CVE-2021-32838

Name: CVE-2021-32838
Creator: NVD / NIST
Published: 2021-09-20T18:15:11.01+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.80%

Last modified Jun 17, 2026

CVE-2021-32838 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Flask-RESTX (pypi package flask-restx) is a community driven fork of Flask-RESTPlus. Flask-RESTX before version 0.5.1 is vulnerable to ReDoS (Regular Expression Denial of Service) in email_regex. EPSS estimates a 1.80% chance of exploitation in the next 30 days.

Description

Flask-RESTX (pypi package flask-restx) is a community driven fork of Flask-RESTPlus. Flask-RESTX before version 0.5.1 is vulnerable to ReDoS (Regular Expression Denial of Service) in email_regex. This is fixed in version 0.5.1.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.80%

75.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Flask-Restx Project	Flask-Restx	< 0.5.1
Fedoraproject	Fedora	33
Fedoraproject	Fedora	34

References

https://github.com/advisories/GHSA-3q6g-vf58-7m4gThird Party Advisory
https://github.com/python-restx/flask-restx/blob/fd99fe11a88531f5f3441a278f7020589f9d2cc0/flask_restx/inputs.py#L51Patch, Third Party Advisory
https://github.com/python-restx/flask-restx/commit/bab31e085f355dd73858fd3715f7ed71849656daPatch, Third Party Advisory
https://github.com/python-restx/flask-restx/issues/372Issue Tracking, Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5UCTFVDU3677B5OBGK4EF5NMUPJLL6SQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QUD6SWZLX52AAZUHDETJ2CDMQGEPGFL3/
https://pypi.org/project/flask-restx/Product, Third Party Advisory
https://github.com/advisories/GHSA-3q6g-vf58-7m4gThird Party Advisory
https://github.com/python-restx/flask-restx/blob/fd99fe11a88531f5f3441a278f7020589f9d2cc0/flask_restx/inputs.py#L51Patch, Third Party Advisory
https://github.com/python-restx/flask-restx/commit/bab31e085f355dd73858fd3715f7ed71849656daPatch, Third Party Advisory
https://github.com/python-restx/flask-restx/issues/372Issue Tracking, Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5UCTFVDU3677B5OBGK4EF5NMUPJLL6SQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QUD6SWZLX52AAZUHDETJ2CDMQGEPGFL3/
https://pypi.org/project/flask-restx/Product, Third Party Advisory

Timeline

Published: Sep 20, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-32838?

How severe is CVE-2021-32838?

CVE-2021-32838 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.80% probability of exploitation in the next 30 days.

How do I fix CVE-2021-32838?

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-2021-32838?

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

Scan your code now

Source: NVD / NIST