CVE-2025-60570 is a buffer overflow vulnerability identified in the D-Link DIR600L Ax router firmware version FW116WWb01. The flaw exists in the formLogDnsquery function, specifically through improper handling of the curTime parameter. Buffer overflow vulnerabilities occur when input data exceeds the allocated buffer size, potentially overwriting adjacent memory and allowing attackers to execute arbitrary code, crash the device, or cause denial of service. In this case, an attacker can craft malicious input targeting the curTime parameter to trigger the overflow. Although no public exploits or patches have been reported yet, the vulnerability's presence in a widely deployed consumer router model raises concerns. The DIR600L Ax is commonly used in home and small office environments, making it a potential vector for attackers to gain network footholds or disrupt connectivity. The absence of a CVSS score means severity must be inferred from the nature of the vulnerability: buffer overflows are typically critical or high severity due to their potential for remote code execution. The vulnerability does not specify authentication requirements, suggesting it may be exploitable remotely if the router's management interface or affected service is exposed. This increases the risk profile. The vulnerability was reserved in late September 2025 and published in October 2025, indicating recent discovery and disclosure. No patches or mitigation advisories have been released by D-Link at the time of this report, so affected users remain vulnerable. The lack of known exploits in the wild may indicate limited current exploitation but does not preclude future attacks. Given the router's role as a network gateway, successful exploitation could compromise network confidentiality, integrity, and availability, affecting connected devices and data flows.

For European organizations, especially small and medium enterprises (SMEs) and home offices relying on the D-Link DIR600L Ax router, this vulnerability poses significant risks. Exploitation could allow attackers to execute arbitrary code on the router, potentially gaining control over network traffic, intercepting sensitive data, or launching further attacks within the internal network. Disruption of router functionality could lead to denial of service, impacting business continuity and productivity. The vulnerability's potential for remote exploitation without authentication increases exposure, particularly if routers are accessible from the internet or poorly segmented networks. Given the widespread use of D-Link routers in Europe, especially in residential and small business environments, the threat could affect a large number of endpoints. Compromise of these routers could also be leveraged as part of larger botnets or for lateral movement in targeted attacks. The impact extends beyond individual devices to the broader network security posture of affected organizations, potentially undermining trust and compliance with data protection regulations such as GDPR if sensitive data is intercepted or disrupted.

1. Immediate identification and inventory of all D-Link DIR600L Ax routers within the organization to assess exposure. 2. Restrict access to router management interfaces by disabling remote administration and limiting local network access using strong access control lists. 3. Employ network segmentation to isolate vulnerable routers from critical systems and sensitive data environments. 4. Monitor network traffic for unusual DNS query patterns or anomalous behavior that could indicate exploitation attempts targeting the formLogDnsquery function. 5. Implement intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics capable of detecting buffer overflow attempts or malformed packets targeting the curTime parameter. 6. Regularly check for firmware updates or security advisories from D-Link and apply patches promptly once available. 7. Educate users on the risks of exposing router interfaces to the internet and encourage secure configuration practices. 8. Consider replacing affected routers with models that have confirmed security support and timely patching if mitigation options are limited. 9. Employ network-level protections such as firewalls to block unsolicited inbound traffic to router management ports. 10. Maintain up-to-date backups of router configurations to enable rapid recovery if devices are compromised or require reinstallation.