What’s Vulnerable › Vulnerabilities

CVE-2020-25032

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-08-31 · updated 2026-06-17
• Weakness: CWE-22

Description

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.

Affected products

• Debian Linux: 10.0
• corydolphin/flask-cors: before 3.0.9 — fixed in 3.0.9
• openSUSE Backports Sle: 15.0-sp1, 15.0-sp2
• openSUSE Leap: 15.1, 15.2

How to fix

Upgrade to a fixed version: corydolphin/flask-cors 3.0.9. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00028.html
• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00032.html
• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00039.html
• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00048.html
• https://github.com/corydolphin/flask-cors/releases/tag/3.0.9
• https://www.debian.org/security/2020/dsa-4775
• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00028.html
• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00032.html
• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00039.html
• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00048.html
• https://github.com/corydolphin/flask-cors/releases/tag/3.0.9
• https://www.debian.org/security/2020/dsa-4775

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