CVE-2026-24427 in AC7
Summary
by MITRE • 02/03/2026
Shenzhen Tenda AC7 firmware version V03.03.03.01_cn and prior expose sensitive information in web management responses. Administrative credentials, including the router and/or admin panel password, are included in plaintext within configuration response bodies. In addition, responses lack appropriate Cache-Control directives, which may permit web browsers to cache pages containing these credentials and enable subsequent disclosure to an attacker with access to the client system or browser profile.
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Analysis
by VulDB Data Team • 02/10/2026
The vulnerability identified as CVE-2026-24427 represents a critical security flaw in the Shenzhen Tenda AC7 firmware versions up to and including V03.03.03.01_cn. This issue manifests through the improper handling of sensitive data within the web management interface responses, creating an avenue for unauthorized information disclosure that directly compromises the security posture of affected network devices. The flaw exists at the application layer where administrative credentials are inadvertently exposed in plaintext format within HTTP response bodies, fundamentally undermining the confidentiality of authentication information.
The technical implementation of this vulnerability stems from inadequate input validation and output sanitization practices within the firmware's web server component. When legitimate administrative users access the router's management interface, the system fails to properly filter or encrypt sensitive credential information before transmitting it in response payloads. This design oversight allows attackers to intercept and extract administrative passwords through simple network traffic analysis or by leveraging automated tools that parse web responses. The vulnerability directly maps to CWE-200, which addresses the exposure of sensitive information, and represents a failure in proper access control implementation according to CWE-285. The presence of plaintext credentials in configuration responses creates a persistent security risk that extends beyond the immediate network boundary.
The operational impact of this vulnerability extends far beyond simple credential exposure, as it provides attackers with persistent access to network infrastructure that can be leveraged for further compromise. Once an attacker obtains the administrative credentials, they can modify router configurations, establish backdoors, redirect traffic, or disable security features entirely. The absence of Cache-Control headers in web responses compounds the risk by enabling browsers to cache pages containing sensitive information, which means that even if the initial attack occurs over an unsecured network, cached credentials can be retrieved from compromised client systems. This behavior aligns with ATT&CK technique T1566, specifically focusing on credential access through network sniffing and cache poisoning methods. The vulnerability creates a persistent threat vector that can be exploited by attackers with minimal technical expertise, particularly in environments where the router's management interface is accessible from untrusted networks.
Mitigation strategies for this vulnerability require immediate implementation of multiple defensive measures to address both the credential exposure and caching issues. Network administrators should implement immediate firmware updates from Tenda's official sources to address the root cause of the vulnerability. Additionally, implementing proper HTTP headers including Cache-Control directives with no-store and no-cache values will prevent browsers from caching sensitive responses. The deployment of network segmentation and firewall rules to restrict access to the router's management interface to trusted IP ranges should be enforced. Organizations should also consider implementing network monitoring solutions that can detect unusual traffic patterns indicating credential harvesting attempts. According to NIST SP 800-53 security controls, this vulnerability requires implementation of access control measures and information protection controls to prevent unauthorized access and information disclosure. Regular security audits and vulnerability assessments should be conducted to identify similar issues in other network devices, particularly those running legacy firmware versions that may contain similar credential exposure flaws.