GHSA-HHX9-P69V-CX2J
Vulnerability from github – Published: 2021-04-30 17:34 – Updated: 2025-10-22 17:56
VLAI
Summary
Authentication bypass in Apache Airflow
Details
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
Severity
9.8 (Critical)
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "apache-airflow"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.10.11"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2020-13927"
],
"database_specific": {
"cwe_ids": [
"CWE-1056",
"CWE-1188",
"CWE-287",
"CWE-306"
],
"github_reviewed": true,
"github_reviewed_at": "2021-04-20T19:30:46Z",
"nvd_published_at": "2020-11-10T16:15:00Z",
"severity": "CRITICAL"
},
"details": "The previous default setting for Airflow\u0027s 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",
"id": "GHSA-hhx9-p69v-cx2j",
"modified": "2025-10-22T17:56:14Z",
"published": "2021-04-30T17:34:13Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-13927"
},
{
"type": "WEB",
"url": "https://github.com/apache/airflow/pull/9611"
},
{
"type": "WEB",
"url": "https://github.com/apache/airflow/commit/180bca4f993b7b778a8d2c65d3d357652218922b"
},
{
"type": "WEB",
"url": "https://github.com/apache/airflow/commit/9e305d6b810a2a21e2591a80a80ec41acb3afed0"
},
{
"type": "WEB",
"url": "https://airflow.apache.org/docs/apache-airflow/1.10.11/security.html#api-authentication"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-hhx9-p69v-cx2j"
},
{
"type": "PACKAGE",
"url": "https://github.com/apache/airflow"
},
{
"type": "WEB",
"url": "https://github.com/apache/airflow/releases/tag/1.10.11"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2020-18.yaml"
},
{
"type": "WEB",
"url": "https://lists.apache.org/thread.html/r23a81b247aa346ff193670be565b2b8ea4b17ddbc7a35fc099c1aadd%40%3Cdev.airflow.apache.org%3E"
},
{
"type": "WEB",
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-13927"
},
{
"type": "WEB",
"url": "http://packetstormsecurity.com/files/162908/Apache-Airflow-1.10.10-Remote-Code-Execution.html"
},
{
"type": "WEB",
"url": "http://packetstormsecurity.com/files/174764/Apache-Airflow-1.10.10-Remote-Code-Execution.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H",
"type": "CVSS_V3"
},
{
"score": "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:A",
"type": "CVSS_V4"
}
],
"summary": "Authentication bypass in Apache Airflow"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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