Critical
Security advisory
The variable import endpoint was not protected by authentication in Airflow >=2.0.0, <2.1.3. This allowed unauthenticated users to hit that endpoint to add/modify Airflow variables used in DAGs, potentially resulting in a denial of service, information disclosure or remote code execution. This issue affects Apache Airflow >=2.0.0, <2.1.3.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-38540
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 06:28 UTC · Revision 1
Source evidence
The variable import endpoint was not protected by authentication in Airflow >=2.0.0, <2.1.3. This allowed unauthenticated users to hit that endpoint to add/modify Airflow variables used in DAGs, potentially resulting in a denial of service, information disclosure or remote code execution. This issue affects Apache Airflow >=2.0.0, <2.1.3.
osv:CVE-2021-38540
Complete source record
{
"id": "56f57c3bd422c4b6146fa9e62bcf18778ce052c2891b20dfac7378a36eb01543",
"url": "https://osv.dev/vulnerability/CVE-2021-38540",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-38540",
"summary": "The variable import endpoint was not protected by authentication in Airflow >=2.0.0, <2.1.3. This allowed unauthenticated users to hit that endpoint to add/modify Airflow variables used in DAGs, potentially resulting in a denial of service, information disclosure or remote code execution. This issue affects Apache Airflow >=2.0.0, <2.1.3.",
"evidence": "osv:CVE-2021-38540",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2021-38540",
"aliases": [
"BIT-airflow-2021-38540",
"CVE-2021-38540",
"GHSA-h88f-r7cw-8fv3",
"PYSEC-2021-326"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/apache/airflow",
"type": "GIT",
"events": [
{
"introduced": "8217db8cb4b1ff302c5cf8662477ac00f701e78c"
},
{
"fixed": "d7dbfb7e26a50130d3550e781dc71a5fbcaeb3d2"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.0.0"
},
{
"fixed": "2.1.3"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-38540.json"
}
}
],
"modified": "2026-10-24T10:30:39.971722591Z",
"provider": "osv",
"references": [
"https://lists.apache.org/thread.html/rac2ed9118f64733e47b4f1e82ddc8c8020774698f13328ca742b03a2%40%3Cannounce.apache.org%3E",
"https://lists.apache.org/thread.html/rb34c3dd1a815456355217eef34060789f771b6f77c3a3dec77de2064%40%3Cusers.airflow.apache.org%3E"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2021-38540",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 434803,
"published_at": "2021-09-09T15:15:09.17+00:00"
}