CVE-2024-0769 is a path traversal vulnerability identified in the D-Link DIR-859 router firmware version 1.06B01. The vulnerability exists in the HTTP POST request handler component, specifically in the /hedwig.cgi endpoint. An attacker can manipulate the 'service' argument by injecting a path traversal payload such as '../../../../htdocs/webinc/getcfg/DHCPS6.BRIDGE-1.xml', which allows unauthorized reading of arbitrary files on the device's filesystem. This occurs due to insufficient sanitization of user-supplied input, enabling traversal outside the intended directory scope. The vulnerability requires no authentication or user interaction and can be exploited remotely over the network. The CVSS v3.1 base score is 5.3 (medium), reflecting the vulnerability's impact on confidentiality only, with no effect on integrity or availability. The vendor has confirmed that the DIR-859 product is end-of-life, and no patches are available. The exploit details have been publicly disclosed, increasing the risk of exploitation, although no active exploitation has been reported. This vulnerability is classified under CWE-22 (Improper Limitation of a Pathname to a Restricted Directory).

For European organizations, the primary impact is unauthorized disclosure of sensitive configuration files or other data stored on the affected router. This could lead to exposure of network configuration details, potentially aiding further attacks such as network reconnaissance or targeted exploitation. Since the vulnerability does not affect integrity or availability, it does not directly enable device takeover or denial of service. However, the confidentiality breach could compromise network security posture. Organizations relying on the DIR-859 routers, especially in critical infrastructure or sensitive environments, face increased risk if these devices remain in use. The lack of vendor support and patches exacerbates the threat, as mitigation options are limited to device replacement or network segmentation. The public disclosure of the exploit code increases the likelihood of opportunistic attacks, particularly from less sophisticated threat actors.

Given the product is end-of-life and no patches are available, the primary mitigation is to retire and replace all affected D-Link DIR-859 devices with supported models that receive security updates. Until replacement, organizations should implement strict network segmentation to isolate these routers from sensitive internal networks. Restrict management interface access to trusted IP addresses and disable remote management if enabled. Monitor network traffic for unusual HTTP POST requests targeting /hedwig.cgi or attempts to exploit path traversal patterns. Employ intrusion detection/prevention systems (IDS/IPS) with signatures for path traversal attacks. Regularly audit router configurations and logs for signs of compromise. Educate network administrators about this vulnerability and ensure they follow best practices for device hardening. Finally, maintain an asset inventory to identify all affected devices to prioritize replacement efforts.