The vulnerability identified as CVE-2025-60550 affects the D-Link DIR600L Ax router firmware version FW116WWb01. It is a buffer overflow issue located in the formEasySetTimezone function, specifically triggered by the curTime parameter. Buffer overflow vulnerabilities occur when input data exceeds the allocated buffer size, potentially overwriting adjacent memory and enabling arbitrary code execution or causing system crashes. In this case, an attacker can craft a malicious request targeting the curTime parameter to exploit this overflow. The vulnerability resides in the router's firmware, which manages network traffic and device configuration, making it a critical component in network security. No CVSS score has been assigned yet, and no patches or known exploits are publicly available, indicating the vulnerability is newly disclosed. However, the nature of buffer overflows generally allows for remote exploitation without authentication if the management interface is accessible, increasing the risk. The DIR600L Ax model is a popular consumer and small business router, often deployed in European markets. Exploiting this vulnerability could allow attackers to execute arbitrary code with elevated privileges, potentially leading to full device compromise, interception or manipulation of network traffic, or denial of service conditions. The lack of authentication requirement and the potential for remote exploitation make this a significant threat. The absence of patches means affected users must rely on network-level mitigations until firmware updates are released by D-Link.

For European organizations, especially small and medium enterprises and residential users relying on the D-Link DIR600L Ax router, this vulnerability poses a risk of unauthorized remote code execution, leading to full device compromise. This could result in interception of sensitive data, manipulation of network traffic, or disruption of internet connectivity, impacting confidentiality, integrity, and availability. Compromised routers could also be leveraged as entry points for lateral movement within corporate networks or as part of botnets for broader attacks. The impact is heightened in environments where these routers are used as primary network gateways without additional security controls. Given the widespread use of D-Link routers in Europe, the vulnerability could affect a large number of endpoints, increasing the attack surface. The lack of a patch and known exploits suggests a window of exposure, during which attackers could develop and deploy exploits. The potential for denial of service could disrupt business operations, especially for small businesses lacking redundant network infrastructure.

Immediate mitigation should focus on restricting access to the router's management interface by disabling remote management features and limiting local network access to trusted devices only. Network administrators should implement strong network segmentation to isolate vulnerable routers from critical systems. Monitoring network traffic for unusual patterns or malformed packets targeting the curTime parameter can help detect attempted exploitation. Employing intrusion detection or prevention systems with custom signatures for this vulnerability is advisable. Users should regularly check D-Link's official channels for firmware updates addressing this issue and apply them promptly once available. As a temporary measure, consider replacing affected routers with models not impacted by this vulnerability or deploying additional security appliances to shield vulnerable devices. Educating users about the risks of exposing router management interfaces to the internet and enforcing strong authentication policies can reduce exploitation likelihood. Finally, organizations should maintain up-to-date backups and incident response plans to quickly recover from potential compromises.