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CVE-2019-17621 — The UPnP endpoint URL /gena.cgi in the D-Link DIR-859 Wi-Fi router 1.05 and 1.06B01…

Key facts

CVE-2019-17621 is a Critical (9.8) vulnerability: The UPnP endpoint URL /gena.cgi in the D-Link DIR-859 Wi-Fi router 1.05 and 1.06B01…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2023-06-29), confirming active exploitation in the wild.

Actively exploited — on the CISA KEV catalog

CVE-2019-17621 is listed on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2023-06-29), confirming exploitation in the wild. Federal remediation deadline: 2023-07-20. Prioritise patching and deploy the detection and prevention rules below.
CVE CVE-2019-17621
Severity Critical (9.8)
CISA KEV Actively exploited (added 2023-06-29)
Detection / prevention —
PoC poc.py
Source 2019/CVE-2019-17621/

Details

English | 한국어

Description

The UPnP endpoint URL /gena.cgi in the D-Link DIR-859 Wi-Fi router 1.05 and 1.06B01 Beta01 allows an Unauthenticated remote attacker to execute system commands as root, by sending a specially crafted HTTP SUBSCRIBE request to the UPnP service when connecting to the local network.

Vulnerability Details

Property Value
CVE ID CVE-2019-17621
Type RCE
CVSS Score 9.8

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2019/CVE-2019-17621/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-2019-17621

# 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

  • http://packetstormsecurity.com/files/156054/D-Link-DIR-859-Unauthenticated-Remote-Command-Execution.html
  • https://medium.com/%40s1kr10s/d-link-dir-859-rce-unautenticated-cve-2019-17621-en-d94b47a15104
  • https://medium.com/%40s1kr10s/d-link-dir-859-rce-unautenticated-cve-2019-17621-es-fad716629ff9
  • https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10146
  • https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10147
  • https://www.dlink.com/en/security-bulletin
  • https://www.ftc.gov/system/files/documents/cases/dlink_proposed_order_and_judgment_7-2-19.pdf
  • http://packetstormsecurity.com/files/156054/D-Link-DIR-859-Unauthenticated-Remote-Command-Execution.html
  • https://medium.com/%40s1kr10s/d-link-dir-859-rce-unautenticated-cve-2019-17621-en-d94b47a15104
  • https://medium.com/%40s1kr10s/d-link-dir-859-rce-unautenticated-cve-2019-17621-es-fad716629ff9
  • https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10146
  • https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10147
  • https://www.dlink.com/en/security-bulletin
  • https://www.ftc.gov/system/files/documents/cases/dlink_proposed_order_and_judgment_7-2-19.pdf
  • https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-17621

Generated by PoC Generator on 2026-07-02T00:05:47.401577673

Frequently asked questions

What is CVE-2019-17621?

CVE-2019-17621 is a Critical (9.8) vulnerability: The UPnP endpoint URL /gena.cgi in the D-Link DIR-859 Wi-Fi router 1.05 and 1.06B01…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2023-06-29), confirming active exploitation in the wild.

How do I detect CVE-2019-17621?

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-2019-17621?

Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.

Is CVE-2019-17621 actively exploited?

Yes. CVE-2019-17621 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2023-06-29, which means it has been exploited in the wild. CISA set a federal remediation deadline of 2023-07-20. Prioritise patching and deploy the detection and prevention rules above.

For authorized security testing and research only. See the full source and NVD record.