The vulnerability identified as CVE-2025-60553 affects the D-Link DIR600L Ax router firmware version FW116WWb01. It is a buffer overflow issue located in the function formSetWAN_Wizard52, specifically triggered via the curTime parameter. Buffer overflow vulnerabilities occur when input data exceeds the allocated buffer size, potentially overwriting adjacent memory and allowing an attacker to execute arbitrary code or crash the device. In this case, the vulnerability could be exploited remotely by sending a crafted request to the router's WAN interface, as the vulnerable function is related to WAN setup. The absence of authentication requirements or user interaction increases the risk of exploitation. No CVSS score has been assigned yet, and no public exploits have been observed, but the flaw's nature suggests a significant security risk. The affected device, D-Link DIR600L Ax, is a consumer-grade router commonly deployed in home and small office networks, which could serve as an entry point for attackers to compromise internal networks or disrupt internet connectivity. The lack of available patches or vendor advisories at this time means that organizations must rely on network-level mitigations and monitoring. This vulnerability highlights the importance of timely firmware updates and secure configuration of network devices to prevent exploitation.

If exploited, this buffer overflow vulnerability could allow attackers to execute arbitrary code on the affected router, leading to full compromise of the device. This could result in unauthorized access to the internal network, interception or manipulation of network traffic, and potential lateral movement to other systems. Additionally, exploitation could cause denial of service by crashing the router, disrupting internet connectivity for users. For European organizations, especially small businesses and home offices relying on this router model, the impact includes loss of confidentiality, integrity, and availability of network communications. This could affect business operations, data privacy compliance, and overall cybersecurity posture. The lack of authentication and user interaction requirements increases the likelihood of successful remote exploitation, raising the threat level. The absence of known exploits in the wild currently limits immediate risk, but the vulnerability remains a significant concern until patched.

1. Monitor network traffic for unusual or malformed requests targeting the WAN interface of D-Link DIR600L Ax routers, particularly those involving the curTime parameter or WAN setup functions. 2. Implement network segmentation to isolate vulnerable routers from critical internal systems, reducing potential lateral movement in case of compromise. 3. Restrict remote management access to the router by disabling WAN-side administration or limiting it to trusted IP addresses. 4. Apply strict firewall rules to block unsolicited inbound traffic to the router's management ports. 5. Regularly check for firmware updates from D-Link and apply patches promptly once available. 6. Consider replacing affected devices with models that have a stronger security track record if patches are delayed. 7. Educate users about the risks of using outdated router firmware and encourage secure configuration practices. 8. Employ intrusion detection/prevention systems (IDS/IPS) to detect exploitation attempts targeting this vulnerability.