CVE-2024-42757 is a command injection vulnerability identified in the Asus RT-N15U router firmware version 3.0.0.4.376_3754. The vulnerability resides in the netstat function page of the router’s web interface, which fails to properly sanitize user input. This flaw allows a remote attacker to inject and execute arbitrary commands on the underlying operating system without requiring any authentication or user interaction. The vulnerability is classified under CWE-78 (Improper Neutralization of Special Elements used in an OS Command), indicating that the input passed to system commands is not correctly validated or escaped. The CVSS v3.1 base score of 9.8 reflects the critical nature of this issue, with attack vector being network-based (AV:N), no privileges required (PR:N), no user interaction (UI:N), and full impact on confidentiality, integrity, and availability (C:H/I:H/A:H). Exploiting this vulnerability could allow attackers to take full control of the affected device, manipulate network traffic, intercept sensitive data, or launch further attacks within the victim’s network. Currently, no patches or firmware updates have been published, and no known exploits are reported in the wild, but the severity and ease of exploitation make this a high-priority threat for organizations using this device.

The impact of CVE-2024-42757 is severe for organizations worldwide using the Asus RT-N15U router. Successful exploitation can lead to complete compromise of the router, enabling attackers to execute arbitrary commands with system-level privileges. This can result in unauthorized access to internal networks, interception or manipulation of network traffic, disruption of network services, and potential pivoting to other connected systems. Confidential information such as credentials, internal communications, and sensitive data could be exposed or altered. The availability of the network could be disrupted by attackers disabling or reconfiguring the router. Given that no authentication is required, any exposed device on the internet or accessible internal network segment is vulnerable, increasing the attack surface significantly. The lack of current patches exacerbates the risk, potentially leading to widespread exploitation once public exploits emerge.

To mitigate CVE-2024-42757, organizations should immediately restrict access to the Asus RT-N15U router’s management interface by implementing network segmentation and firewall rules to limit access only to trusted administrators. Disable remote management features if not required, especially WAN-side access. Monitor network traffic for unusual patterns or unexpected command execution attempts targeting the netstat function page. Employ intrusion detection/prevention systems (IDS/IPS) with updated signatures to detect exploitation attempts. Regularly backup router configurations and maintain an inventory of affected devices for rapid response. Engage with Asus support channels to obtain firmware updates or advisories and apply patches promptly once released. Consider replacing vulnerable devices with models that have a stronger security posture if patches are delayed. Additionally, educate network administrators about this vulnerability and enforce strong password policies to reduce risk from secondary attack vectors.