CVE-2025-13552 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 an unspecified function within the /boafrm/formWlEncrypt file, where the submit-url argument is improperly handled, leading to a buffer overflow condition. This flaw allows an attacker to send a specially crafted request remotely to the affected router without requiring authentication or user interaction. Exploiting this vulnerability could enable arbitrary code execution with elevated privileges, potentially allowing full control over the device. The vulnerability has been assigned a CVSS 4.0 base score of 8.7, reflecting its high severity due to network attack vector, low complexity, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability. Although no confirmed exploits have been detected in the wild, a public exploit has been released, increasing the risk of imminent attacks. The affected devices are commonly used in home and small office environments, which may serve as entry points into larger networks if compromised. The lack of available patches at the time of disclosure necessitates immediate risk mitigation strategies to prevent exploitation.

For European organizations, exploitation of CVE-2025-13552 could lead to significant security breaches. Compromise of affected routers can result in unauthorized access to internal networks, interception or manipulation of network traffic, and disruption of internet connectivity. This is particularly critical for small and medium enterprises (SMEs) and home office setups that rely on these devices for perimeter security. Attackers gaining control over routers can deploy persistent malware, conduct man-in-the-middle attacks, or pivot to other internal systems, potentially leading to data breaches or operational downtime. The high severity and remote exploitability increase the urgency for organizations to address this vulnerability promptly. Additionally, the public availability of an exploit increases the likelihood of automated scanning and exploitation attempts targeting vulnerable devices across Europe.

1. Monitor D-Link's official channels for firmware updates addressing CVE-2025-13552 and apply patches immediately upon release. 2. Until patches are available, restrict remote access to router management interfaces by disabling WAN-side administration or limiting access via firewall rules to trusted IP addresses. 3. Segment networks to isolate vulnerable routers from critical infrastructure and sensitive data systems. 4. Implement network intrusion detection systems (NIDS) to detect anomalous traffic patterns targeting the /boafrm/formWlEncrypt endpoint or unusual submit-url parameters. 5. Encourage users to change default credentials and use strong passwords to reduce the risk of further exploitation. 6. Conduct regular vulnerability scans on network devices to identify unpatched or misconfigured routers. 7. Educate IT staff and users about the risks associated with this vulnerability and signs of compromise. 8. Consider temporary replacement of affected devices in high-risk environments if patching is delayed.