CVE-2025-13550 is a buffer overflow vulnerability identified in the D-Link DIR-822K and DWR-M920 routers, specifically in an unknown function associated with the /boafrm/formVpnConfigSetup endpoint. The vulnerability arises from improper handling of the submit-url argument, which can be manipulated by an attacker to overflow a buffer. This flaw allows remote attackers to execute arbitrary code on the device without requiring authentication or user interaction, as the vulnerable endpoint is accessible remotely. The CVSS 4.0 score of 8.7 reflects a high severity, highlighting the critical impact on confidentiality, integrity, and availability. The vulnerability affects firmware versions 1.00_20250513164613 and 1.1.50. Although no active exploits have been reported in the wild, the public disclosure of exploit code increases the likelihood of exploitation attempts. The buffer overflow could enable attackers to gain control over the router, potentially intercepting or redirecting network traffic, disrupting VPN configurations, or launching further attacks within the internal network. The vulnerability does not require special privileges or user interaction, making it highly exploitable. The lack of available patches at the time of disclosure necessitates immediate defensive measures to mitigate risk.

For European organizations, this vulnerability poses a significant threat to network security and operational continuity. Compromise of D-Link DIR-822K routers could lead to unauthorized access to internal networks, interception of sensitive communications, and disruption of VPN services critical for secure remote access. This is particularly concerning for sectors such as finance, healthcare, government, and critical infrastructure operators that rely on secure and stable network connectivity. The ability to execute code remotely without authentication increases the risk of widespread compromise, potentially allowing attackers to establish persistent footholds or pivot to other internal systems. The impact extends beyond individual devices to the broader organizational network, potentially resulting in data breaches, service outages, and reputational damage. Given the public availability of exploit code, the window for exploitation is narrow, necessitating rapid response to prevent attacks.

1. Monitor D-Link’s official channels for firmware updates addressing CVE-2025-13550 and apply patches immediately upon release. 2. Until patches are available, disable remote management interfaces on affected devices to reduce exposure. 3. Implement network segmentation to isolate vulnerable routers from critical internal systems and sensitive data. 4. Employ intrusion detection and prevention systems (IDS/IPS) to monitor and block suspicious traffic targeting /boafrm/formVpnConfigSetup or unusual submit-url parameters. 5. Conduct regular network traffic analysis to detect anomalous patterns indicative of exploitation attempts. 6. Replace or upgrade devices running affected firmware versions if patching is delayed or not feasible. 7. Educate IT staff about this vulnerability and ensure incident response plans include steps for rapid containment and remediation. 8. Restrict VPN configuration changes to trusted internal networks and authenticated users only. 9. Maintain an asset inventory to identify all affected devices within the organization for targeted mitigation.