CVE-2025-11523 is a command injection vulnerability identified in the Tenda AC7 router firmware version 15.03.06.44. The vulnerability resides in the /goform/AdvSetLanip endpoint, where the lanIp parameter is improperly sanitized, allowing an attacker to inject arbitrary system commands. The attack vector is remote network access, requiring no user interaction but low-level privileges on the device, which might be obtained through other means or default credentials. Successful exploitation can lead to execution of arbitrary commands with the privileges of the affected service, potentially allowing attackers to compromise the router’s operating system, alter configurations, intercept or redirect network traffic, or pivot to internal networks. The vulnerability affects confidentiality, integrity, and availability of the device and connected networks. Although no patches have been published yet, public exploit code is available, increasing the risk of exploitation. The vulnerability does not require complex attack conditions, but the need for low privileges limits the attack surface somewhat. The router is commonly used in small office and home office environments, which may be connected to enterprise networks, increasing the risk of lateral movement. The lack of authentication requirement for the attack vector is mitigated by the need for low privileges, but this still represents a significant risk if devices are exposed to untrusted networks.

For European organizations, exploitation of this vulnerability could lead to unauthorized control over Tenda AC7 routers, resulting in interception or manipulation of network traffic, disruption of network services, and potential entry points for further attacks within corporate networks. Confidential data passing through the router could be exposed or altered, and attackers could use compromised routers as footholds for lateral movement or launching attacks against other internal systems. Small and medium enterprises using these routers as gateways are particularly at risk, as they may lack robust network segmentation or monitoring. Critical infrastructure sectors relying on these devices for connectivity could experience service degradation or outages. The public availability of exploit code increases the likelihood of opportunistic attacks, especially in environments where firmware updates are not promptly applied. The medium severity rating suggests moderate impact, but the real-world consequences could escalate if combined with other vulnerabilities or poor network hygiene.

1. Immediately restrict remote access to the Tenda AC7 router management interface, especially from untrusted networks, by disabling WAN-side management or using firewall rules. 2. Implement strict network segmentation to isolate routers from critical internal systems, limiting potential lateral movement. 3. Monitor network traffic and device logs for unusual activity indicative of exploitation attempts, such as unexpected command execution or configuration changes. 4. Change default credentials and enforce strong authentication mechanisms to reduce the risk of privilege escalation to the required low-level privileges. 5. Regularly check for and apply firmware updates from Tenda as soon as patches addressing this vulnerability become available. 6. Consider replacing vulnerable devices with models from vendors with stronger security track records if timely patching is not feasible. 7. Educate IT staff about this vulnerability and ensure incident response plans include steps for detecting and mitigating router compromises. 8. Use network intrusion detection systems (NIDS) tuned to detect command injection patterns or known exploit signatures targeting Tenda devices.