CVE-2026-112360 in EAP930
Summary
by MITRE • 10/20/2026
A security vulnerability has been detected in Netis EAP930 1.250905.115454. This issue affects the function return200 of the file /cgi-bin/debug of the component CGI Endpoint. The manipulation of the argument SIGNATURE leads to backdoor. The attack may be initiated remotely. A high degree of complexity is needed for the attack. The exploitability is assessed as difficult. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 10/20/2026
The Netis EAP930 wireless access point, specifically running firmware version 1.250905.115454, contains a critical security flaw within its Common Gateway Interface endpoint located at the path /cgi-bin/debug. This vulnerability centers on the return200 function, which is responsible for handling HTTP responses during diagnostic or debugging operations. The core technical deficiency lies in how this function processes the SIGNATURE argument provided by the client request. Instead of strictly validating that the signature corresponds to a legitimate administrative action or verifying its cryptographic integrity against expected values, the implementation fails to enforce adequate access controls or input sanitization mechanisms. This lack of rigorous validation allows an attacker to manipulate the SIGNATURE parameter in a manner that bypasses intended security checks, effectively tricking the device into executing arbitrary code or revealing sensitive internal states under the guise of a standard debug operation.
From a technical perspective, this flaw represents a classic case of improper input validation leading to unauthorized access and potential remote code execution capabilities. The manipulation of the SIGNATURE argument suggests that the application logic does not adequately verify whether the caller has the necessary privileges to perform the requested action or if the signature is valid for the current session context. By crafting specific requests with manipulated signatures, an attacker can exploit this weakness to gain unauthorized control over the device's administrative functions. This type of vulnerability aligns closely with CWE-287 Improper Authentication and CWE-94 Command Injection via CGI scripts, as it allows external actors to subvert the intended security architecture of the embedded system. The presence of such a backdoor mechanism within a debug interface is particularly concerning because these interfaces are often left enabled in production environments for troubleshooting purposes, thereby expanding the attack surface significantly.
The operational impact of this vulnerability is severe due to its remote exploitability and the nature of the resulting access. Although the assessment indicates that achieving exploitation requires a high degree of complexity, meaning it may involve specific timing conditions or precise payload construction, the ability to initiate attacks remotely over the network makes it accessible to any adversary with connectivity to the device's management interface. Once exploited, an attacker could potentially take full control of the Netis EAP930, using it as a pivot point for further lateral movement within the local network. This could lead to data exfiltration, interception of unencrypted traffic, or integration into botnets such as Mirai variants that target IoT devices. The persistence of this backdoor implies long-term compromise risks if not addressed, allowing attackers to maintain access even after routine reboots unless the firmware is patched or reset securely.
Mitigation strategies must prioritize immediate remediation given the severity and remote nature of the threat. Since the vendor has been unresponsive to disclosure attempts, users cannot rely on an official patch in a timely manner. The most effective mitigation involves disabling the debug interface entirely if it is not strictly required for ongoing operations. Administrators should restrict access to the /cgi-bin/debug endpoint by configuring firewall rules or VLAN segmentation to limit exposure only to trusted management networks where possible. Additionally, changing default credentials and ensuring that administrative interfaces are not exposed directly to untrusted networks can reduce the likelihood of successful exploitation. Long-term resolution requires upgrading to a newer firmware version if one becomes available from alternative sources or replacing the device with hardware from vendors who adhere to responsible disclosure practices and provide timely security updates. Organizations should also implement network monitoring solutions capable of detecting anomalous HTTP requests targeting CGI endpoints, which may indicate active exploitation attempts against this vulnerability.