CVE-2025-13548 is a buffer overflow vulnerability identified in D-Link DIR-822K and DWR-M920 routers running specific firmware versions (1.00_20250513164613 and 1.1.50). The vulnerability resides in the handling of the submit-url parameter within the /boafrm/formFirewallAdv endpoint, which is part of the router's web management interface. An attacker can remotely send a specially crafted HTTP request manipulating this parameter to overflow a buffer, potentially overwriting memory and enabling arbitrary code execution or causing a denial of service. The vulnerability does not require authentication or user interaction, making it highly exploitable over the network. The CVSS v4.0 score of 8.7 reflects the high impact on confidentiality, integrity, and availability, with low attack complexity and no privileges required. Although no active exploits have been observed in the wild, the public disclosure of exploit details increases the risk of imminent attacks. The affected devices are commonly used in home and small business environments, where compromise could lead to network traffic interception, lateral movement, or disruption of internet connectivity. The lack of available patches at the time of disclosure necessitates immediate mitigation strategies to reduce exposure.

For European organizations, this vulnerability poses a significant risk to network infrastructure, especially for small and medium-sized enterprises and home office environments relying on D-Link DIR-822K and DWR-M920 routers. Exploitation could lead to unauthorized access to internal networks, interception of sensitive data, and disruption of internet connectivity, impacting business operations and data confidentiality. The ability to execute arbitrary code remotely without authentication increases the likelihood of widespread compromise. Additionally, compromised routers could be leveraged as footholds for further attacks or as part of botnets, amplifying the threat landscape. Given the widespread use of D-Link routers in Europe, particularly in Germany, France, and the UK, the potential impact includes operational downtime, reputational damage, and increased incident response costs.

1. Monitor D-Link’s official channels for firmware updates addressing CVE-2025-13548 and apply patches immediately upon release. 2. Until patches are available, restrict access to the router’s web management interface by limiting it to trusted IP addresses or disabling remote management features. 3. Implement network segmentation to isolate vulnerable routers from critical infrastructure and sensitive data environments. 4. Deploy intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics to detect anomalous HTTP requests targeting /boafrm/formFirewallAdv or suspicious submit-url parameters. 5. Regularly audit router configurations and logs for signs of exploitation attempts or unauthorized access. 6. Educate users and administrators about the risks of using outdated firmware and the importance of timely updates. 7. Consider replacing vulnerable devices with models that have a stronger security track record if patching is delayed or unsupported.