How severe is CVE-2021-45229?

CVE-2021-45229 has a CVSS score of 6.1/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2021-45229?

CVE-2021-45229 affects the following packages: apache-airflow (PyPI). Ecosystems affected: PyPI.

How do I fix CVE-2021-45229?

Update apache-airflow to 2.2.4rc1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-45229 is resolved across your whole dependency graph.

How do I detect CVE-2021-45229 in my PyPI dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for apache-airflow, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2021-45229 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2021-45229 actively exploited in the wild?

No public exploit code has been indexed for CVE-2021-45229 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2021-45229?

CVE-2021-45229 has an EPSS (Exploit Prediction Scoring System) score of 2.6%, placing it in the 85th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2021-45229?

CVE-2021-45229 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2021-45229 published, and has it been updated?

CVE-2021-45229 was published on February 25, 2022 and was last updated on August 7, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐍

🐍 PyPI

Not in CISA KEV

MEDIUM severity

CVE-2021-45229 — apache-airflow

MEDIUMFix: apache/airflow@628aa1f

CVE-2021-45229 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in apache-airflow. A fix is available for apache-airflow — see the affected versions and patch details below.

Apache Airflow Cross-site Scripting Vulnerability

Also known asBIT-airflow-2021-45229GHSA-65xw-pcqw-hjrhPYSEC-2022-29

Published

Feb 25, 2022

Updated

Aug 7, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Oct 13, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

2.6%probability of exploitation in next 30 days

Lower Risk+0.04%

Lower risk than most CVEs85th percentile — riskier than 85% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2021-45229 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected

🐍apache-airflow

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

It was discovered that the "Trigger DAG with config" screen was susceptible to XSS attacks via the origin query argument. This issue affects Apache Airflow versions 2.2.3 and below.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`apache-airflow`	all versions	2.2.4rc1`pip install --upgrade 'apache-airflow==2.2.4rc1'`

Affected Products

1 product · 1 configurations

Application

airflowapache

≤ 2.2.3

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for apache-airflow, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update apache-airflow to 2.2.4rc1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-45229 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

It was discovered that the "Trigger DAG with config" screen was susceptible to XSS attacks via the `origin` query argument. This issue affects Apache Airflow versions 2.2.3 and below.

O3 Security · Impact-Aware SCA

Is CVE-2021-45229 in your dependencies?

Find it across PyPI, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.1/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

No known public exploit tooling found.

OpenSSF Scorecard

Package health score

airflow

7.8/10

Code-Review10/10

Maintained10/10

Branch-Protection6/10

Assessed Oct 12, 2026

Timeline

Disclosed

Feb 25, 2022

Last updated

Aug 7, 2026

Identifiers

CVE-2021-45229

GHSA-65xw-pcqw-hjrh

BIT-airflow-2021-45229

PYSEC-2022-29

References

Advisorylists.apache.org Advisorynvd.nist.gov Advisorygithub.com Webgithub.com Webgithub.com Packagegithub.com

Related vulnerabilities

This CVE is medium severity; 8 of 8 other CVEs affecting apache-airflow are rated as high or higher (top: critical).

CVE-2026-49487CVE-2026-33264CVE-2026-48891CVE-2026-49296CVE-2026-48828CVE-2026-48892CVE-2026-45192CVE-2026-45360

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedAug 7, 2026