CVE-2025-63932 is a remote code execution (RCE) vulnerability identified in the D-Link DIR-868L A1 router firmware version FW106KRb01.bin. The root cause lies in the cgibin binary, specifically within the Home Network Administration Protocol (HNAP) service it provides. The vulnerability arises because the HNAP service does not properly filter or sanitize the HTTP SOAPAction header field. An unauthenticated remote attacker can craft a malicious HTTP request with a specially crafted SOAPAction header that injects shell commands. Due to the lack of authentication and user interaction requirements, the attacker can execute arbitrary commands on the underlying operating system with the privileges of the cgibin process, potentially leading to full device compromise. This vulnerability is categorized under CWE-78 (Improper Neutralization of Special Elements used in an OS Command), indicating command injection. The CVSS v3.1 base score is 7.3, with vector AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L, reflecting network attack vector, low attack complexity, no privileges or user interaction required, and impacts on confidentiality, integrity, and availability. No patches or exploits are currently publicly available, but the vulnerability's nature makes it a critical risk for affected devices. The vulnerability was reserved on 2025-10-27 and published on 2025-11-19.

For European organizations, this vulnerability poses a significant risk, especially for small and medium enterprises (SMEs) and home office environments where the D-Link DIR-868L router is deployed. Successful exploitation can lead to unauthorized remote control of the router, enabling attackers to intercept or manipulate network traffic, deploy malware, pivot into internal networks, or cause denial of service by disrupting router functionality. Confidentiality is at risk due to potential data interception or exfiltration; integrity can be compromised by altering network configurations or injecting malicious payloads; availability may be affected by crashing or disabling the device. Given the router's role as a network gateway, exploitation can undermine the security posture of entire organizational networks. The lack of authentication and user interaction requirements increases the likelihood of automated exploitation attempts. This threat is particularly concerning for organizations relying on this router model without additional network segmentation or monitoring controls.

1. Immediate mitigation involves isolating affected D-Link DIR-868L routers from untrusted networks and restricting access to the HNAP service, ideally by firewall rules blocking inbound HTTP requests targeting the cgibin endpoint. 2. Monitor network traffic for unusual SOAPAction headers or unexpected HTTP requests to the router's management interface. 3. Disable the HNAP service if possible via router configuration to reduce the attack surface until a firmware update is available. 4. Engage with D-Link support channels to obtain official firmware patches or updates addressing this vulnerability. 5. For organizations unable to update immediately, deploy network intrusion detection/prevention systems (IDS/IPS) with custom signatures to detect and block exploitation attempts targeting the SOAPAction header. 6. Educate IT staff about this vulnerability to ensure rapid response and incident handling. 7. Consider replacing affected routers with models that have verified security updates if patching is delayed or unsupported.