CVE-2026-2958 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_457C5C of the /boafrm/formWsc file, where the argument save_apply is improperly handled, allowing an attacker to overwrite the stack memory. This overflow can be triggered remotely over the network without requiring authentication or user interaction, making it highly exploitable. The buffer overflow can lead to arbitrary code execution, enabling attackers to gain control over the device, disrupt network operations, or pivot into internal networks. The vulnerability has a CVSS 4.0 base score of 8.7, reflecting its high impact on confidentiality, integrity, and availability, combined with ease of exploitation. Although no known exploits are currently active in the wild, the public disclosure of exploit details increases the likelihood of future attacks. The affected device, D-Link DWR-M960, is a 4G LTE router commonly used in various enterprise and consumer environments, making this vulnerability a significant risk for organizations relying on this hardware for network connectivity.

The exploitation of CVE-2026-2958 can have severe consequences for organizations worldwide. Successful attacks can lead to full device compromise, allowing attackers to execute arbitrary code, disrupt network services, intercept or manipulate sensitive data, and potentially use the compromised router as a foothold for further attacks within the internal network. This can result in loss of confidentiality, integrity, and availability of network communications. For enterprises relying on D-Link DWR-M960 routers for critical connectivity, this vulnerability poses a risk to business continuity and data security. Additionally, compromised routers can be leveraged in botnets or as part of larger cyberattack campaigns, amplifying the threat landscape. The remote, unauthenticated nature of the exploit increases the attack surface and urgency for mitigation.

To mitigate CVE-2026-2958, organizations should immediately check for and apply any official firmware updates or patches released by D-Link addressing this vulnerability. In the absence of an official patch, network administrators should restrict remote access to the router’s management interfaces by implementing strict firewall rules and access control lists to limit exposure to trusted IP addresses only. Disabling remote management features, especially those accessible over the internet, can reduce the attack surface. Monitoring network traffic for unusual activity and employing intrusion detection systems capable of identifying exploit attempts targeting this vulnerability is recommended. Additionally, organizations should consider segmenting the network to isolate vulnerable devices and maintain regular backups of router configurations to enable rapid recovery. Finally, replacing affected devices with models that have a stronger security posture may be warranted for high-risk environments.