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CVE-2021-38540— Apache Airflow: Variable Import endpoint missed authentication check

Quick assessment

Affected
Apache Software Foundation Apache Airflow
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Airflow是美国阿帕奇（Apache）基金会的一套用于创建、管理和监控工作流程的开源平台。该平台具有可扩展和动态监控等特点。 Apache Airflow 中存在授权问题漏洞，该漏洞源于产品的import端点缺少授权保护。攻击者可通过该漏洞在DAG中添加或修改变量导致拒绝服务、信息泄露或代码执行。以下产品及版本受到影响：Apache Airflow 2.0.0 版本至 2.1.2版本。

AI Predicted 9.8 Difficulty: Trivial EPSS 80.94% · P100

Public Exploits 1

Nuclei · 1 CVE-2021-38540.yaml [template]

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-38540

Vulnerability Information
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Vulnerability Title
Apache Airflow: Variable Import endpoint missed authentication check
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Airflow 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Airflow是美国阿帕奇（Apache）基金会的一套用于创建、管理和监控工作流程的开源平台。该平台具有可扩展和动态监控等特点。 Apache Airflow 中存在授权问题漏洞，该漏洞源于产品的import端点缺少授权保护。攻击者可通过该漏洞在DAG中添加或修改变量导致拒绝服务、信息泄露或代码执行。以下产品及版本受到影响：Apache Airflow 2.0.0 版本至 2.1.2版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Airflow Apache Airflow ~ 2.1.3 -

II. Public POCs for CVE-2021-38540

# POC Description Source Link Shenlong Link
1 Missing Authentication on Critical component CVE-2021-38540 https://github.com/Captain-v-hook/PoC-for-CVE-2021-38540- POC Details
2 Apache Airflow Airflow >=2.0.0 and <2.1.3 does not protect the variable import endpoint which allows 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. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-38540.yaml POC Details
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III. Intelligence Information for CVE-2021-38540

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Mailing List Discussions for CVE-2021-38540 (2)

Same Patch Batch · Apache Software Foundation · 2021-09-09 · 3 CVEs total

CVE-2021-37579 Bypass deserialization checks in Apache Dubbo
CVE-2021-36161 Unprotected input value toString cause RCE

IV. Related Vulnerabilities

Same product: Apache Airflow
Same vendor: Apache Software Foundation
Same weakness: CWE-269

V. Comments for CVE-2021-38540

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