# CVE-2020-25032: Flask-Cors Directory Traversal vulnerability

Source: https://junglewise.ai/threats/cve-2020-25032-flask-cors-directory-traversal-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2020-08-31  
License: CC BY 4.0 with a link back

CVE-2020-25032 · Severity: low · CVSS 3.1 · Published 2020-08-31

An issue was discovered in Flask-CORS (aka CORS Middleware for Flask) before 3.0.9. It allows ../ directory traversal to access private resources because resource matching does not ensure that pathnames are in a canonical format.

Technologies: [Flask-Cors (PyPI)](https://junglewise.ai/threats/technologies/flask-cors). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2020-25032 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2020-25032 being exploited in the wild.

**How severe is CVE-2020-25032?** Low severity, with a CVSS score of 3.1, published 31 August 2020.

**Which products and versions are affected?** Flask-Cors (PyPI) ECOSYSTEM:introduced=0,fixed=3.0.9.

**Is there a fix for CVE-2020-25032?** Yes. Flask-Cors (PyPI): upgrade to 3.0.9 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2020-25032?** Check whether you run Flask-Cors (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Flask-Cors (PyPI): upgrade to 3.0.9 or later

  ```sh
  pip install "Flask-Cors>=3.0.9"
  ```


## Affected products

- Flask-Cors (PyPI) ECOSYSTEM:introduced=0,fixed=3.0.9

## Identifiers

- CVE-2020-25032
- GHSA-xc3p-ff3m-f46v
- PYSEC-2020-43

## Related threats

- [PYSEC-2026-1385 - Flask-CORS allows for inconsistent CORS matching](https://junglewise.ai/threats/cve-2024-6844-flask-cors-allows-for-inconsistent-cors-matching)
- [PYSEC-2026-1384 - Flask-CORS improper regex path matching vulnerability](https://junglewise.ai/threats/cve-2024-6839-flask-cors-improper-regex-path-matching-vulnerability)
- [PYSEC-2026-1383 - Flask-CORS vulnerable to Improper Handling of Case Sensitivity](https://junglewise.ai/threats/cve-2024-6866-flask-cors-vulnerable-to-improper-handling-of-case-sensitivity)
- [Flask-Cors improper access control in Private Network Access header](https://junglewise.ai/threats/cve-2024-6221-flask-cors-improper-access-control-in-private-network-access)
- [corydolphin flask-cors log injection in debug mode](https://junglewise.ai/threats/cve-2024-1681-corydolphin-flask-cors-log-injection-in-debug-mode)