CVE-2025-29519 is a command injection vulnerability identified in the D-Link DSL-7740C router, specifically in the firmware version DSL7740C.V6.TR069.20211230. The vulnerability exists in the handling of the EXE parameter within the device's web interface, which processes GET requests. An attacker can exploit this flaw by crafting a malicious GET request that injects arbitrary commands into the system. This occurs due to insufficient input validation or sanitization of the EXE parameter, allowing command injection (classified under CWE-77). The vulnerability does not require any authentication or user interaction, making it remotely exploitable over the network. The CVSS v3.1 base score is 5.3 (medium severity), with an attack vector of network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), and no user interaction needed (UI:N). The impact is limited to integrity, as the attacker can execute arbitrary commands that may alter system behavior or configuration but does not directly affect confidentiality or availability. No known exploits are reported in the wild yet, and no patches have been linked or published at this time.

For European organizations, the exploitation of this vulnerability could lead to unauthorized command execution on affected D-Link DSL-7740C routers, potentially allowing attackers to manipulate device configurations, install persistent backdoors, or pivot into internal networks. While the vulnerability does not directly compromise confidentiality or availability, the integrity impact can facilitate further attacks such as network reconnaissance, lateral movement, or disruption of network services. Organizations relying on this specific router model for critical network infrastructure or remote access could face increased risk of targeted attacks. Given the lack of authentication and user interaction requirements, attackers can exploit this vulnerability remotely, increasing the threat surface. The medium severity score suggests moderate risk, but the actual impact depends on the deployment context and network segmentation practices within European enterprises.

1. Immediate mitigation should include isolating affected D-Link DSL-7740C devices from untrusted networks to reduce exposure. 2. Network administrators should implement strict firewall rules to restrict access to the router's management interface, allowing only trusted IP addresses or internal networks. 3. Monitor network traffic for unusual GET requests targeting the EXE parameter or other suspicious activity indicative of command injection attempts. 4. Employ network intrusion detection/prevention systems (IDS/IPS) with updated signatures to detect exploitation attempts. 5. Contact D-Link support or check official channels regularly for firmware updates or patches addressing this vulnerability. 6. As a longer-term measure, consider replacing affected devices with models that have a better security track record and receive timely updates. 7. Conduct regular security audits and penetration tests focusing on network devices to identify similar vulnerabilities proactively.