CVE-2026-35906 in T625Pro
Summary
by MITRE • 06/04/2026
An undocumented debug CGI endpoint in T3 Technology CPE models T625Pro v1.0.07, T6825G v1.0.03 allows unauthenticated attackers to execute arbitrary system commands as root via supplying a crafted HTTP query string.
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Analysis
by VulDB Data Team • 06/04/2026
This vulnerability represents a critical security flaw in T3 Technology CPE models T625Pro v1.0.07 and T6825G v1.0.03 where an undocumented debug CGI endpoint exposes system command execution capabilities without authentication requirements. The flaw exists within the web interface implementation of these network devices, creating a backdoor access vector that bypasses normal authentication mechanisms. The vulnerability is classified as a command injection flaw that directly maps to CWE-77 and CWE-94, representing improper input validation and execution of arbitrary code. Attackers can exploit this by crafting malicious HTTP query strings that are processed by the debug endpoint, allowing them to execute system commands with root privileges. This represents a severe privilege escalation vulnerability that transforms a simple network device into a potential entry point for broader network compromise.
The technical implementation of this vulnerability stems from the presence of a debug CGI script that was not properly secured or removed from production builds. The endpoint accepts user-supplied parameters through HTTP query strings and directly incorporates these inputs into system command execution without proper sanitization or validation. This design flaw violates fundamental security principles of input validation and privilege separation. The absence of authentication requirements means that any attacker with network access can exploit this vulnerability, making it particularly dangerous in environments where these devices are exposed to untrusted networks. The vulnerability demonstrates poor secure coding practices and inadequate security testing during the development lifecycle, as debug functionality should never be present in production deployments.
The operational impact of this vulnerability is severe and far-reaching for organizations deploying these CPE models. An unauthenticated attacker can gain complete root access to the affected devices, enabling them to modify device configurations, extract sensitive data, install malware, or use the compromised device as a pivot point for attacking other systems within the network. The vulnerability affects network infrastructure devices that are often considered trusted components, making the compromise particularly damaging. From an attack perspective, this vulnerability aligns with ATT&CK technique T1059.001 for command and scripting interpreter and T1068 for exploit for privilege escalation. The exposure of root-level command execution capabilities means attackers can potentially establish persistent backdoors, modify network routing, or disrupt network services, leading to significant operational disruption and potential data breaches.
Organizations should immediately implement network segmentation to isolate these devices from untrusted networks and apply firmware updates from T3 Technology when available. Network monitoring should be enhanced to detect unusual command execution patterns or suspicious HTTP query string patterns targeting known debug endpoints. The vulnerability highlights the importance of conducting regular security assessments of network infrastructure devices, including thorough penetration testing and code reviews to identify undocumented functionality. Security teams should also implement network access controls and firewall rules to restrict access to these devices to only authorized administrative networks. Additionally, organizations should consider implementing device integrity monitoring solutions that can detect unauthorized modifications to device firmware or configuration files. This vulnerability underscores the critical need for secure development practices and the removal of debug functionality from production deployments, as outlined in OWASP secure coding guidelines and NIST cybersecurity frameworks.