CVE-2026-35499 in Totolink
Summary
by MITRE • 10/21/2026
An os command injection vulnerability exists in the boa formWsc peerRptPin functionality of Totolink X2000R TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. A specially crafted HTTP request can lead to arbitrary code execution. An attacker can make an authenticated HTTP request to trigger this vulnerability.
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Analysis
by VulDB Data Team • 10/21/2026
The identified security flaw resides within the boa web server implementation of Totolink X2000R devices running firmware version TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327, specifically affecting the formWsc peerRptPin functionality. This component is responsible for handling Wireless Security Configuration (WSC) pin reporting operations, a feature commonly used in routers to facilitate secure network setup via push-button or PIN methods. The vulnerability manifests as an operating system command injection flaw, which allows an attacker who has successfully authenticated to the device's web interface to inject and execute arbitrary commands on the underlying host system. This type of defect is fundamentally rooted in CWE-78, commonly known as Improper Neutralization of Special Elements used in an OS Command, where input data derived from user interaction is passed directly to a shell interpreter without adequate sanitization or validation.
From a technical perspective, the vulnerability likely stems from improper handling of parameters within the peerRptPin function. When processing HTTP requests related to WSC PIN reporting, the application fails to properly escape or filter special characters such as semicolons, ampersands, or pipe operators that are interpreted by the operating system's command shell. Consequently, an authenticated attacker can craft a malicious HTTP request containing these injected elements within the input fields. Upon processing this request, the vulnerable script executes the concatenated string in the context of the web server process, which typically runs with elevated privileges on embedded Linux systems used in consumer routers. This mechanism bypasses standard application-level security controls because the execution occurs at the operating system level rather than within the application logic itself.
The operational impact of this vulnerability is severe due to its potential for arbitrary code execution. Once an attacker achieves command injection, they gain full control over the affected device's operating environment. This capability allows for complete compromise of network integrity and confidentiality. The attacker can modify routing tables, intercept traffic, install persistent backdoors or malware such as botnet clients, or pivot into other devices on the local area network. Furthermore, because many IoT devices run services with root privileges, this escalation provides unrestricted access to system files and configurations. This aligns with MITRE ATT&CK technique T1059, Command and Scripting Interpreter, which describes how adversaries use operating system command shells to execute malicious commands during post-exploitation phases.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security posture improvements. The primary defense is the application of a firmware update provided by Totolink that patches the input validation logic within the boa web server's formWsc peerRptPin module. Until such an update is available, administrators should restrict access to the device's management interface through network segmentation or firewall rules, ensuring that only trusted IP addresses can reach the administrative ports. Additionally, enforcing strong authentication policies and disabling WSC features if not strictly necessary can reduce the attack surface by eliminating the specific functionality exploited in this vector. Regular vulnerability assessments and penetration testing focused on web application security are recommended to identify similar injection flaws across other endpoints within the infrastructure.