CVE-2021-26697Network attack vector

Metadata disclosure via unauthenticated lineage endpoint

Published Feb 17, 2021 · Updated Feb 13, 2025

Missing authentication in Apache Airflow 2.0.0 allows remote attackers to read DAG and task lineage metadata through the Experimental API. The get_lineage route in airflow/www/api/experimental/endpoints.py omits the requires_authentication decorator before processing attacker-supplied DAG and execution-date path parameters. Exploitation requires the deprecated API to be enabled and knowledge of valid parameters; the result is limited to DAG and task metadata disclosure.

CVSS severity5.3
Medium
EPSS probability4.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Apache Airflow 2.0.0 allows remote attackers to read DAG and task lineage metadata through the Experimental API. The get_lineage route in airflow/www/api/experimental/endpoints.py omits the requires_authentication decorator before processing attacker-supplied DAG and execution-date path parameters. Exploitation requires the deprecated API to be enabled and knowledge of valid parameters; the result is limited to DAG and task metadata disclosure.

The record

CVE
CVE-2021-26697
Published
Feb 17, 2021
Updated
Feb 13, 2025
Vendor
The Apache Software Foundation
Product
Apache Airflow
Classifications
CWE-306, CWE-269, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 17, 2021CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Apache Airflow 2.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Airflowversion=Apache Airflow 2.0.0

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CWE-269Improper Privilege Management
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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