CVE-2025-15137 is a command injection vulnerability identified in the TRENDnet TEW-800MB wireless router, specifically version 1.0.1.0. The vulnerability resides in the NTPSyncWithHost.cgi script within the sub_F934 function, which improperly sanitizes input parameters, allowing an attacker to inject and execute arbitrary system commands remotely. The attack vector is network-based with no authentication or user interaction required, making it highly exploitable. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:L), no user interaction (UI:N), and high impact on confidentiality, integrity, and availability (VC:H, VI:H, VA:H). The exploit code has been publicly disclosed, although no active exploitation in the wild has been reported yet. The vendor TRENDnet has not issued any patches or advisories, leaving affected devices exposed. This vulnerability could allow attackers to take full control of the device, manipulate network traffic, exfiltrate sensitive data, or disrupt network availability. Given the device’s role in network infrastructure, exploitation could have cascading effects on connected systems and services.

For European organizations, exploitation of CVE-2025-15137 could lead to severe consequences including unauthorized remote control of network devices, interception or manipulation of network traffic, and potential lateral movement within corporate networks. Confidentiality breaches could expose sensitive business or personal data, while integrity compromises could alter critical configurations or data flows. Availability impacts could result in denial of service or network outages, disrupting business operations. Organizations relying on TRENDnet TEW-800MB devices in critical environments such as healthcare, finance, or government sectors face heightened risks. The lack of vendor response and patches exacerbates the threat, requiring organizations to implement compensating controls. The public availability of exploit code increases the likelihood of opportunistic attacks, including by cybercriminals or state-sponsored actors targeting European infrastructure.

Since no official patch is available, European organizations should immediately implement network segmentation to isolate affected TRENDnet TEW-800MB devices from sensitive internal networks. Restrict remote access to these devices using firewall rules and VPNs, and disable any unnecessary services, especially those related to NTP synchronization or CGI interfaces. Monitor network traffic for unusual command execution patterns or unexpected outbound connections from these devices. Employ intrusion detection/prevention systems (IDS/IPS) with signatures tuned for command injection attempts targeting TRENDnet devices. Consider replacing vulnerable devices with updated hardware from vendors with active security support. Maintain an inventory of all TRENDnet TEW-800MB devices to ensure comprehensive coverage. Regularly review logs and alerts for signs of compromise. Engage with TRENDnet support channels for updates and advisories. Finally, educate IT staff about this vulnerability and response procedures to ensure rapid detection and containment.