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CVE-2020-13927

CRITICAL9.8
CISA KEV

Published 2020-11-10 · Updated 2026-06-17 · Source security@apache.org

Summary

CVE-2020-13927 is a critical-severity (CVSS 9.8) vulnerability in Apache Airflow's Experimental API. CISA added it to the Known Exploited Vulnerabilities catalog on January 18, 2022, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by July 18, 2022. CISA does not currently list it as used in ransomware campaigns. Apache has 41 vulnerabilities in the KEV catalog, 8 of them linked to ransomware.

All 41 known-exploited Apache vulnerabilities →

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

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-306CWE-1188CWE-306CWE-1056CWE-1188

CISA Known-Exploited Vulnerability

Product: Apache — Airflow's Experimental API

Name: Apache Airflow's Experimental API Authentication Bypass

Date added: 2022-01-18 · Due: 2022-07-18

Required action: Apply updates per vendor instructions.

References

View on NVD