How to fix CVE-2024-6844?

Within 30 days: Identify affected systems running corydolphin/flask-cors and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Is Python affected by CVE-2024-6844?

Organizations using corydolphin/flask-cors should be aware of moderate risk from CVE-2024-6844 rated CVSS 5.3. Exploitation could compromise the security of affected deployments. Proof-of-concept code is publicly available.

CVE-2024-6844

MEDIUM

2025-03-20 [email protected]

5.3

CVSS 3.0

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Lifecycle Timeline

Patch Released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 28, 2026 - 18:32 vuln.today

PoC Detected

Nov 03, 2025 - 20:17 vuln.today

Public exploit code

CVE Published

Mar 20, 2025 - 10:15 nvd

MEDIUM 5.3

Description

A vulnerability in corydolphin/flask-cors version 4.0.1 allows for inconsistent CORS matching due to the handling of the '+' character in URL paths. The request.path is passed through the unquote_plus function, which converts the '+' character to a space ' '. This behavior leads to incorrect path normalization, causing potential mismatches in CORS configuration. As a result, endpoints may not be matched correctly to their CORS settings, leading to unexpected CORS policy application. This can cause unauthorized cross-origin access or block valid requests, creating security vulnerabilities and usability issues.

Analysis

A vulnerability in corydolphin/flask-cors version 4.0.1 allows for inconsistent CORS matching due to the handling of the '+' character in URL paths. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical Context

This vulnerability is classified under CWE-346. A vulnerability in corydolphin/flask-cors version 4.0.1 allows for inconsistent CORS matching due to the handling of the '+' character in URL paths. The request.path is passed through the unquote_plus function, which converts the '+' character to a space ' '. This behavior leads to incorrect path normalization, causing potential mismatches in CORS configuration. As a result, endpoints may not be matched correctly to their CORS settings, leading to unexpected CORS policy application. This can cause unauthorized cross-origin access or block valid requests, creating security vulnerabilities and usability issues. Affected products include: Flask-Cors Project Flask-Cors. Version information: version 4.0.1.

Affected Products

Flask-Cors Project Flask-Cors.

Remediation

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.1

CVSS: +26

POC: +20

Vendor Status

CVE-2024-6844 vulnerability details – vuln.today

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CVE-2024-6844

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CVE-2024-6844

CVSS Vector

Lifecycle Timeline

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Description

Analysis

Technical Context

Affected Products

Remediation

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External POC / Exploit Code