# Authentication bypass in Apache Airflow

Advisory record · `GHSA-hhx9-p69v-cx2j`

- **Identifiers:** `GHSA-hhx9-p69v-cx2j` · `BIT-airflow-2020-13927` · `CVE-2020-13927` · `PYSEC-2020-18`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: KEV, CVSS 9+, CVSS 7+ and EPSS
- **Weakness (CWE):** [CWE-287](https://cwe.mitre.org/data/definitions/287.html) · [CWE-306](https://cwe.mitre.org/data/definitions/306.html) · [CWE-1056](https://cwe.mitre.org/data/definitions/1056.html) · [CWE-1188](https://cwe.mitre.org/data/definitions/1188.html)
- **Tags:** [Authentication bypass](https://agentprime.io/advisories/tag/auth-bypass.md) · [CWE-1056](https://agentprime.io/advisories/tag/cwe-1056.md) · [CWE-1188](https://agentprime.io/advisories/tag/cwe-1188.md)
- **Published:** 30 Apr 2021
- **Updated:** 22 Oct 2025
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 30 Apr 2021, 17:34 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- In CISA’s KEV catalogue since 18 Jan 2022: it is known to be exploited.
- CVSS score 9.8: 9.0 or more.
- CVSS score 9.8 (7.0 or more) and EPSS 1.00 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `apache-airflow` (PyPI): affected `<1.10.11`; fixed in `1.10.11`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 9.8 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H`, from GitHub Advisory Database

- **CISA KEV:** Listed since 18 Jan 2022: known to be exploited.
- **EPSS:** 1.00, the 99th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 30 Apr 2021. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-hhx9-p69v-cx2j](https://github.com/advisories/GHSA-hhx9-p69v-cx2j)
- [OSV: GHSA-hhx9-p69v-cx2j](https://osv.dev/vulnerability/GHSA-hhx9-p69v-cx2j)
- <https://nvd.nist.gov/vuln/detail/CVE-2020-13927>
- <https://github.com/apache/airflow/pull/9611>
- <https://github.com/apache/airflow/commit/180bca4f993b7b778a8d2c65d3d357652218922b>
- <https://github.com/apache/airflow/commit/9e305d6b810a2a21e2591a80a80ec41acb3afed0>
- <https://airflow.apache.org/docs/apache-airflow/1.10.11/security.html#api-authentication>
- <https://github.com/advisories/GHSA-hhx9-p69v-cx2j>
- <https://github.com/apache/airflow>
- <https://github.com/apache/airflow/releases/tag/1.10.11>
- <https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2020-18.yaml>
- <https://lists.apache.org/thread.html/r23a81b247aa346ff193670be565b2b8ea4b17ddbc7a35fc099c1aadd%40%3Cdev.airflow.apache.org%3E>
- <https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-13927>
- <http://packetstormsecurity.com/files/162908/Apache-Airflow-1.10.10-Remote-Code-Execution.html>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-hhx9-p69v-cx2j>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-hhx9-p69v-cx2j/>. Everything for agents: <https://agentprime.io/llms.txt>.