CVE-2026-115797 in Tenda
Summary
by MITRE • 10/23/2026
A weakness has been identified in Tenda F6 12.02.01.73. Affected is an unknown function of the component Web Management Interface. Executing a manipulation of the argument ecos_pw can lead to cleartext transmission of sensitive information. The attack may be launched remotely. This attack is characterized by high complexity. The exploitability is told to be difficult. The exploit has been made available to the public and could be used for attacks.
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Analysis
by VulDB Data Team • 10/24/2026
The vulnerability identified in Tenda F6 router firmware version 12.02.01.73 represents a significant security flaw within its Web Management Interface, specifically affecting an unknown internal function that processes user input arguments. This weakness is classified under CWE-319, which denotes the use of cleartext transmission for sensitive information without cryptographic protection. The core technical issue arises from how the system handles the argument named ecos_pw during administrative operations. When this parameter is manipulated by an attacker, it triggers a response mechanism that transmits sensitive data in plaintext over the network. This behavior indicates a failure to implement proper encryption protocols or secure channel establishment for critical management traffic, exposing confidential credentials and configuration details to any entity capable of intercepting the network packets.
From an operational perspective, this vulnerability allows for remote exploitation with high complexity, meaning that while it is technically feasible to exploit, it requires specific conditions or precise timing rather than being a trivial automated attack vector. The difficulty in exploitability suggests that attackers must carefully craft requests and potentially bypass certain validation checks before the cleartext data can be successfully retrieved. Despite this complexity, the fact that an exploit has been made publicly available significantly lowers the barrier to entry for malicious actors. This public availability transforms what was once a theoretical risk into a practical threat, enabling less sophisticated adversaries to leverage existing tools or scripts to compromise affected devices. The remote nature of the attack means no physical access or prior authentication is required to initiate the initial probe, although successful exploitation likely requires some level of interaction with the web interface.
The impact of this vulnerability extends beyond simple data leakage. By obtaining sensitive information such as administrative passwords in cleartext, an attacker can gain unauthorized control over the router's configuration settings. This access allows for further malicious activities including DNS hijacking to redirect users to phishing sites, interception of unencrypted traffic passing through the network, or disabling security features like firewalls and intrusion detection systems. In a broader context, this aligns with ATT&CK technique T1078, Valid Accounts, as the stolen credentials can be used for lateral movement within a local network or persistence by modifying router settings to maintain access. The exposure of these details undermines the integrity and confidentiality guarantees expected from home networking equipment, potentially leading to privacy violations and financial loss if banking or personal data is transmitted through the compromised device.
Mitigation strategies must address both immediate remediation and long-term security posture improvements. The primary recommendation is for users to update their Tenda F6 firmware to a version where this vulnerability has been patched by the vendor. If an official patch is unavailable, administrators should consider replacing the device with one from a manufacturer that adheres to stricter security standards and provides regular updates. In environments where immediate replacement is not possible, network segmentation can help limit the blast radius; placing IoT devices on a separate VLAN isolates them from critical workstations and servers. Additionally, monitoring network traffic for unusual patterns or unauthorized access attempts to the router's management interface can aid in early detection of exploitation attempts. Users should also disable remote administration features if they are not strictly necessary, reducing the attack surface exposed to external networks. Ensuring that all connected devices use strong, unique passwords further mitigates the risk even if credentials are partially compromised.