environments. The lack of an official patch or update link in the provided information suggests that mitigation relies on network-level controls and vendor advisories. This vulnerability poses a significant risk as successful exploitation could allow attackers to gain control over the device, intercept or manipulate network traffic, and pivot into internal networks.

The impact of CVE-2026-2883 is substantial for organizations and individuals using the D-Link DWR-M960 router. Successful exploitation can lead to remote code execution, enabling attackers to take full control of the device. This compromises the confidentiality of network traffic, as attackers could intercept or redirect data. Integrity is affected as attackers may alter router configurations or inject malicious payloads into the network. Availability can be disrupted through denial-of-service conditions caused by the buffer overflow. For organizations, this could mean loss of network connectivity, exposure of sensitive data, and a foothold for further lateral movement within corporate networks. The vulnerability's remote and unauthenticated exploitability increases the risk of widespread attacks, especially in environments where these routers are exposed to the internet. The absence of known exploits in the wild currently limits immediate impact, but the public disclosure and high CVSS score indicate a critical need for proactive defense. The threat is particularly relevant for sectors relying on these routers for critical communications, including small businesses, remote offices, and home users who may lack robust security monitoring.

To mitigate CVE-2026-2883, organizations should first verify if their D-Link DWR-M960 devices are running firmware version 1.01.07 and prioritize upgrading to a patched firmware version once released by D-Link. In the absence of an official patch, administrators should restrict remote management access by disabling WAN-side access to the router’s web interface and limiting management to trusted internal networks only. Implement network segmentation to isolate vulnerable devices from critical infrastructure. Employ intrusion detection and prevention systems (IDS/IPS) to monitor for anomalous traffic patterns targeting the /boafrm/formIpQoS endpoint or unusual HTTP POST requests containing suspicious 'submit-url' parameters. Regularly audit router configurations and logs for signs of compromise. Additionally, consider deploying web application firewalls (WAF) or reverse proxies that can filter and sanitize incoming requests to the router’s management interface. Educate users about the risks of exposing router management interfaces to the internet and encourage strong administrative passwords. Finally, maintain an active threat intelligence program to stay informed about any emerging exploits or patches related to this vulnerability.