CVE-2025-14528 is a remote information disclosure vulnerability identified in the D-Link DIR-803 router firmware up to version 1.04. The vulnerability resides in the /getcfg.php endpoint, specifically in the handling of the AUTHORIZED_GROUP argument within the configuration handler component. By manipulating this parameter, an attacker can remotely retrieve sensitive configuration data without requiring authentication or user interaction. The vulnerability is exploitable over the network (AV:N), with low attack complexity (AC:L), and no privileges or user interaction needed (PR:N/UI:N). The impact is limited to confidentiality (VC:L), with no effect on integrity or availability. The vulnerability affects only devices that are no longer supported by the vendor, and no official patches exist. Public exploit code has been released, increasing the likelihood of exploitation in the wild, although no confirmed widespread attacks have been reported yet. The disclosed information could include configuration details that might facilitate further attacks or unauthorized access. Due to the lack of vendor support, mitigation options are limited to device replacement or network-level protections. This vulnerability highlights the risks associated with using unsupported network infrastructure devices in operational environments.

For European organizations, the primary impact of CVE-2025-14528 is the potential leakage of sensitive router configuration information, which could include credentials, network topology, or other security-related settings. Such information disclosure can enable attackers to plan more targeted attacks, including unauthorized network access or lateral movement within corporate or home networks. Although the vulnerability does not directly allow code execution or denial of service, the indirect consequences of leaked configuration data can be significant, especially in environments where these routers serve as the primary gateway or are part of critical infrastructure. The fact that the affected devices are no longer supported means organizations cannot rely on vendor patches, increasing the risk exposure. European SMEs and home users who commonly deploy consumer-grade D-Link routers may be particularly vulnerable. Additionally, organizations with remote or hybrid work setups using these routers for VPN or network access could face elevated risks. The public availability of exploit code further raises the urgency for mitigation to prevent opportunistic attacks.

Given the absence of official patches due to end-of-life status, the most effective mitigation is to replace all affected D-Link DIR-803 devices with supported and updated hardware from reputable vendors. If immediate replacement is not feasible, organizations should isolate these devices from untrusted networks by implementing strict firewall rules that restrict inbound access to the router’s management interfaces, especially blocking access to /getcfg.php. Network segmentation should be employed to limit the exposure of vulnerable devices. Monitoring network traffic for unusual requests targeting /getcfg.php or suspicious manipulation of the AUTHORIZED_GROUP parameter can help detect exploitation attempts. Additionally, disabling remote management features on these routers can reduce the attack surface. Organizations should also review and update network security policies to ensure unsupported devices are identified and phased out promptly. User education about the risks of outdated network equipment can support these efforts. Finally, consider deploying intrusion detection or prevention systems capable of recognizing exploit attempts against this vulnerability.