The SentinelOne Annual Threat Report - A Defenders Guide from the FrontlinesThe SentinelOne Annual Threat ReportGet the Report
Experiencing a Breach?Blog
Get StartedContact Us
SentinelOne
  • Platform
    Platform Overview
    • Singularity Platform
      Welcome to Integrated Enterprise Security
    • AI for Security
      Leading the Way in AI-Powered Security Solutions
    • Securing AI
      Accelerate AI Adoption with Secure AI Tools, Apps, and Agents.
    • How It Works
      The Singularity XDR Difference
    • Singularity Marketplace
      One-Click Integrations to Unlock the Power of XDR
    • Pricing & Packaging
      Comparisons and Guidance at a Glance
    Data & AI
    • Purple AI
      Accelerate SecOps with Generative AI
    • Singularity Hyperautomation
      Easily Automate Security Processes
    • AI-SIEM
      The AI SIEM for the Autonomous SOC
    • AI Data Pipelines
      Security Data Pipeline for AI SIEM and Data Optimization
    • Singularity Data Lake
      AI-Powered, Unified Data Lake
    • Singularity Data Lake for Log Analytics
      Seamlessly Ingest Data from On-Prem, Cloud or Hybrid Environments
    Endpoint Security
    • Singularity Endpoint
      Autonomous Prevention, Detection, and Response
    • Singularity XDR
      Native & Open Protection, Detection, and Response
    • Singularity RemoteOps Forensics
      Orchestrate Forensics at Scale
    • Singularity Threat Intelligence
      Comprehensive Adversary Intelligence
    • Singularity Vulnerability Management
      Application & OS Vulnerability Management
    • Singularity Identity
      Identity Threat Detection and Response
    Cloud Security
    • Singularity Cloud Security
      Block Attacks with an AI-Powered CNAPP
    • Singularity Cloud Native Security
      Secure Cloud and Development Resources
    • Singularity Cloud Workload Security
      Real-Time Cloud Workload Protection Platform
    • Singularity Cloud Data Security
      AI-Powered Threat Detection for Cloud Storage
    • Singularity Cloud Security Posture Management
      Detect and Remediate Cloud Misconfigurations
    Securing AI
    • Prompt Security
      Secure AI Tools Across Your Enterprise
  • Why SentinelOne?
    Why SentinelOne?
    • Why SentinelOne?
      Cybersecurity Built for What’s Next
    • Our Customers
      Trusted by the World’s Leading Enterprises
    • Industry Recognition
      Tested and Proven by the Experts
    • About Us
      The Industry Leader in Autonomous Cybersecurity
    Compare SentinelOne
    • Arctic Wolf
    • Broadcom
    • CrowdStrike
    • Cybereason
    • Microsoft
    • Palo Alto Networks
    • Sophos
    • Splunk
    • Trellix
    • Trend Micro
    • Wiz
    Verticals
    • Energy
    • Federal Government
    • Finance
    • Healthcare
    • Higher Education
    • K-12 Education
    • Manufacturing
    • Retail
    • State and Local Government
  • Services
    Managed Services
    • Managed Services Overview
      Wayfinder Threat Detection & Response
    • Threat Hunting
      World-Class Expertise and Threat Intelligence
    • Managed Detection & Response
      24/7/365 Expert MDR Across Your Entire Environment
    • Incident Readiness & Response
      DFIR, Breach Readiness, & Compromise Assessments
    Support, Deployment, & Health
    • Technical Account Management
      Customer Success with Personalized Service
    • SentinelOne GO
      Guided Onboarding & Deployment Advisory
    • SentinelOne University
      Live and On-Demand Training
    • Services Overview
      Comprehensive Solutions for Seamless Security Operations
    • SentinelOne Community
      Community Login
  • Partners
    Our Network
    • MSSP Partners
      Succeed Faster with SentinelOne
    • Singularity Marketplace
      Extend the Power of S1 Technology
    • Cyber Risk Partners
      Enlist Pro Response and Advisory Teams
    • Technology Alliances
      Integrated, Enterprise-Scale Solutions
    • SentinelOne for AWS
      Hosted in AWS Regions Around the World
    • Channel Partners
      Deliver the Right Solutions, Together
    • SentinelOne for Google Cloud
      Unified, Autonomous Security Giving Defenders the Advantage at Global Scale
    • Partner Locator
      Your Go-to Source for Our Top Partners in Your Region
    Partner Portal→
  • Resources
    Resource Center
    • Case Studies
    • Data Sheets
    • eBooks
    • Reports
    • Videos
    • Webinars
    • Whitepapers
    • Events
    View All Resources→
    Blog
    • Feature Spotlight
    • For CISO/CIO
    • From the Front Lines
    • Identity
    • Cloud
    • macOS
    • SentinelOne Blog
    Blog→
    Tech Resources
    • SentinelLABS
    • Ransomware Anthology
    • Cybersecurity 101
  • About
    About SentinelOne
    • About SentinelOne
      The Industry Leader in Cybersecurity
    • Investor Relations
      Financial Information & Events
    • SentinelLABS
      Threat Research for the Modern Threat Hunter
    • Careers
      The Latest Job Opportunities
    • Press & News
      Company Announcements
    • Cybersecurity Blog
      The Latest Cybersecurity Threats, News, & More
    • FAQ
      Get Answers to Our Most Frequently Asked Questions
    • DataSet
      The Live Data Platform
    • S Foundation
      Securing a Safer Future for All
    • S Ventures
      Investing in the Next Generation of Security, Data and AI
  • Pricing
Get StartedContact Us
CVE Vulnerability Database
Vulnerability Database/CVE-2026-6114

