CVE-2020-25032

Name: CVE-2020-25032
Creator: NVD / NIST
Published: 2020-08-31T04:15:12.06+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 4.02%

Last modified Jun 17, 2026

CVE-2020-25032 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 4.02% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

4.02%

89.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions	Update
Flask-Cors Project	Flask-Cors	< 3.0.9	—
Debian	Debian Linux	10.0	—
Opensuse	Backports Sle	15.0	Sp1
Opensuse	Leap	15.1	—
Opensuse	Leap	15.2	—

References

http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00028.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00032.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00039.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00048.htmlMailing List, Third Party Advisory
https://github.com/corydolphin/flask-cors/releases/tag/3.0.9Third Party Advisory
https://www.debian.org/security/2020/dsa-4775Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00028.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00032.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00039.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00048.htmlMailing List, Third Party Advisory
https://github.com/corydolphin/flask-cors/releases/tag/3.0.9Third Party Advisory
https://www.debian.org/security/2020/dsa-4775Third Party Advisory

Timeline

Published: Aug 31, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-25032?

How severe is CVE-2020-25032?

CVE-2020-25032 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 4.02% probability of exploitation in the next 30 days.

How do I fix CVE-2020-25032?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-25032?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST