CVE-2020-21238

Name: CVE-2020-21238
Creator: NVD / NIST
Published: 2021-12-27T23:15:08.08+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.94%

Last modified Jun 17, 2026

CVE-2020-21238 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue in the user login box of CSCMS v4.0 allows attackers to hijack user accounts via brute force attacks.. EPSS estimates a 0.94% chance of exploitation in the next 30 days.

Description

An issue in the user login box of CSCMS v4.0 allows attackers to hijack user accounts via brute force attacks.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

0.94%

56.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-307

Affected Software

Vendor	Product	Versions
Chshcms	Cscms	4.0

References

https://github.com/chshcms/cscms/issues/5Exploit, Issue Tracking, Third Party Advisory
https://github.com/chshcms/cscms/issues/5Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Dec 27, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-21238?

An issue in the user login box of CSCMS v4.0 allows attackers to hijack user accounts via brute force attacks.

How severe is CVE-2020-21238?

CVE-2020-21238 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.94% probability of exploitation in the next 30 days.

How do I fix CVE-2020-21238?

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-2020-21238?

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

Scan your code now

Source: NVD / NIST