CVE-2025-60335 is a security vulnerability identified in the TOTOLINK N600R router, specifically in firmware version 4.3.0cu.7866_B20220506. The flaw is a NULL pointer dereference occurring in the main function of the device's HTTP server component. When an attacker sends a specially crafted HTTP request to the router, the software attempts to access a memory location that has not been properly initialized or is set to NULL, causing the device's process to crash or reboot. This results in a denial of service (DoS) condition, rendering the router temporarily unavailable and disrupting network connectivity for all devices relying on it. The vulnerability does not require authentication or user interaction, making it remotely exploitable by any attacker who can reach the device's HTTP interface. Although no public exploits or active attacks have been reported so far, the vulnerability's presence in a widely used consumer router model raises concerns about potential future exploitation. The lack of a CVSS score indicates that the vulnerability is newly published and may not yet have vendor patches or detailed impact assessments. The vulnerability primarily affects the availability of network services, as the router crash interrupts normal operations. Given the router’s role as a network gateway, this can have cascading effects on organizational productivity and security monitoring.

For European organizations, exploitation of CVE-2025-60335 could lead to significant network outages, especially in small to medium enterprises or home office environments where TOTOLINK N600R routers are deployed. The denial of service caused by the router crash would interrupt internet access and internal network communications, potentially halting business operations and impacting remote work capabilities. Critical infrastructure or services relying on these routers for connectivity could experience downtime, affecting service delivery and operational continuity. Additionally, repeated exploitation attempts could be used as part of a broader attack strategy to distract or degrade network defenses. While the vulnerability does not directly compromise confidentiality or integrity, the availability impact alone can have severe operational and financial consequences. European organizations with limited IT support or patch management capabilities may be particularly vulnerable to prolonged disruptions.

To mitigate CVE-2025-60335, affected organizations should first verify if their TOTOLINK N600R routers are running the vulnerable firmware version 4.3.0cu.7866_B20220506. Since no official patch links are currently available, organizations should monitor TOTOLINK’s official channels for firmware updates addressing this issue. In the interim, network administrators should restrict access to the router’s HTTP management interface by implementing network segmentation and firewall rules that block unauthorized inbound HTTP requests from untrusted networks. Disabling remote management over HTTP or switching to more secure management protocols (e.g., HTTPS with strong authentication) can reduce exposure. Employing intrusion detection/prevention systems (IDS/IPS) to detect and block anomalous HTTP requests targeting the router may also help prevent exploitation. Regularly auditing router configurations and monitoring device logs for signs of crashes or suspicious activity is recommended. Organizations should consider replacing vulnerable devices with models from vendors with stronger security track records if timely patches are not forthcoming.