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.

The remote Ubuntu 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 / 25.04 host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-7612-1 advisory.

    It was discovered that Flask-CORS did not correctly handle certain regular expressions. A remote attacker     could possibly use this issue to leak sensitive information or bypass authentication mechanisms.
    (CVE-2024-6839) It was discovered that Flask-CORS allowed certain CORS headers to be enabled by default. A     remote attacker could possibly use this issue to leak sensitive information. This issue only affected     Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and Ubuntu 24.10. (CVE-2024-6221)

    It was discovered that Flask-CORS did not correctly handle case sensitivity when matching paths. A remote     attacker could possibly use this issue to leak sensitive information. (CVE-2024-6866)

    It was discovered that Flask-CORS did not correctly handle certain characters in URL paths. A remote     attacker could possibly use this issue to leak sensitive information or bypass authentication mechanisms.
    (CVE-2024-6844)

    Elias Hohl was discovered that Flask-CORS did not correctly sanitize log entries. A remote attacker could     possibly use this issue to corrupt log files. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS     and Ubuntu 24.04 LTS. (CVE-2024-1681)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2024-6221)

ID	Name	Product	Family	Type	Severity
241350	Ubuntu 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 / 25.04 : Flask-CORS vulnerabilities (USN-7612-1)	Nessus	Ubuntu Local Security Checks	Local	high
421343	SCA: security update for Flask-Cors (GHSA-hxwh-jpp2-84pm)	Tenable Cloud Security	SCA Checks	Local	high
421343	SCA: security update for Flask-Cors (GHSA-hxwh-jpp2-84pm)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2024-6221

high

Tenable Plugins

high

high

high