CVE-2026-35904 in T625Pro
Summary
by MITRE • 06/04/2026
Incorrect access control in the web management interface of T3 Technology CPE models T625Pro v1.0.07, T6825G v1.0.03, and T7281 v1.0.03 allows unauthorized attackers to enable the Telnet service via sending a crafted request to a vulnerable CGI component.
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Analysis
by VulDB Data Team • 06/04/2026
This vulnerability represents a critical access control flaw in the web management interface of T3 Technology CPE devices, specifically affecting models T625Pro v1.0.07, T6825G v1.0.03, and T7281 v1.0.03. The issue stems from improper validation of user permissions within the CGI component responsible for managing system services, allowing unauthenticated attackers to execute privileged operations through crafted HTTP requests. The vulnerability falls under CWE-285, which specifically addresses improper authorization within software applications. This misconfiguration enables attackers to remotely enable Telnet service without proper authentication, creating a significant security risk as Telnet provides unencrypted remote access to the device. The flaw operates at the application layer and demonstrates a classic lack of input validation and privilege escalation controls. Attackers can exploit this vulnerability by sending specially crafted requests to the affected CGI endpoint, bypassing the normal authentication mechanisms that should prevent unauthorized modification of system services.
The operational impact of this vulnerability extends beyond simple unauthorized access, as enabling Telnet service provides attackers with a persistent backdoor into the network infrastructure. This represents a serious deviation from the principle of least privilege and demonstrates poor security design in the device's management interface. The vulnerability can be exploited remotely without requiring any prior authentication credentials, making it particularly dangerous for network administrators who may not be aware of the exposed management interface. According to ATT&CK framework, this vulnerability maps to T1078.004 (Valid Accounts: SSH/Telnet) and T1059.001 (Command and Scripting Interpreter: PowerShell), as attackers can leverage the enabled Telnet service to establish persistent access and execute commands on the compromised device. The affected devices typically operate in enterprise and residential network environments where they serve as critical points of network access and control.
Security implications of this vulnerability include potential network infiltration, data exfiltration, and lateral movement within the compromised network. The enabled Telnet service creates an unencrypted communication channel that can be intercepted and exploited by malicious actors, violating fundamental security principles of network communication. Network administrators should consider this vulnerability as a high-priority issue requiring immediate attention, particularly in environments where these devices are exposed to untrusted networks or where network segmentation is insufficient. The vulnerability also highlights the importance of secure coding practices and proper input validation in web-based management interfaces, as demonstrated by the CWE-285 classification. Organizations should implement network monitoring to detect unauthorized Telnet connections and ensure that all management interfaces are properly secured with strong authentication mechanisms. Additionally, this vulnerability underscores the need for regular security assessments of network infrastructure devices and the importance of keeping firmware updated with the latest security patches from vendors. The flaw represents a significant risk to network security posture and requires immediate remediation through firmware updates or network segmentation measures to prevent exploitation.