CVE-2025-60557 is a buffer overflow vulnerability identified in the D-Link DIR600L Ax router firmware version FW116WWb01. The vulnerability arises from improper handling of the curTime parameter within the formSetEasy_Wizard function, which fails to properly validate input length or content, leading to a stack-based buffer overflow (CWE-121). This flaw can be exploited remotely over the network without authentication or user interaction, as indicated by the CVSS vector (AV:N/AC:L/PR:N/UI:N). Successful exploitation results in a denial of service (DoS) condition by crashing or rebooting the router, thereby disrupting network availability. Although no known exploits have been reported in the wild and no official patches have been released, the vulnerability poses a significant risk due to the widespread use of D-Link routers in home and small business environments. The lack of confidentiality or integrity impact suggests the exploit primarily affects availability. The vulnerability was reserved on 2025-09-26 and published on 2025-10-24, with a CVSS v3.1 base score of 7.5, categorizing it as high severity. The absence of patches necessitates proactive mitigation measures to protect affected devices and networks.

For European organizations, this vulnerability could lead to significant network disruptions, especially in small to medium enterprises and home office environments where the D-Link DIR600L Ax router is deployed. The denial of service caused by the buffer overflow could interrupt internet connectivity, affecting business operations, communications, and access to cloud services. Critical infrastructure relying on these routers for network access or segmentation could experience outages, potentially impacting service delivery and operational continuity. Although the vulnerability does not compromise confidentiality or integrity, the loss of availability can have cascading effects on productivity and security monitoring. The ease of exploitation without authentication increases the risk of automated attacks or worm propagation within vulnerable networks. Organizations lacking network segmentation or remote management controls are particularly vulnerable. The absence of known exploits currently provides a window for remediation, but the high severity score underscores the urgency of addressing this issue.

1. Immediately disable remote management interfaces on affected D-Link DIR600L Ax routers to reduce exposure to external attacks. 2. Implement network segmentation to isolate vulnerable routers from critical systems and sensitive data. 3. Monitor network traffic and device logs for unusual activity or repeated crashes indicative of exploitation attempts. 4. Where possible, replace affected routers with models that have received security updates or are not vulnerable. 5. Apply strict firewall rules to limit inbound traffic to router management ports. 6. Educate users and administrators about the vulnerability and encourage prompt reporting of connectivity issues. 7. Regularly check D-Link’s official channels for firmware updates or patches addressing this vulnerability. 8. Consider deploying intrusion detection/prevention systems (IDS/IPS) with signatures targeting exploitation attempts of this specific buffer overflow. 9. Maintain an inventory of all network devices to quickly identify and remediate vulnerable hardware. 10. For critical environments, consider temporary network access restrictions until a patch is available.