CVE-2026-79911 — A security vulnerability has been detected in TOTOLINK N600R 4.3.0cu.7647_B20210106.¶
Key facts
CVE-2026-79911 is a Critical (10.0) vulnerability: A security vulnerability has been detected in TOTOLINK N600R 4.3.0cu.7647_B20210106.. This entry ships a detection-only PoC and a Docker test lab.
| CVE | CVE-2026-79911 |
| Severity | Critical (10.0) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2026/CVE-2026-79911/ |
Details¶
English | 한국어
Description¶
A security vulnerability has been detected in TOTOLINK N600R 4.3.0cu.7647_B20210106. The affected element is the function setSystemConfig of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument Hostname leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2026-79911 |
| CVSS Score | 10.0 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-79911/poc.py
Usage¶
# Run PoC against target
python3 poc.py --target <TARGET_URL>
# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>
⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.
Test Lab¶
This repository includes a Docker-based test environment with both vulnerable and patched applications.
Quick Start¶
# Clone and navigate to CVE directory
cd CVE-2026-79911
# Start both applications
docker-compose up -d
# Run tests
./run-tests.sh # Linux/Mac
./run-tests.ps1 # Windows PowerShell
Application Endpoints¶
| Application | URL | Status |
|---|---|---|
| Vulnerable App | http://localhost:8080 | Shows vulnerability |
| Patched App | http://localhost:8081 | Demonstrates fix |
Directory Structure¶
├── README.md # English documentation
├── README_KO.md # Korean documentation
├── poc.py # PoC detection script
├── docker-compose.yml # Container orchestration
├── run-tests.sh # Linux/Mac test runner
├── run-tests.ps1 # Windows test runner
├── vulnerable-app/ # Vulnerable version
│ ├── app.py
│ ├── Dockerfile
│ └── requirements.txt
└── patched-app/ # Fixed version
├── app.py
├── Dockerfile
└── requirements.txt
References¶
- https://github.com/dxz0069/WAVLINK-WN530H4-Command-Injection-in-set_add_routing/blob/main/TOTOLINK_N600R_cstecgi_strcpy_sprintf_Multi_Function_Stack_Overflow.md
- https://vuldb.com/cve/CVE-2026-79911
- https://vuldb.com/submit/881258
- https://vuldb.com/vuln/395061
- https://vuldb.com/vuln/395061/cti
- https://www.totolink.net/
Generated by PoC Generator on 2026-08-26T10:14:26.398278893
Frequently asked questions¶
What is CVE-2026-79911?¶
CVE-2026-79911 is a Critical (10.0) vulnerability: A security vulnerability has been detected in TOTOLINK N600R 4.3.0cu.7647_B20210106.. This entry ships a detection-only PoC and a Docker test lab.
How do I detect CVE-2026-79911?¶
Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.
How do I block or mitigate CVE-2026-79911?¶
Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.
For authorized security testing and research only. See the full source and NVD record.