CVE-2026-6114: Totolink A7100RU RCE Vulnerability

CVE-2026-6114 is an OS command injection flaw in Totolink A7100RU router that enables remote code execution. Attackers exploit the setNetworkCfg function to inject malicious commands and gain control.

Published: April 17, 2026

CVE-2026-6114 Overview

A critical OS command injection vulnerability has been identified in the Totolink A7100RU router firmware version 7.4cu.2313_b20191024. The vulnerability exists in the setNetworkCfg function within the CGI handler component (/cgi-bin/cstecgi.cgi). By manipulating the proto argument, remote attackers can inject arbitrary operating system commands, potentially leading to complete device compromise.

Critical Impact

Remote attackers can execute arbitrary commands on the affected router without authentication, potentially gaining full control of the network device and using it as a pivot point for further attacks on the internal network.

Affected Products

  • Totolink A7100RU firmware version 7.4cu.2313_b20191024
  • CGI Handler component (/cgi-bin/cstecgi.cgi)
  • setNetworkCfg function

Discovery Timeline

  • 2026-04-12 - CVE-2026-6114 published to NVD
  • 2026-04-13 - Last updated in NVD database

Technical Details for CVE-2026-6114

Vulnerability Analysis

This vulnerability is classified as CWE-77 (Command Injection), a severe class of security flaws that allows attackers to execute arbitrary commands on the host operating system. The setNetworkCfg function in the Totolink A7100RU router fails to properly sanitize the proto argument before passing it to system-level functions. This lack of input validation enables attackers to append malicious commands that are executed with the privileges of the web server process, typically running as root on embedded devices.

The network-accessible nature of this vulnerability significantly increases its risk, as attackers can exploit it remotely without requiring any prior authentication. The exploit for this vulnerability has been publicly disclosed, making it accessible to a wide range of threat actors.

Root Cause

The root cause of this vulnerability lies in improper input validation within the setNetworkCfg function. The proto parameter is directly incorporated into system commands without proper sanitization or escaping. This is a common vulnerability pattern in embedded router firmware where user-supplied input is concatenated with shell commands and executed via functions like system() or popen().

Attack Vector

The attack is carried out remotely over the network by sending specially crafted HTTP requests to the /cgi-bin/cstecgi.cgi endpoint. The attacker manipulates the proto argument to include shell metacharacters and malicious commands. When the setNetworkCfg function processes this input, the injected commands are executed on the underlying operating system.

Typical exploitation involves appending command separators (such as ;, |, or &&) followed by arbitrary commands to the proto parameter. Since embedded devices typically run with elevated privileges, successful exploitation grants the attacker root-level access to the device, enabling them to modify configurations, intercept network traffic, install persistent backdoors, or pivot to other devices on the network.

For detailed technical information about this vulnerability, refer to the GitHub PoC Repository and VulDB #356974.

