# CVE-2024-6221: python3-flask-cors: A vulnerability in corydolphin/flask-cors version 4.0.1 allows the`Access-Control-Allow-Private-Network` CORS header...

CVE-2024-6221 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2024-6221, released August 18, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2024-6221
- Priority: High
- CVSS: 7.5 (Medium)
- EPSS: 0.0072
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 18, 2024

## Description

A vulnerability in corydolphin/flask-cors version 4.0.1 allows the`Access-Control-Allow-Private-Network` CORS header to be set to true bydefault. This behavior can expose private network resources to unauthorizedexternal access, leading to significant security risks such as databreaches, unauthorized access to sensitive information, and potentialnetwork intrusions.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python-flask-cors Debian 13.5 (trixie) | 5.0.0-1 | [DEBIAN-CVE-2024-6221](https://patchblox.com/security/data/fix/linux/debian-cve-2024-6221.md) | Aug 18, 2024 |
| Linux | python-flask-cors Debian 14 | 5.0.0-1 | [DEBIAN-CVE-2024-6221](https://patchblox.com/security/data/fix/linux/debian-cve-2024-6221.md) | Aug 18, 2024 |
| Linux | python3-flask-cors Ubuntu 20.04 LTS (focal) | 3.0.8-2ubuntu0.1+esm1 | [python3-flask-cors 3.0.8-2ubuntu0.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python3-flask-cors-3.0.8-2ubuntu0.1-esm1.md) | Mar 20, 2025 |
| Linux | python3-flask-cors Ubuntu 22.04.1 LTS (jammy) | 3.0.9-2ubuntu0.1 | [python3-flask-cors 3.0.9-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-python3-flask-cors-3.0.9-2ubuntu0.1.md) | Mar 20, 2025 |
| Linux | python3-flask-cors Ubuntu 24.04.5 LTS (noble) | 4.0.0-1ubuntu0.1~esm1 | [python3-flask-cors 4.0.0-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-python3-flask-cors-4.0.0-1ubuntu0.1-esm1.md) | Mar 20, 2025 |
| Linux | python3-flask-cors Ubuntu 24.10 (oracular) | 4.0.1-1ubuntu0.1 | [python3-flask-cors 4.0.1-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-python3-flask-cors-4.0.1-1ubuntu0.1.md) | Jan 16, 2026 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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