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CVE-2020-13927 — The previous default setting for Airflow's Experimental API was to allow all API requests…

Key facts

CVE-2020-13927 is a Critical (9.8) vulnerability: The previous default setting for Airflow's Experimental API was to allow all API requests…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2022-01-18), confirming active exploitation in the wild.

Actively exploited — on the CISA KEV catalog

CVE-2020-13927 is listed on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2022-01-18), confirming exploitation in the wild. Federal remediation deadline: 2022-07-18. Prioritise patching and deploy the detection and prevention rules below.
CVE CVE-2020-13927
Severity Critical (9.8)
CISA KEV Actively exploited (added 2022-01-18)
Detection / prevention —
PoC poc.py
Source 2020/CVE-2020-13927/

Details

English | 한국어

Description

The previous default setting for Airflow's Experimental API was to allow all API requests without authentication, but this poses security risks to users who miss this fact. From Airflow 1.10.11 the default has been changed to deny all requests by default and is documented at https://airflow.apache.org/docs/1.10.11/security.html#api-authentication. Note this change fixes it for new installs but existing users need to change their config to default [api]auth_backend = airflow.api.auth.backend.deny_all as mentioned in the Updating Guide: https://github.com/apache/airflow/blob/1.10.11/UPDATING.md#experimental-api-will-deny-all-request-by-default

Vulnerability Details

Property Value
CVE ID CVE-2020-13927
CVSS Score 9.8

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2020/CVE-2020-13927/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-2020-13927

# 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/162908/Apache-Airflow-1.10.10-Remote-Code-Execution.html
  • http://packetstormsecurity.com/files/174764/Apache-Airflow-1.10.10-Remote-Code-Execution.html
  • https://lists.apache.org/thread.html/r23a81b247aa346ff193670be565b2b8ea4b17ddbc7a35fc099c1aadd%40%3Cdev.airflow.apache.org%3E
  • http://packetstormsecurity.com/files/162908/Apache-Airflow-1.10.10-Remote-Code-Execution.html
  • http://packetstormsecurity.com/files/174764/Apache-Airflow-1.10.10-Remote-Code-Execution.html
  • https://lists.apache.org/thread.html/r23a81b247aa346ff193670be565b2b8ea4b17ddbc7a35fc099c1aadd%40%3Cdev.airflow.apache.org%3E
  • https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-13927

Generated by PoC Generator on 2026-07-01T04:41:29.429630067

Frequently asked questions

What is CVE-2020-13927?

CVE-2020-13927 is a Critical (9.8) vulnerability: The previous default setting for Airflow's Experimental API was to allow all API requests…. This entry ships a detection-only PoC and a Docker test lab. It is on the CISA Known Exploited Vulnerabilities (KEV) catalog (added 2022-01-18), confirming active exploitation in the wild.

How do I detect CVE-2020-13927?

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-2020-13927?

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-2020-13927 actively exploited?

Yes. CVE-2020-13927 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2022-01-18, which means it has been exploited in the wild. CISA set a federal remediation deadline of 2022-07-18. Prioritise patching and deploy the detection and prevention rules above.

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