Detection Methods for CVE-2026-6114

Indicators of Compromise

  • Unusual HTTP POST requests to /cgi-bin/cstecgi.cgi containing shell metacharacters in the proto parameter
  • Unexpected outbound network connections from the router to unknown IP addresses
  • Modified router configuration files or unauthorized user accounts on the device
  • Suspicious processes running on the router that were not present during normal operation

Detection Strategies

  • Monitor network traffic for HTTP requests to CGI endpoints containing command injection patterns such as ;, |, &&, or backticks in parameter values
  • Implement intrusion detection rules to alert on requests to /cgi-bin/cstecgi.cgi with anomalous proto argument content
  • Deploy network segmentation to isolate IoT devices and monitor traffic flows between segments
  • Use SentinelOne Singularity to detect and alert on command injection attempts targeting network infrastructure

Monitoring Recommendations

  • Enable detailed logging on the router if supported by the firmware
  • Configure network monitoring tools to capture and analyze traffic to the router's management interface
  • Review router logs regularly for evidence of exploitation attempts
  • Implement alerting for any changes to router configuration or firmware

How to Mitigate CVE-2026-6114

Immediate Actions Required

  • Restrict access to the router's web management interface to trusted networks only
  • Implement firewall rules to block external access to port 80/443 on the router management interface
  • Consider disabling the web management interface entirely if not required for operations
  • Monitor for firmware updates from Totolink and apply them immediately when available

Patch Information

At the time of publication, no official patch has been released by Totolink for this vulnerability. Users should monitor the Totolink Official Website for security advisories and firmware updates. Given the public availability of exploit information, organizations should treat this as a high-priority security issue.

Workarounds

  • Place the router behind a separate firewall that blocks direct access to the CGI interface from untrusted networks
  • Configure access control lists (ACLs) to limit which IP addresses can reach the router's management interface
  • If possible, disable remote management entirely and only allow local administration via a physically connected console
  • Consider replacing the affected device with a router from a vendor with a more responsive security update cycle
bash
# Example iptables rules to restrict management interface access
# Apply these on an upstream firewall or the router if supported

# Block all external access to the CGI handler
iptables -A INPUT -p tcp --dport 80 -s ! 192.168.1.0/24 -j DROP
iptables -A INPUT -p tcp --dport 443 -s ! 192.168.1.0/24 -j DROP

# Only allow management from specific trusted IP
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.100 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP

Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.

  • Vulnerability Details
  • TypeRCE

  • Vendor/TechTotolink

  • SeverityHIGH

  • CVSS Score8.9

  • EPSS Probability0.89%

  • Known ExploitedNo
  • CVSS Vector
  • CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  • Impact Assessment
  • ConfidentialityLow
  • IntegrityNone
  • AvailabilityHigh
  • CWE References
  • CWE-77
  • Technical References
  • GitHub PoC Repository

  • VulDB Submission #792247

  • VulDB #356974

  • VulDB #356974 CTI

  • Totolink Official Website
  • Related CVEs
  • CVE-2026-7633: Totolink N300RH RCE Vulnerability

  • CVE-2026-7823: Totolink A8000RU RCE Vulnerability

  • CVE-2026-7721: Totolink WA300 RCE Vulnerability

  • CVE-2026-7718: Totolink WA300 RCE Vulnerability
Default Legacy - Prefooter | Experience the World’s Most Advanced Cybersecurity Platform

Experience the World’s Most Advanced Cybersecurity Platform

See how our intelligent, autonomous cybersecurity platform can protect your organization now and into the future.

Try SentinelOne
  • Get Started
  • Get a Demo
  • Product Tour
  • Why SentinelOne
  • Pricing & Packaging
  • FAQ
  • Contact
  • Contact Us
  • Customer Support
  • SentinelOne Status
  • Language
  • Platform
  • Singularity Platform
  • Singularity Endpoint
  • Singularity Cloud
  • Singularity AI-SIEM
  • Singularity Identity
  • Singularity Marketplace
  • Purple AI
  • Services
  • Wayfinder TDR
  • SentinelOne GO
  • Technical Account Management
  • Support Services
  • Verticals
  • Energy
  • Federal Government
  • Finance
  • Healthcare
  • Higher Education
  • K-12 Education
  • Manufacturing
  • Retail
  • State and Local Government
  • Cybersecurity for SMB
  • Resources
  • Blog
  • Labs
  • Case Studies
  • Videos
  • Product Tours
  • Events
  • Cybersecurity 101
  • eBooks
  • Webinars
  • Whitepapers
  • Press
  • News
  • Ransomware Anthology
  • Company
  • About Us
  • Our Customers
  • Careers
  • Partners
  • Legal & Compliance
  • Security & Compliance
  • Investor Relations
  • S Foundation
  • S Ventures

©2026 SentinelOne, All Rights Reserved.

Privacy Notice Terms of Use

English