CVE-2025-15190 is a stack-based buffer overflow vulnerability identified in the D-Link DWR-M920 router firmware versions 1.1.0 through 1.1.50. The vulnerability resides in the sub_42261C function of the /boafrm/formFilter file, where the ip6addr argument is improperly validated or sanitized, allowing an attacker to overflow the stack buffer. This flaw can be triggered remotely without requiring authentication or user interaction, making it highly exploitable over the network. The overflow can lead to arbitrary code execution, enabling attackers to take full control of the device, disrupt network services, or pivot into internal networks. The vulnerability has a CVSS 4.0 base score of 8.7, indicating high severity, with attack vector network (AV:N), low attack complexity (AC:L), no privileges required (PR:L), no user interaction (UI:N), and high impact on confidentiality, integrity, and availability (VC:H/VI:H/VA:H). Although no confirmed exploits in the wild have been reported, a public exploit has been released, increasing the likelihood of exploitation. The DWR-M920 is a 4G LTE router commonly deployed in small to medium business and residential environments, often used in Europe for broadband connectivity. The vulnerability's remote nature and potential for complete device compromise make it a critical risk for organizations relying on this hardware for network access and security.

For European organizations, exploitation of CVE-2025-15190 could lead to severe consequences including unauthorized access to internal networks, interception or manipulation of sensitive data, disruption of internet connectivity, and potential lateral movement within corporate environments. Given the router’s role as a network gateway, compromise could undermine perimeter defenses, exposing critical infrastructure and business operations to further attacks. The vulnerability threatens confidentiality by allowing attackers to access private communications, integrity by enabling malicious modifications of network traffic or device configurations, and availability by potentially causing device crashes or denial of service. Sectors such as finance, healthcare, government, and telecommunications, which often rely on secure and stable network infrastructure, are particularly at risk. The public availability of an exploit increases the urgency for mitigation, as opportunistic attackers and advanced persistent threat actors may target vulnerable devices to establish footholds or launch broader campaigns.

1. Immediately monitor D-Link’s official channels for firmware updates addressing CVE-2025-15190 and apply patches as soon as they become available. 2. Until patches are deployed, restrict remote access to the router’s management interfaces by implementing network segmentation and firewall rules that limit inbound traffic to trusted sources only. 3. Disable IPv6 functionality on affected devices if not required, as the vulnerability involves the ip6addr parameter. 4. Conduct network scans to identify all instances of DWR-M920 routers and verify firmware versions to prioritize patching. 5. Employ intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics capable of detecting exploit attempts targeting this vulnerability. 6. Educate IT staff and end users about the risks and signs of exploitation, including unexpected device behavior or network anomalies. 7. Consider replacing legacy or unsupported devices with newer hardware that receives timely security updates. 8. Maintain regular backups of router configurations and network device inventories to facilitate rapid recovery if compromise occurs.