CVE-2024-6221

Publication date 18 August 2024

Last updated 3 July 2025

Ubuntu priority

Cvss 3 Severity Score

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

Status

Show unmaintained releases

Package	Ubuntu Release	Status
python-flask-cors	25.04 plucky	Not affected
	24.10 oracular	Fixed 4.0.1-1ubuntu0.1
	24.04 LTS noble	Fixed 4.0.0-1ubuntu0.1~esm1
	22.04 LTS jammy	Fixed 3.0.9-2ubuntu0.1
	20.04 LTS focal	Fixed 3.0.8-2ubuntu0.1+esm1

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
python-flask-cors	Upstream: 7ae310c Upstream: c851476

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

References

Related Ubuntu Security Notices (USN)

USN-7612-1
Flask-CORS vulnerabilities
2 July 2025