CVE-2026-2905 in HG9
Summary
by MITRE • 02/22/2026
A vulnerability was identified in Tenda HG9 300001138. This impacts an unknown function of the file /boaform/formWlanSetup of the component Wireless Configuration Endpoint. The manipulation of the argument ssid leads to stack-based buffer overflow. The attack may be initiated remotely. The exploit is publicly available and might be used.
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Analysis
by VulDB Data Team • 02/23/2026
The vulnerability identified in Tenda HG9 300001138 represents a critical stack-based buffer overflow flaw within the wireless configuration endpoint component of the device. This issue resides in the /boaform/formWlanSetup file where the ssid argument parameter is processed without adequate bounds checking, creating an exploitable condition that can be leveraged by remote attackers. The vulnerability stems from improper input validation mechanisms that fail to constrain the length of user-supplied data, allowing malicious actors to overflow the allocated stack buffer and potentially overwrite adjacent memory regions.
The technical exploitation of this vulnerability follows a classic stack buffer overflow pattern where an attacker can manipulate the ssid parameter to exceed the buffer's allocated capacity. This type of flaw falls under CWE-121 which categorizes stack-based buffer overflow conditions, and aligns with ATT&CK technique T1203 which involves exploitation of remote services through buffer overflow attacks. The attack vector is particularly concerning as it can be initiated remotely without requiring physical access or authentication, making the device susceptible to widespread exploitation across networked environments. The publicly available exploit status significantly amplifies the risk profile, as it eliminates the need for advanced technical skills to leverage this vulnerability.
The operational impact of this vulnerability extends beyond simple privilege escalation or denial of service scenarios. Remote exploitation could enable attackers to execute arbitrary code on the affected device, potentially leading to complete system compromise and unauthorized access to the network. The wireless configuration endpoint represents a critical control point for network security, making this vulnerability particularly dangerous as it could allow attackers to modify wireless settings, disable security features, or establish persistent backdoors. The attack surface is further expanded by the fact that this vulnerability affects a web-based administrative interface, meaning that any user with network access could potentially exploit it, creating a significant risk for enterprise and residential networks alike.
Mitigation strategies for this vulnerability should prioritize immediate firmware updates from Tenda, as the manufacturer would need to implement proper bounds checking for the ssid parameter and ensure that input validation prevents buffer overflows. Network segmentation and access control measures should be implemented to limit exposure of the affected device to untrusted networks, while regular security audits should monitor for similar vulnerabilities in other network components. The implementation of web application firewalls and intrusion detection systems can help detect and prevent exploitation attempts targeting this specific vulnerability, though the most effective long-term solution remains the prompt deployment of vendor-provided security patches that address the underlying buffer overflow condition in the wireless configuration endpoint component.