CVE-2026-0581 identifies a command injection vulnerability in the Tenda AC1206 router firmware version 15.03.06.23. The vulnerability resides in the formBehaviorManager function of the /goform/BehaviorManager HTTP endpoint, part of the embedded httpd component. Attackers can manipulate input parameters such as modulename, option, data, or switch to inject and execute arbitrary system commands remotely. This flaw does not require authentication or user interaction, increasing its risk profile. The vulnerability arises from insufficient input validation or sanitization, allowing crafted HTTP requests to pass malicious payloads directly to the underlying system shell. Although the CVSS 4.0 base score is 5.3 (medium), reflecting limited impact on confidentiality, integrity, and availability, the exploitability is high due to network accessibility and no required privileges. The vulnerability has been publicly disclosed, but no confirmed exploits in the wild have been reported yet. The affected device is commonly used in SOHO environments, where compromise could lead to unauthorized network access, data interception, or pivoting to internal networks. The lack of vendor patches at the time of disclosure necessitates interim mitigations to reduce exposure.

For European organizations, especially small businesses and home offices relying on Tenda AC1206 routers, this vulnerability poses a risk of unauthorized remote command execution. Exploitation could lead to device compromise, enabling attackers to intercept or manipulate network traffic, deploy malware, or establish persistent footholds within internal networks. This may result in data breaches, disruption of network services, or lateral movement to more critical systems. Given the router’s role as a network gateway, successful attacks could undermine confidentiality and integrity of communications. The medium severity score reflects moderate impact, but the ease of remote exploitation without authentication elevates the threat level. Organizations with limited IT security resources may be particularly vulnerable, as they might not promptly detect or respond to such intrusions. Additionally, the absence of known exploits in the wild currently reduces immediate risk but does not preclude future attacks.

1. Immediately restrict remote management access to the Tenda AC1206 router by disabling WAN-side HTTP/HTTPS administration interfaces or limiting access to trusted IP addresses. 2. Monitor network traffic for unusual or malformed HTTP requests targeting /goform/BehaviorManager endpoints, using IDS/IPS solutions with custom signatures if necessary. 3. Implement network segmentation to isolate SOHO routers from critical internal systems, minimizing potential lateral movement. 4. Regularly check for and apply official firmware updates from Tenda addressing this vulnerability once released. 5. If patching is delayed, consider replacing vulnerable devices with alternative models from vendors with stronger security track records. 6. Educate users on the risks of exposing router management interfaces to the internet and enforce strong administrative credentials. 7. Employ network-level firewalls to block unsolicited inbound traffic to router management ports. 8. Conduct periodic vulnerability assessments to identify exposed devices and verify mitigation effectiveness.